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Position measurement

Subclass of:

702 - Data processing: measuring, calibrating, or testing

702085000 - CALIBRATION OR CORRECTION SYSTEM

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Class / Patent application numberDescriptionNumber of patent applications / Date published
702095000 Coordinate positioning 69
Entries
DocumentTitleDate
20130211763METHOD FOR CHECKING POSITION DATA OF A MEDICAL INSTRUMENT, AND CORRESPONDING MEDICAL INSTRUMENT - A method for checking situation and position data of an instrument with at least a first section having at least a first sensor and at least a second sensor. The method encompasses the metrological determination of the situation or position, or its change, of the first sensor and the second sensor, determining a variable feature of the spatial reference between the situation or position of the first sensor and the situation or position of the second sensor at least at a first point in time, at a second point in time and at a third point in time. The method further encompasses determining, by means of a criterion, whether a difference of the variable feature between a first expression at a first point in time and a second expression at a second point in time still exists at a third point in time.08-15-2013
20100076709Machine sensor calibration system - A sensor calibration system for a mobile machine is disclosed. The sensor calibration system may have a first calibration object positioned at a first worksite location, a second calibration object positioned at a second worksite location, and a plurality of sensors located onboard the mobile machine to detect the first and second calibration objects. The sensor calibration system may also have a controller in communication with the plurality of sensors. The controller may be configured to calibrate at least one of the plurality of sensors when the mobile machine is proximate the first worksite location, and to calibrate at least one other of the plurality of sensors when the mobile machine is proximate the second worksite location.03-25-2010
20100076708Machine sensor calibration system - A sensor calibration system for a mobile machine is disclosed. The sensor calibration system may have a positioning device configured to determine a desired sensing location on the mobile machine, a calibration object, and a sensor configured to sense a characteristic of the calibration object from an actual sensing location on the mobile machine and to generate a corresponding signal. The sensor calibration system may also have a controller in communication with the sensor and the positioning device. The controller may be configured to compare the characteristic sensed from the actual sensing location to a known characteristic associated with the desired sensing location, and to determine a difference between the actual sensing location and the desired sensing location based on the comparison. The controller may further be configured to correct subsequent signals generated by the sensor based on the difference.03-25-2010
20130080104METHOD FOR SYSTEMATICALLY TREATING ERRORS - A method for systematically handling errors, and an assemblage for carrying out the method, are presented. The method serves for systematically handing errors for a goniometer in the context of the transfer of position data with a position transducer, the position transducer possessing markings that are sensed with at least one sensor; a profile being deposited in a memory region in connection with said markings; the position transducer generating as a function of its position, by way of the markings, position signals that carry, as data, parameters that are deposited into a further memory region beginning with an address pointer value of 0; said address pointer being incremented with each position signal; and a synchronization between the position signals and the profile being created, and the values stored in the profile being used to modify the number of pulses outputted to the goniometer.03-28-2013
20130080103Method And Detector For Searching A Transmitter - The present invention relates to a method for searching a transmitter. Therein, the vectorial magnetic field strengths of the field emitted by the transmitter are detected for at least a first and a second measurement point relative to a reference axis of the detector carried by a searcher. Furthermore, at least one orientation difference (φ03-28-2013
20130085699SYSTEMS AND METHODS FOR THERMAL GRADIENT COMPENSATION FOR RING LASER GYROSCOPES - Systems and methods for thermal gradient compensation for ring laser gyroscopes are provided. In one embodiment, a method for producing bias compensated angular rate measurements from a ring laser gyroscope comprises: sampling an angle measurement output from a laser block sensor to obtain an angular rate measurement; obtaining an laser block temperature measurement (T04-04-2013
20100042349METHOD FOR COMPENSATING DRIFT IN A POSITION MEASURING DEVICE - Method for compensating the drift of an element for position measurement mounted on an object, such as a ship or another vehicle, including at least one gyro for measuring rotation of the object about an axis and at least one accelerometer for measuring two mutually perpendicular components of the acceleration of gravity as a consequence of the orientation of the object relative to the acceleration of gravity along two mutually perpendicular directions, which together correspond to the rotation of the object about the axis. The output signal from the accelerometer and the output signal from the gyro are low-pass filtered. These two signals are compared and the output signal from the gyro is compensated using an output signal from the accelerometer so that the deviation of the output signal of the gyro because of drift is decreased or eliminated. The thus produced, compensated signal constitutes an output signal from the gyro.02-18-2010
20100138180Moving Body Posture Angle Detecting Apparatus - An angular velocity detected by an angular velocity sensor (06-03-2010
20090030637METHOD OF MEASURING POSITION DETECTION ERROR IN MACHINE TOOL - A machine tool position detection error measurement method that eliminates the effects of pitch, yaw, and roll of the axes at the point of machining of a CNC machine tool and improved machining accuracy. The method comprises a step of compensating positioning accuracy of a positioning-error-measuring linear scale using a laser distance-measuring device, a step of mounting the compensated positioning-error-measuring linear scale parallel to a linear axis of the machine tool, and a step of comparing a motion amount obtained from the position detector by moving the linear axis a certain amount and a motion amount read from the positioning-error-measuring linear scale mounted parallel to the linear axis and storing a difference therebetween as error data of the position detector for the machine tool.01-29-2009
20110282612SELF-COMPENSATING ANGULAR ENCODER - A method for self-compensating a method includes the steps of rotating the patterned element relative to the read heads, the rotation about the axis to a plurality of first angles covering a range of at least 360 degrees; obtaining, at each of the plurality of first angles, first angular readings for the m measure read heads and for the reference read head; calculating a first array for each of the m measure read heads, each first array including, for each of the plurality of first angles, a difference in the first angular readings of the measure read head and the first angular reading of the reference read head; calculating, for each of the m measure read heads, at least one first spectral component based at least in part on the first array; calculating, for each of the m measure read heads, at least one second spectral component, the second spectral component based, at least in part, on the at least one first spectral component and on estimates of the second angles of the m measure read heads; and recording, for each of the m measure read heads, the at least one second spectral component.11-17-2011
20090150107METHOD FOR COMMISSIONING ACTUATORS - The disclosure relates to a method for commissioning pneumatically operated actuators that are controlled by a positioner. To determine the drive type, a constant flow of pneumatic fluid is applied to the actuator during commissioning while a drive-specific characteristic curve of the fed back position is recorded over time. Then the measured characteristic curve is compared with a given specimen characteristic curve. The drive type is inferred from the level of difference or agreement between the drive-specific characteristic curve and the specimen characteristic curve.06-11-2009
20110295538AUTOMATED SENSOR SPECIFIC CALIBRATION THROUGH SENSOR PARAMETER DOWNLOAD - A sensor system for measuring a clearance parameter between a stationary component and a rotating component of a rotating machine is provided. The system includes a clearance sensor to output a clearance measurement signal. A sensor memory is attached to the sensor for storing a first sensor information. A second sensor information is stored in a electronics interface memory. The first and the second sensor information are read and the clearance sensor is matched with a respective plurality of calibration data by an electronic interface based on the first and the second sensor information.12-01-2011
20110218753POSTURE INFORMATION CALCULATION DEVICE, POSTURE INFORMATION CALCULATION SYSTEM, POSTURE INFORMATION CALCULATION METHOD, AND INFORMATION STORAGE MEDIUM - A sensor information acquisition section acquires angular velocity information (GX, GY, GZ) around three axes acquired by three angular velocity sensors, and acceleration information (AX, AY, AZ) in three axial directions acquired by three acceleration sensors. A posture information calculation section calculates a posture angle and position coordinates in a virtual three-dimensional space based on the angular velocity information (GX, GY, GZ) and the acceleration information (AX, AY, AZ). The posture information calculation section calculates a fixed coordinate system velocity vector based on an inertial coordinate system acceleration vector (A) obtained from the acceleration information (AX, AY, AZ), and calculates position coordinates in a virtual three-dimensional space corresponding to the fixed coordinate system velocity vector.09-08-2011
20090319216Teaching device and teaching method - Teaching of height of a carrier stage relative to a transfer arm is performed with high accuracy. A teaching device is used when teaching the height of a carrier stage 12-24-2009
20100114518Encoder signal analysis system for high-resolution position measurement - An apparatus and method for identifying the position of a magnetic shaft are provided. N field sensors are adjacently positioned at fixed locations relative to the shaft's periodic field, corresponding to 180/N relative phase shifts. A table provides N>2 predetermined signal models and a pre-identified position associated with each. An interpolator compares a representation of the N measured sensor signals to at least two predetermined models to generate a correction signal that provides another pre-identified position. The correction signal depends on N sensors for every position of the shaft. The correction signal is used to incrementally choose said another pre-identified position from the table as an approximate position of the shaft in an iterative process to find the minimum correction signal and identify the position.05-06-2010
20090055117Method And Device For Compensating The Mounting Tolerances Of A Distance Sensor - A distance sensor with a method and device for compensating for mounting tolerances. Mounting tolerances may make distance sensors fail in correctly measuring the angle between the sensor and an object which will result in wrong lateral spacing to be computed. Sensor values therefore need to be corrected. Available methods of correction require quite a lot of memory capacity and processor power. The invention therefore aims at providing a method and a device that aid the compensation of mounting tolerances of a distance sensor, where compensation is provided with little effort and extremely quickly. This is achieved by having the distance sensor (02-26-2009
20100017162MEASUREMENT SYSTEM AND METHOD FOR MONITORING A MEASUREMENT SYSTEM - A measurement system has a transmitter for determining the position of a movable element, and a first energy store which, in the event of failure of an external electrical supply unit of the transmitter, supplies at least a part of the transmitter with electrical power such that a stored count of the transmitter is maintained in the event of failure of the external electrical supply voltage. The first energy store produces a first auxiliary supply voltage, wherein a first data item is stored in the transmitter when a reference mark of the transmitter is detected for the first time. The first data item is deleted in the event of failure of the external electrical supply voltage for the transmitter and failure of the first auxiliary supply voltage for the transmitter. As a result, an incorrectly determined position resulting from a failure of the electrical power supply for the transmitter can be identified.01-21-2010
20120143549METHOD FOR ADAPTIVELY COMPENSATING POSITION ERROR OF RESOLVER - Disclosed are an apparatus and method for adaptively compensating a position error of a resolver. The apparatus adaptively estimating a position error contained in position information of a rotor of a motor, which is digitalized by a resolver-digital converter, and subtracting the estimated position error from the measured position information of the rotor, thereby calculating compensated position information. A regression equation and a recursive least square method applied to the regression equation are used for the adaptive estimation of the position information.06-07-2012
20120296594PRESSURE DETECTION ARRANGEMENT AND METHOD - The present invention relates to a method and a device comprising a controller and a pressure sensor. The controller is configured to calibrate said pressure sensor based on a current position of said device and/or current pressure information received from a source.11-22-2012
20090287443Method for Calibrating a Navigation System - A method and apparatus for electromagnetic navigation of a surgical probe near a metal object. The electromagnetic navigation system includes a transmitter coil array and a shield. The transmitter coil array has a plurality of transmitter coils and is operable to generate the electromagnetic field to navigate the probe. The shield is positioned adjacent the metal object and is operable to shield the metal object from the electromagnetic field generated by the transmitter coil array, such that the shield substantially reduces distortion of the electromagnetic field by the metal object.11-19-2009
20120296593SYSTEM AND METHOD FOR DETERMINING POSITION OF ROTATING BLADES HAVING VARIABLE THICKNESS - A method and apparatus is disclosed for correlating signals generated by a sensor with a position of a plurality of rotating blades to determine turbine blade tip clearance and measurements. The sensor may be positioned in the housing of a turbine, and may be used to determine a radial clearance between the tips of a plurality of rotating turbine blades and a housing during turbine testing and/or operation. A method for using a plurality of sensors separated by a known distance is also disclosed. Other embodiments are disclosed and claimed.11-22-2012
20090265128CORRECTING FOR DISTORTION IN A TRACKING SYSTEM - A volume of a patient can be mapped with a system operable to identify a plurality of locations and save a plurality of locations of a mapping instrument. The mapping instrument can include one or more electrodes that can sense a voltage that can be correlated to a three dimensional location of the electrode at the time of the sensing or measurement. Therefore, a map of a volume can be determined based upon the sensing of the plurality of points without the use of other imaging devices. An implantable medical device can then be navigated relative to the mapping data.10-22-2009
20080228423POSITION DETECTOR - Two position sensors provide, as outputs, two signals that vary sinusoidally at a pitch of wavelength λ with respect to a displacement of a target and have phases shifted from each other by 90°. A memory unit has stored therein offset values for the two signals, and two subtractors eliminate the offset values from the two signals, respectively. The two signals after offset elimination are converted into position data in an interpolation calculator. A radius calculator calculates a radius value of the two signals after offset elimination. An FFT calculates offset values based on the position data and the radius values, and the calculated offset values are used to update the values stored in the memory unit. An amplitude ratio correction value and a phase difference correction value for the two signals are updated similarly. By performing elimination of the components that degrade interpolation accuracy at every rotational position, interpolation accuracy is improved.09-18-2008
20100145649TELESCOPE BASED CALIBRATION OF A THREE DIMENSIONAL OPTICAL SCANNER - An embodiment of the invention includes using a set of telescopes to calibrate a three dimensional optical scanner. Three separate calibrations are disclosed for a survey grade calibration: (1) angular calibration, implemented using at least one anti-podal pair of telescopes, (2) range calibration, implemented using at least one telescope mounted fiber recirculator, and (3) tilt calibration, implemented using at least one pair of telescopes not mounted in anti-podal configuration and an integral tilt table. Methods for aligning or measuring the mis-alignment between anti-podal telescope pairs are also described.06-10-2010
20110208459LITHOGRAPHIC APPARATUS AND METHOD FOR CORRECTING A POSITION OF A STAGE OF A LITHOGRAPHIC APPARATUS - A lithographic apparatus includes a stage to hold an object, the stage being moveable relative to a reference structure in a motion range; a magnet structure to provide a spatially varying magnetic field in at least a part of the motion range, the magnet structure being moveable relative to the reference structure and the stage; a first position measurement system to provide a first measurement signal corresponding to a position of the stage and/or the object in a measurement direction relative to the reference structure; a second position measurement system to provide a second measurement signal corresponding to a position of the stage relative to the magnet structure; and a data processor to correct the first measurement signal with a value dependent on the second measurement signal to provide a corrected first measurement signal representative of the position of the stage and/or the object relative to the reference structure in the measurement direction.08-25-2011
20090119050Surveying instrument - There are provided a horizontal angle detector for detecting a horizontal angle, an elevation angle detector for detecting an elevation angle, a dynamic displacement detecting means 05-07-2009
20090144008Filler metal installation position checking method and filler metal installation position checking system - The present invention is a filler metal installation position checking method and a filler metal installation position checking system for confirming difference between installation position and designed position of a filler metal embedded in a wall surface. A standard surface target 06-04-2009
20120078560Rotation angle detection device and electric power steering system using the same - A bridge circuit includes a plurality of half-bridges formed of sensor elements, which change impedance in accordance with a rotation angle of a detection target. A control circuit acquires output signals of the half-bridges and calculates a phase correction value for correcting a phase deviation. A memory circuit stores the phase correction value. The control circuit corrects a pre-correction rotation angle by the phase correction value. Since the pre-correction rotation angle is corrected by the phase correction value, a rotation angle of the detection target is detected with high accuracy even if the sensor elements are assembled with some positional deviations.03-29-2012
20080262772Sytem and a Method for Motion Tracking Using a Calibration Unit - The invention relates to motion tracking system (10-23-2008
20090248345Probe Calibration - A method of calibrating a probe is disclosed said probe being mounted on a machine and having a stylus with a workpiece contacting tip, comprising calculating calibration information for the probe for a first orientation of the probe, and rotating the calibration information by an angle to obtain a probe calibration information for when the probe is oriented by that angle with respect to the first orientation. Also disclosed is a method of calibrating a probe during a measurement process. The calibration information may include a vector which relates probe head axes to machine axes; a calibration matrix; datum data; an inertial matrix. The stylus tip may be datumed at the orientation of the probe or inferred from datum information obtained at different orientations. The rotation step may be carried out by a software/computer program which may be stored on a controller for the machine.10-01-2009
20100179782POSITION DETECTING DEVICE - A position detecting device includes a position calculator that performs an optimization convergence calculation using an evaluation function that expresses an error between a measurement value and a theoretical value of magnetic field information of a detection target to calculate at least a position of the detection target; a storage unit that stores a final convergence result of the optimization convergence calculation performed by the position calculator; and a controller that determines whether a result of the optimization convergence calculation converges, suspends the optimization convergence calculation performed by the position calculator when the result does not converge, and performs, after a predetermined time has passed, a returning process of returning a state of the optimization convergence calculation to a converged state by causing the position calculator to perform the optimization convergence calculation based on the final convergence result.07-15-2010
20100179781METHODS AND SYSTEMS FOR CALIBRATING VEHICLE VISION SYSTEMS - A method for calibrating a vision system of a vehicle includes the steps of projecting a pattern in proximity to the vehicle and calibrating the vision system using an image of the pattern generated by the vision system.07-15-2010
20100161266SYSTEM, METHOD AND PRODUCT FOR CALIBRATING INSPECTION TOOLS - The present invention relates to systems and methods for examining a number of components that have been assembled onto a substrate. In general, the invention relates to the calibration of inspection tools for inspecting components on the substrate. In particular, the invention relates to the calibration of inspection tools for detecting the accuracy of the array pegs positions on an assembled HTA plate.06-24-2010
20120197574Method For Calculating One Or More Parameters And A System For Detecting Spatial Placement - According to a first aspect, the invention relates to a method for determining the value of one or more parameter(s) in a computer system, particularly in a system detecting spatial placement, in the course of which characteristic data relating to a particular situation belonging to a particular value-set of the one or more parameter(s) is entered into the computer system, and by means of the computer system virtual characteristic data is calculated from the virtual value-set belonging to a virtual situation of the one or more parameter(s), the deviation between the characteristic data relating to the particular situation and the virtual characteristic data is minimized by means of tuning of the value of the one or more parameter(s), wherein for each parameter, the parameter-value at the reached minimum is determined as the value of the parameter. According to a second aspect, the relates to a system utilizing the method.08-02-2012
20100185408METHOD, DEVICE AND SYSTEM FOR CALIBRATING POSITIONING DEVICE - Embodiments of the present invention provide not only a technical solution for calibrating a positioning device but also a technical solution for characterizing an area of interest in a space. Specifically, there is provided a system, which may comprise: a tag capable of emitting ranging signals, placed at location points which are selected as space feature points in the space; a positioning device in said space, configured to obtain relative coordinates of said space feature points in relation to the positioning device based on the ranging signals from the tag; and a server, configured to determine location parameters of said positioning device in said space based on said relative coordinates, so as to calibrate said positioning device. The positioning device can be calibrated automatically, fast and accurately using the system.07-22-2010
20100241384METHOD FOR CALIBRATING A SPECIMEN STAGE OF A METROLOGY SYSTEM AND METROLOGY SYSTEM COMPRISING A SPECIMEN STAGE - A method for calibrating a specimen stage of a metrology system is provided, in which a specimen that has multiple marks is positioned successively in different calibration positions, each mark is positioned in the photography range of an optical system by means of the specimen stage in each calibration position of the specimen, and the mark position is measured using the optical system. A model is set up that describes positioning errors of the specimen stage using a system of functions having calibration parameters to be determined. The model takes into consideration at least one systematic measurement error that occurs during the measurement of the mark positions. The values of the calibration parameters are determined based on the model with consideration of the measured mark positions.09-23-2010
20100228513Systems and Methods for Performing Measurements of One or More Materials - Systems and methods for performing measurements of one or more materials are provided. One system is configured to transfer one or more materials to an imaging volume of a measurement device from one or more storage vessels. Another system is configured to image one or more materials in an imaging volume of a measurement device. An additional system is configured to substantially immobilize one or more materials in an imaging volume of a measurement device. A further system is configured to transfer one or more materials to an imaging volume of a measurement device from one or more storage vessels, to image the one or more materials in the imaging volume, to substantially immobilize the one or more materials in the imaging volume, or some combination thereof.09-09-2010
20100235127CALIBRATION OF A POSITION MEASURING DEVICE OF AN OPTICAL DEVICE - A method for calibrating a position measuring device of an optical device, including a measurement step in which a movable unit of the optical device is moved according to a predefinable scheme in at least one degree of freedom and a position of the movable unit is determined in the at least one degree of freedom. The position of the movable unit is determined in the at least one degree of freedom in a first measurement via a first measuring device of the position measuring device, and the position of the movable unit is determined in the at least one degree of freedom in a second measurement via a second measuring device of the position measuring device sing a reference element connected to the movable unit. In a calibration step, the first measuring device is calibrated using the results of the first measurement and the second measurement. An encoder system is used as the second measuring device. The reference element includes a reference grid of the encoder system.09-16-2010
20100241383ABSOLUTE TYPE LINEAR ENCODER AND METHOD FOR ADJUSTING POSITION THEREOF - An absolute type linear encoder includes: a scale including a plurality of tracks including a high-order and low-order tracks; and a detection head configured to detect a relative position to the scale; and a processing circuit configured to obtain the number of cycles of the low-order track by using a correction value obtained per correction pitch, the width of which is wider than the detection pitch, based on an error between tracks produced by a difference between the position of the high-order track to the detection head and the position of the low-order track thereto, output values of the high-order track and the low-order track, and a cyclic ratio of the low-order track to the high-order track, and obtain the position of the detection head to the scale based on the number of the cycles and the output value of the low-order track.09-23-2010
20100211345CALIBRATION OF AN AMR SENSOR - A joystick module has a joystick and a sensor for generating a signal in response to sensing a magnetic field representative of a position and/or orientation of the joystick. Using a linear dependence of the sensor's sensitivity on a distance between the joystick and the sensor, the sensor's signal representative of a tilt angle of the joystick can be calibrated in a simple manner.08-19-2010
20120245876ANGLE DETECTING DEVICE WITH COMPLEX SELF-CALIBRATION FUNCTION - An angle detecting device with a self-calibration function has sensor heads for reading a scale of a scale disc fixed to a rotating shaft, has first sensor heads and a second sensor head at a position of one of the first sensor heads, in which the first and second sensor heads are calibrated with a first group including L sensor heads and a second group including M sensor heads, respectively arranged with a different equiangular interval, and in which phases of the calibration values obtained from the second group, are shifted by j*P/L(j=1 to L−1), where P is the total number of scale marks, and average values of the calibration values from the second group and the shifted calibration values are obtained, the average values are added to the calibration values from the first group, and the added values are output as calibration values.09-27-2012
20090112502Methods and systems for assisting in the design of mobile surfaces of objects - A computer-aided method suitable for calculating the position of a mobile surface of an object such an aircraft that moves through a fluid medium, which is affected by at least an upstream or downstream object component, for achieving a predetermined value Vo of a predetermined object performance target, comprising the following steps: preparing a computer-implemented CFD model of said object having said mobile surface in a first position; solving said CFD model and obtaining the value Vi of said object performance target; if the difference between Vi and Vo is greater than a predetermined value, modifying the CFD model changing the position of the mobile surface in the CFD model and iterating the solving step. The invention also refers to a system for carrying out said method.04-30-2009
20090018790ENCODER APPARATUS AND CALIBRATION METHOD OF THE SAME APPARATUS - An encoder apparatus to measure a position of an object from an input analogue signal includes a driving plate which varies according to the position of the object, an optical device to receive a light response from the driving plate and to output a sinusoidal wave analogue signal according to an amount of the driving plate's movement, an analogue to digital (A/D) converter to output a normalized sinusoidal wave digital signal converted from the analogue signal outputted from the optical device, and a calibration unit to convert the sinusoidal wave digital signal outputted from the A/D converter into a triangular wave signal.01-15-2009
20110004431DEVICE AND METHOD FOR COMPUTER-ASSISTED 2D NAVIGATION IN A MEDICAL PROCEDURE - In a device and method for computer-assisted 2D navigation in a medical procedure, parameters of projection matrices of a 3D calibration process of a C-arm unit are used for the 2D navigation.01-06-2011
20110130996OFFSET ANGLE DETERMINATION FOR SYNCHRONOUS MACHINES - The present invention relates to a method for determining an offset angle of an electric machine, including a stator, a rotor, and a shaft connected to the rotor. The shaft is provided in an essentially no-load state, and the rotor is positioned with respect to the stator at a field angle which corresponds to the alignment of a rotor magnetic field generated by the rotor relative to the alignment of a stator magnetic field generated by the stator. A sensor angle is determined by measuring with the aid of an angle sensor connected to the shaft, the detected sensor angle being associated with the field angle. The offset angle is provided as a function of the difference between the field angle and the sensor angle, and the configuration of the rotor includes impressing a standing or rotating stator magnetic field which corresponds to the field angle. Moreover, the present invention relates to an angle detection device for carrying out the method of the present invention.06-02-2011
20110035173METHOD FOR INCREASING THE AVAILABILITY OF DISPLACEMENT/POSITION MEASURING SYSTEMS ON THE BASIS OF POTENTIOMETERS WITH A SLIDER TAP - The disclosure relates to a method for increasing the availability of displacement/position measuring systems on the basis of potentiometers with a slider tap in a closed control loop, the controller of which is formed by a microcontroller which is supplied with the position of the slider via an analog/digital converter. At least part of the sensor range of the potentiometer is scanned on request by presetting a sequence of manipulated variables and an available control loop variable which represents the position value at a high sampling rate outside process tasks is recorded, to determine the exact position of a defective slider position of the potentiometer by evaluating the variable. The reference variable of the control loop is overloaded in a defined manner within the process task such that the defective slider position is passed over during the displacement/position measurement and an intact slider position is reached.02-10-2011
20110035174TIME SYNCHRONIZATION IN AN IMAGE PROCESSING CIRCUIT - A controllable light source (02-10-2011
20110246114METHOD AND APPARATUS FOR CALIBRATING A FALL DETECTOR - This invention relates to a method and apparatus for calibrating a fall detector, a method of setting a fall detector, and a fall detector. According to the invention, the method of calibrating a fall detector comprises (a) acquiring the duration of a free fall of the fall detector; (b) calculating the change in height of the fall detector during the free fall from said duration; (c) measuring the change in height of the free fall by the fall detector; (d) calculating the difference between the calculated change in height and the measured change in height; and (e) updating a threshold in the fall detector for determining whether or not a fall has occurred on the basis of this difference.10-06-2011
20110246113FEEDBACK APPARATUS AND FEEDBACK METHOD FOR CONTROLLING A SERVOMOTOR - A feedback system for controlling a servo motor comprising at least one rotary angle sensor (10-06-2011
20100063764USE OF DIFFERENT PAIRS OF OVERLAY LAYERS TO CHECK AN OVERLAY MEASUREMENT RECIPE - An overlay measurement recipe is checked for reliability as follows. A first pair of overlay layers (03-11-2010
20090216476CORRECTION OF CALIBRATION ERRORS IN AN OPTICAL INSTRUMENT - A calibration error correction device for an optical instrument includes a detector operable to detect a position of a focusing lens of an optical instrument along a mechanical path of the focusing lens. A line of sight through an image plane of the optical instrument and the focusing lens at a present position defines an actual viewing direction. The device also includes a memory configured to store viewing direction errors specifying a deviation between a known theoretical viewing direction and the actual viewing direction associated with a plurality of different positions of the focusing lens along the mechanical path and an indicator of at least one value indicative of the actual viewing direction based on the theoretical viewing direction and the viewing direction errors at each of the different positions of the focusing lens along the mechanical path.08-27-2009
20110098959MULTI-POINT CALIBRATION METHOD FOR THE DEPTH OF A HORIZONTAL DIRECTIONAL DRILLING GUIDING INSTRUMENT - A multi-point calibration method for the depth of a horizontal directional drilling guiding instrument comprises: maintaining a constant power output of a normal power transmitter in a specific power supply condition; selecting at least two depth calibrations; receiving a signal transmitted from a transmitter and an intensity of a signal at a depth calibration position by a receiving instrument; performing a signal shaping and an analog/digital conversion to the signal received by a signal receiving instrument; and entering the signal into a central digital signal processor, and performing a depth calibration by any compensation method to obtain a required measuring depth. The invention improves the accuracy of the depth measurement of the horizontal directional drilling guiding instrument by using a plurality of compensation methods to compensate any error caused by the electric fields and environmental noises and occurred in the depth measurement of horizontal directional drilling guiding instrument.04-28-2011
20100070229PREDICTION ALGORITHM FOR SCNNING AN OBJECT - A distance measuring measurement instrument and a method for such a station for scanning a surface or volume of an object are disclosed. The measurement instrument includes a position calculating circuit adapted to calculate position data including at least horizontal and vertical angle and distance between the measurement instrument and the object. A plurality of points in each of a number of subsets of a scanning area of the object during a measurement session and, at detection of a new point in the new subset, information related to at least one point having a corresponding location in at least one preceding subset is used, wherein the preceding subset being adjacent to the new subset.03-18-2010
20110153250Cooperative Calibration of Heading Sensors - A primary device that includes a heading sensor and a remote secondary device cooperate to calibrate the heading sensor. The secondary device cooperates by measuring its Earth relative position and transmitting the position to the primary device. The primary device calculates a true heading from the positions of both devices and subtracts the true heading from a measured heading to the secondary device to form a heading calibration angle. The process may be extended to calculate a pitch calibration angle.06-23-2011
20110060542METHOD FOR DETERMINING DYNAMIC ERRORS IN A MEASURING MACHINE - A method for determining dynamic errors in a measuring machine that gives the position of a mobile element of the machine in a working space with respect to a reference system, comprising: a calibration step, defined in which is at least one input-output model, which describes the dynamic behaviour of at least part of the measuring machine; said input-output model yields, in response to at least one input quantity u, a plurality of output quantities y, which comprise, among other things, the position error introduced in the measurement of position by the elastic deformations of parts of the machine that undergo dynamic deformation; a step of definition of an estimator filter that yields, in response to measured values of input quantities u and, in response to measured values of a subset of the output quantities y, an estimate of the position error; the filter is obtained by means of an analytical method based upon the input-output model; and a step of continuous real-time reconstruction of the error, in which the measured values of the input quantities u and the measured values of a subset of the output quantities y are applied at input to said estimator filter.03-10-2011
20110040513POSITION SENSING SYSTEM AND METHOD - The linear position of a moving mechanical component is determined. A plurality of values of a quantity using a plurality of sensors is sensed and the sensed values are indicative of the linear position of the mechanical component. The plurality of sensed values are converted into a plurality of best linear position estimates concerning the mechanical component. One or more compensations are applied to at least some of the plurality of best linear position estimates. Each of the compensations are applied to account for a relative positioning of one of the plurality of sensors with respect to the others. A plurality of weighting factors associated with each of the plurality of best linear position estimates are determined. The position of the mechanical component is determined using the plurality of best linear position estimates and the plurality of weighting factors.02-17-2011
20100280780POSITIONING METHOD, POSITIONING DEVICE, AND PROGRAM - A positioning method includes: executing a first positioning mode or a second positioning mode, a first positioning process that is performed using a least-square method based on a positioning signal and a second positioning process that is performed using a Kalman filter based on the positioning signal utilizing a positioning result obtained by the first positioning process as a base value being performed in the first positioning mode, and the second positioning process being further performed in the second positioning mode utilizing a positioning result obtained by the second positioning process as a base value; determining accuracy of a positioning result obtained by the second positioning process performed in the executed positioning mode; and changing the positioning mode to be executed to the first positioning mode or the second positioning mode corresponding to the accuracy.11-04-2010
20100004888MEASUREMENT APPARATUS - A measurement apparatus of the present invention is configured to measure a position of an object to be measured using two signals approximated by a cosine function and a sine function representing the position of the object to be measured, the measurement apparatus including a regression arithmetic unit (01-07-2010
20120065912CALIBRATION DEVICE AND METHODS FOR USE WITH A LIQUID HANDLER - In some embodiments, an apparatus includes a calibration member, an imaging device and a proximity sensor. The calibration member is configured to be removably coupled to a deck of a liquid handling system. The calibration member has an alignment portion configured to matingly engage a portion of the deck such that a position of the calibration member is fixed with respect to the deck. The imaging device is coupled to the calibration member such that an axis of a lens of the imaging device intersects the deck at a first predetermined location relative to a deck reference point in at least a first dimension and a second dimension. The proximity sensor is coupled to the calibration member such that a calibration reference point on the proximity sensor is at a second predetermined location relative to the deck reference point in a third dimension.03-15-2012
20080243415Calibrating the Positions of a Rotating and Translating Two-Dimensional Scanner - Systems and methods are provided that comprise calibration techniques and associated systems that identify the two-dimensional position, or other alignment or positioning, of sample wells or other calibration objects located in a sample well plate, or other surface or area of interest. In some embodiments, calibration of the plate and/or positioning and/or alignment with respect to detection optics can be performed in multiple stages for two or more dimensions.10-02-2008
20110054820METHOD FOR COMPENSATING FOR ANGULAR TRANSMISSION ERROR OF WAVE GEAR DEVICE - A positioning system (03-03-2011
20110257920POSITION CALCULATING METHOD AND POSITION CALCULATING DEVICE - A method of calculating the position of a moving body includes: detecting a movement direction of the moving body; calculating a velocity vector of the moving body using a detection result of an acceleration sensor installed in the moving body; correcting the velocity vector using the movement direction; and calculating the position of the moving body using the corrected velocity vector.10-20-2011
20110125441OPTICAL DISTORTION CALIBRATION FOR ELECTRO-OPTICAL SENSORS - Optical distortion calibration for an Electro-Optical sensor in a chamber eliminates calibration of the mirror controller and allows for calibration while the target is in motion across the FOV thus providing a more efficient and accurate calibration. A target pattern is projected through sensor optics with line of sight motion across the sensor FOV to generate a sequence of frames. Knowing that the true distances between the same targets remain constant with line of sight motion across the sensor's FOV, coefficients of a function F representative of the non-linear distortion in the sensor optics are fit from observed target positions in a subset of frames to true line of sight so that distances between targets are preserved as the pattern moves across the FOV. The coefficients are stored as calibration terms with the sensor.05-26-2011
20110137600Calibrating the Positions of a Rotating and Translating Two-Dimensional Scanner - Systems and methods are provided that comprise calibration techniques and associated systems that identify the two-dimensional position, or other alignment or positioning, of sample wells or other calibration objects located in a sample well plate, or other surface or area of interest. In some embodiments, calibration of the plate and/or positioning and/or alignment with respect to detection optics can be performed in multiple stages for two or more dimensions.06-09-2011
20110071784Goos-Hanchen compensation in autofocus systems - A new and useful method is provided for Goos-Hanchen compensation in an optical autofocus (AF) system that uses light reflected from a substrate to determine changes in the z position of a substrate. According to the method of the invention reflected light from the substrate is provided at a plurality of wavelengths and polarizations, detected and used to make corrections that compensate for the errors due to the Goos-Hanchen effect.03-24-2011
20090171609Image Forming Apparatus and Method for Correcting Position Displacement - A disclosed image forming apparatus for detecting position displacement patterns and correcting position displacement of an image forming position in a main scanning direction according to the detection result, includes a position displacement amount calculating part configured to calculate the amount of the position displacement according to the detection result, a position displacement correcting part configured to correct the position displacement by performing at least one of multiplication correction or multiplication error deviation correction, a correction amount calculating part configured to calculate a multiplication error deviation correction amount for correcting multiplication error deviation generated by the multiplication correction, a first determining part configured to determine whether to plot a first position displacement correction pattern included in the position displacement patterns for performing the multiplication error deviation correction according to the multiplication error deviation correction amount, and a plotting part configured to plot the position displacement correction patterns.07-02-2009
20120310577ELECTRONIC DEVICE AND METHOD FOR UPDATING COORDINATE SYSTEMS DURING EDITING OF A MEASUREMNT PROGRAM - In a method for updating coordinate systems in editing a measurement program, the method imports a data array including measurement elements of a workpiece, and creates a program template. By inserting the program template in the data array that is after a measurement element, the method creates a coordinate system and calculates a coordinate matrix for the coordinate system. After the measurement elements in a position of the data array that are after the program template are updated using the coordinate matrix, a measurement program is generated and displayed on a display screen.12-06-2012
20110077890METHOD FOR THERMALLY COMPENSATING A GAGING DEVICE AND THERMALLY COMPENSATED GAGING STATION - Thermal drifts compensation method in a gaging device (03-31-2011
20100082280Systems and Methods for Compensating for Large Moving Objects in Magnetic-Tracking Environments - Methods for accurately tracking position and orientation of a magnetic-field sensor in a tracking volume when a large magnetic-field distorter is present in the tracking volume. In some of the methods, magnetic field data is collected from within the tracking volume both with and without the large magnetic-field distorter present in the tracking volume. This data is used to obtain correction information that is subsequently used during real-time operation of the magnetic-field sensor to correct the position and orientation solutions for the sensor for magnetic-field distortions caused by the presence of the large magnetic-field distorter in the tracking volume. Others of the methods involve modeling the large magnetic-field distorter using dipole and multipole modeling. Magnetic tracking systems for implementing the methods include hardware and software for carrying out the methods.04-01-2010
20110191052TARGETED DATA COLLECTION FOR POSITIONING SYSTEMS - Selecting devices from which to receive data for adjusting the performance of a positioning system. The positioning system infers the location of the devices based on beacons observed by the devices. The performance of the positioning system is compared to performance targets. One or more of the devices are selected based on the comparison. Data collection from the devices is adjusted to affect performance of the positioning system (e.g., improved or reduced). For example, if the positioning system predicts positions poorly for a particular area, data collection from selected devices within the particular area may be increased.08-04-2011
20120209554SYSTEM AND METHOD FOR THREE DIMENSION LOCATION DETERMINATION - The location of an asset can be determined in three dimensions using pressure data from reference sensors in combination with conventional two-dimensional location technology, such as GPA or TDOA. In a building, reference sensors are distributed on multiple floors and transmit accurate pressure readings to a receiver. The asset also has a pressure sensing element and transmits the pressure at its location to the receiver. The asset pressure value is compared with the reference pressure sensor values to determine the floor in a building on which the asset is located. Thus, the combination of accurate two-dimensional location technology and pressure sensors can accurately determine the location of an asset in three dimensions.08-16-2012
20080201097METHOD AND APPARATUS FOR ALIGNMENT OF COMPONENTS - Methods and apparatus are described for aligning components. Misalignment is calculated based on sensed values with a controller illustrating a process for data acquisition with graphical icons and indicia that include and/or are based on sensed data. The alignment process also includes graphical icons showing the process for alignment and the direction and amount of correction needed to achieve adequate alignment.08-21-2008
20120078561Method for Calibrating a Target Surface of a Position Measurement System, Position Measurement System, and Lithographic Apparatus - A method is used to calibrate a target surface of a position measurement system configured to measure a position of a movable object. The position measurement system includes the target surface mounted on the movable object, a stationary sensor system, and a processing device to calculate a position of the movable object on the basis of at least one measurement signal of the sensor system. The processing device includes a correction map of the target surface to correct for irregularities of the target surface. The method includes recalibrating the correction map of the target surface by measuring the target surface and determining a recalibrated correction map of the complete target surface on the basis of the measured target surface and one or more deformation modes of the target surface and/or physical objects affecting the target surface.03-29-2012
20090030638SELF-CALIBRATION METHOD AND APPARATUS FOR ON-AXIS ROTARY ENCODERS - A self-calibration method and apparatus for on-axis rotary encoders comprising the steps of: receiving output signals from a detector during a spindle-free response period, the signals including a plurality of data sets wherein each data set comprises the periods between sampling events occurring in one revolution of the encoder at an angular speed, selecting a data set pair from the output signals, wherein the data set pair contains two linearly uncorrelated data sets; defining a model of the angular distances between each sampling event occurring in one revolution of the encoder as a function of one or more damping coefficients and the periods between each sampling event as contained in the data set pair; solving the model for the angular distances for the data set pair using circular closure and dynamic reversal techniques; and establishing an encoder error map using the selected solved angular distances from the model.01-29-2009
20120041702MOVING STATE DETECTING DEVICE - To accurately calculate an attached angle of an accelerometer and accurately correct an acceleration that is obtained from the accelerometer: a frequency analyzing module of an acceleration corrector divides a sensor coordinate system acceleration into a bias frequency component, a gravity frequency component, a movement acceleration frequency component, and a noise frequency component, through a wavelet transform. The frequency analyzing module outputs a sum component of the gravity frequency component and the movement acceleration frequency component to an attached angle estimating module and a correcting operation module. The attached angle estimating module estimation-calculates the attached angle of an accelerometer and outputs it to the correcting operation module. The correcting operation module corrects the acceleration, which is including of the sum component of the gravity frequency component and the movement acceleration frequency component, based on the estimation-calculated attached angle to calculate a movable body coordinate system acceleration.02-16-2012
20120065913MANAGEMENT DEVICE, MANAGEMENT METHOD, AND PROGRAM RECORDING MEDIUM - An example of the object of the present invention is to provide a technology with which a high precision error table for an oscillation frequency is created. The present invention includes a temperature sensor which measures temperature of the oscillator used in a GPS (Global Positioning System) when a position measurement by the GPS is performed, and a management unit which measures error of an oscillation frequency of the oscillator after the position measurement by the GPS has been performed, creates and stores an error table in which the measured temperature by the temperature sensor is associated with the error.03-15-2012
20090030636Method and System for Performing Optical Proximity Correction with Process Variations Considerations - A method for performing optical proximity correction with process variations considerations is disclosed. The maximum aerial gradient direction for a control point associated with an edge is initially determined. Then, a variational edge placement error 01-29-2009
20120116705SYSTEM AND METHOD FOR ODOMETER CALIBRATION - A system for odometer calibration for a motor vehicle is provided. The system can include a first source of speed data that provides first speed data during operation of the motor vehicle, and a second source of speed data that provides second speed data during a portion of the operation. The system can also include a vehicle speed control module that computes overall average speed data based on the first speed data and a duration of operation. The system includes a speed control module that determines an average first speed for the portion of the operation in which the second source of speed data provides the second speed, and computes an average second speed. The system can include an odometer correction control module that computes corrected odometer data based on the overall average speed data and a ratio of the average second speed to the average first speed.05-10-2012
20090024342Compensated measurement of angular displacement - There is disclosed methods and apparatus for compensated measurement of angular displacement within an instrument (01-22-2009
20130013241METHOD FOR CALIBRATION OF DYNAMIC MOTION SENSORS - An improved method for calibration of dynamic motion sensors. In one aspect, the method comprises sending a low frequency driving signal to an exciter to generate a harmonic movement in a shaker table, using an optical position sensor to produce an output representative of position, computing the acceleration of the shaker table and a dynamic motion sensor under test (SUT), and comparing the output of the SUT with the instantaneous acceleration of the shaker table at different frequencies sufficient to define the performance characteristics of the SUT within a selected frequency range, among other things. In another aspect, the method comprises calibration of a dynamic motion SUT by simultaneous direct measurement of position and time. In another aspect, the optical position sensor has an electrical output representative of position for attaining a desired degree of positional accuracy.01-10-2013
20120022819Correcting the Motion of a Monochromator - A novel means of correcting the motion of an analytical instrument is introduced herein based on the determination of the optimal theoretical parameters in the equation of grating angle versus a selected wavelength. Such a desirable correction method of the present invention not only reduces the amount of wavelength error at the calibration points but also in a novel fashion beneficially corrects for errors in a time-efficient manner between the calibration points to a greater degree than conventional calibration methods.01-26-2012
20110093228CALCULATION METHOD AND CALCULATION APPARATUS - The present invention provides a method of calculating a surface shape of a target surface, including the steps of defining, as a measurement target region, each of a plurality of regions on the target surface in which adjacent regions overlap each other, and obtaining data that give the heights at the plurality of positions in each of the plurality of regions, and removing, for each of the plurality of regions, an average data from the data that are obtained in the step of obtaining the data and give the heights at the plurality of positions in each of the plurality of regions, thereby generating correction data for each of the plurality of regions.04-21-2011
20110093227SYSTEMS AND METHODS FOR LOCATION, MOTION, AND CONTACT DETECTION AND TRACKING IN A NETWORKED AUDIOVISUAL DEVICE - Systems and methods for location, motion, and contact detection and tracking in a portable networked device are disclosed. A portable device may include a motion detection unit including an accelerometer for detecting accelerations in one or more axes. Signals associated with the detected motion are processed to generate estimates of device acceleration, velocity, and relative and absolute locations. Additional processing may be performed to detect user gestures or other user input relevant to portable device control. Particular motion or vibrational characteristics may be also be detected and used by other processes in the portable device.04-21-2011
20120158340ROTATION ANGLE DETECTION DEVICE - A rotation angle calculation unit includes a first rotation angle calculation portion, a second rotation angle calculation portion, a third rotation angle calculation portion, an abnormality monitoring portion, and a final rotation angle calculation portion. The abnormality monitoring portion determines, based on a first output signal, a second output signal, and a third output signal, whether the first to third output signals are each normal or abnormal. The final rotation angle calculation portion calculates a final rotation angle based on the final determination result obtained by the abnormality monitoring portion and the first to third rotation angles calculated by the first to third rotation angle calculation portions, respectively.06-21-2012
20120158341ROTATION ANGLE DETECTION DEVICE - A rotation angle calculation unit calculates a zero-crossing time point when a zero-crossing is detected for an output signal V06-21-2012
20100017161Vision alignment with multiple cameras and common coordinate at contactor for ic device testing handlers - A method and apparatus for aligning a device with a contactor is provided. The apparatus includes a pick and place device, for transporting the device. A first camera acquires an image of the device relative to device holder fiducials of the pick and place device. A second camera detects the location of the contactor relative to fiducials positioned on an alignment frame plate. A third camera to image frame and device holder fiducials to correlate the first and second camera coordinates. Given a processor determines the alignment difference between the device and the contactor. A plurality of actuators align the device with the contactor.01-21-2010
20110066393Calibration Of A Manipulator - A measuring apparatus (03-17-2011
20120123720ROBOTIC HELIOSTAT CALIBRATION SYSTEM AND METHOD - A robotic controller for autonomous calibration and inspection of two or more solar surfaces wherein the robotic controller includes a drive system to position itself near a solar surface such that onboard sensors may be utilized to gather information about the solar surface. An onboard communication unit relays information to a central processing network, this processor combines new information with stored historical data to calibrate a solar surface and/or to determine its instantaneous health.05-17-2012
20090132192MEASUREMENT APPARATUS - A measurement apparatus of the present invention is a measurement apparatus 05-21-2009
20120221274TARGET TRACKING DEVICE AND TARGET TRACKING METHOD - According to one embodiment, target tracking device includes track calculator and correction unit. Track calculator calculates a track of a target based on angular measurement of the target measured by a passive sensor. Correction unit sends correction data to the track calculator. Correction unit calculates correction data based on state vector of target input from an external device. Track calculator calculates track for each of a plurality of motion models based on angular measurement and correction data. Track calculator calculates the track of the target based on the track for each of the motion models. Track calculator calculates the track of the target by weighted sum of all tracks for the motion models.08-30-2012
20120221273TARGET TRACKING DEVICE AND TARGET TRACKING METHOD - According to one embodiment, target tracking device includes passive processor, active processor, fusion unit and correction unit. Passive processor calculates passive track of target based on passive measurement of target angle measured by passive sensor. Active processor calculates active track of target based on active measurement of target distance and angle measured by active sensor. Fusion unit combines passive track and active track to output combined track. Correction unit calculates correction data based on combined track. Passive processor calculates track of the target for motion models based on passive measurement and correction data and calculates passive track by weighted sum of all tracks for motion models.08-30-2012
20120215475MAGNETIC SENSING USER INTERFACE DEVICE METHODS AND APPARATUS - Methods for processing signals from a magnetic user interface device having a manual actuator are disclosed. Movements of the actuator may cause relative movement between one or more magnets and one or more corresponding sensors that may each generate signals representing independent magnetic field components detected within each sensor. A field model may be used in the magnetic user interface device to translate magnetic sensor readings during operation to position information, which may then be converted to output signals for transmission to an electronic computing system representing displacement and/or deformation of the actuator. The output signals may be generated in a predetermined format, such as USB format or other computer-interface formats, that can be interpreted by the electronic computing system.08-23-2012
201101846843-D SELF-CORRECTING FREEHAND ULTRASOUND TRACKING SYSTEM - This application presents a new system and method for image acquisition of internal human tissue, including but not limited to the prostate, as well as a system and method for the guidance and positioning of medical devices relative to the internal tissue. In the presented systems and methods, ultrasound scanned data (e.g., 2-D B-mode images) are acquired freehand absent a mechanical armature that constrains an ultrasound acquisition probe in a known spatial framework. To allow for reconstruction of the scanned data into a 3-D image, multiple tracker sensors that provide position/location information are used with a freehand acquisition probe (e.g., handheld ultrasound probe). The position of such tracker sensors can be calculated when disposed in an electromagnetic field.07-28-2011
20120316820INFORMATION PROCESSING APPARATUS AND INFORMATION PROCESSING METHOD - An information processing apparatus includes an acquisition unit configured to acquire a plurality of positions on a surface of a measurement target object using information of light reflected from the measurement target object on which structured light is projected, a position of a light source of the structured light, and a position of a light reception unit configured to receive the reflected light and acquire the information of the reflected light, a calculation unit configured to acquire at least one of a position and a direction on the surface of the measurement target object based on the plurality of the positions, and a correction unit configured to correct at least one of the plurality of the positions based on information about an error in measurement for acquiring the plurality of the positions and at least one of the position and the direction on the surface of the measurement target object.12-13-2012
20120316819Process for estimation of ballistic missile boost state - A computer-implemented method is provided for generating the estimation of current position, velocity and acceleration state vectors and associated uncertainty estimation (covariance) of a boosting ballistic missile. The method includes constructing a state tensor of the projectile from a plurality of sensor measurements in Earth-Centered, Earth-Fixed (ECEF) coordinates; translating the state tensor to Cartesian coordinates as a transform state; determining a covariance matrix from the transform state; updating the transformed state as an updated transform state; and updating the covariance matrix as an updated covariance. The process can further include adjusting the covariance matrix by an approximate transition matrix and a process noise matrix. The noise matrix can be translated from a local noise matrix based on a propagation time-step, a scaling parameter, and a bias process noise level. A time-of-flight in the state tensor can be updated by smoothing from a launch event.12-13-2012
20100274514VEHICLE WHEEL ALIGNMENT MEASURING METHOD AND APPARATUS - A vehicle wheel alignment measuring method and apparatus capable of measuring wheel alignment of a vehicle body with high accuracy without wheels mounted in an assembly line. A dummy wheel (10-28-2010
20100010766Calibration method for a position determination of a rear axle steering actuator - The present invention relates to a method for the calibration of a position determination system of a rear axle steering actuator for a motor vehicle. The rear axle steering actuator has an actuator element which can be driven by a rotary movement of a rotor to a translation movement and whose geometrical center position is determined by means of a reference measurement. The position determination system includes a linear sensor and a rotary sensor. During the calibration of the position determination system, a piece of calibration information is generated which includes a piece of zero point information of the linear sensor and a piece of sector information. The measurement range of the rotary sensor is divided into at least two sectors. The sector information identifies that angle at which the angular position of the rotor defined by the rotary sensor lies when the actuator element is arranged in its geometrical center position. The calibration information is stored in the linear sensor.01-14-2010
20120253725Apparatus, tool, and method for modifying a portion of a floor plan based on measurements made by one or more sensors - An apparatus, tool, and method for modifying a portion of a floor plan based on measurements made by one or more sensors. The apparatus comprises a correction unit for compensating the sensor measurements for instrument errors and a layout unit for improving the conformity of the portion of the floor plan to a set of layout rules. The apparatus may also comprise the sensors that made the measurements.10-04-2012
20100292946Form measuring instrument, and calibration method and calibration program therefor - Provided is method of calibrating Y-axis direction position of contact tip of form measuring instrument including: table rotatable about Z-axis; contact tip capable of contacting workpiece; and contact tip driving means to drive contact tip in at least X- and Z-axis directions among X-, Y- and Z-axis directions perpendicular to one another. Method performs tracing measurement of inclined surface or inclined cylinder side surface which is part of workpiece obtained by inclining workpiece placed on table about Y-axis, or side surface of off-centered cylinder having center axis off-centered in X-axis direction by rotating surface to obtain measurement value at each angular position of rotation of table, obtains angular position of rotation at which smallest value among measurement values of tracing measurement is detected as angular position of rotation with smallest detected value, and adjusts Y-axis direction position of contact tip based on angular position of rotation with smallest detected value.11-18-2010
20090326848ORIENTATION CALCULATION APPARATUS AND STORAGE MEDIUM HAVING ORIENTATION CALCULATION PROGRAM STORED THEREIN - A game apparatus calculates a gravitational vector Vg, which represents a gravitational direction viewed from an input device, based on operation data. Then, a motion acceleration vector VA, which represents an acceleration applied by a motion of the input device, is calculated based on an acceleration represented by acceleration data and the gravitational vector Vg. The gravitational vector Vg is corrected such that the motion acceleration vector VA approaches a motion acceleration (vector VA′) satisfying a relationship with an angular rate (vector Vω) represented by angular rate data, the relationship being predefined between the motion acceleration and the angular rate for the input device making a predetermined motion (rotational motion). Furthermore, the game apparatus calculates an orientation of the input device corresponding to the corrected gravitational vector.12-31-2009
20120191397Method and apparatus for monitoring motion of a body - A method and apparatus for monitoring motion of a rigid body, such as a head, in which a plurality of reference sensors are attached to a calibration structure, such as a helmet, and a plurality of body-mountable sensors are adapted for mounting on the rigid body. Once mounted, the positions and orientations of the body-mountable sensors may be unknown. In operation, a processing unit receives signals from the reference sensors and the body-mountable sensors and determines calibration parameters for the body-mountable sensors. The calibration parameters depend upon the sensitivity of the body-mountable sensors to linear, rotational and centripetal motions. These sensitivities, in turn, are dependent upon the positions and orientations of the body-mountable sensors. Body motion is determined from the body-mountable sensors using the calibration parameters.07-26-2012
20120239333VARIABLE STEP TRACKING - Variable step tracking is described in which a monitoring station is operable to receive data signals representative of step movement of an asset as detected by a monitoring device carried by the asset. A database stores a step length of the asset. A step length modification module modifies the step length based on at least one of energy, asset orientation, direction, and frequency associated with the step movement. An asset position is estimated with respect to a known location based on cumulative step lengths.09-20-2012
20120239334Sensor Monitoring of a Position Measurement Apparatus by Means of Thermal Noise - A position measurement apparatus includes a material measure and a scanning apparatus, which can move with respect to the material measure, with the scanning apparatus having at least one receiver turn arrangement, by means of which measurement markings on the material measure can be scanned. The scanning apparatus further includes an evaluation apparatus which can measure the electrical receiver voltage which is pressed on the receiver turn arrangement, in order to produce a position signal therefrom. The evaluation apparatus is designed to determine a noise measure from the receiver voltage, with comparison means furthermore being provided, which can compare the noise measure with a predeterminable tolerance band. The evaluation apparatus further includes an indication means which can indicate that the noise measure is outside the tolerance band.09-20-2012
20120239332BUILDING PERPENDICULARITY TESTING AND ADJUSTMENT - Tracking a person in a building can be performed by obtaining a building layout with respect to a surrounding geography and tracking movement of the person using a monitoring device carried by the person. A correction angle can be calculated to normalize tracked movement of the person with respect to a skew angle of the building layout. The correction angle can be applied to the tracked movement of the person or the building layout.09-20-2012
20120265472POSITION CORRECTION APPARATUS, POSITION CORRECTION METHOD, PROGRAM, POSITION CORRECTION SYSTEM - Systems and methods for correcting a location of a terminal are provided. A processor in a position correction apparatus may select an action label from a plurality of action labels, and may associate the selected action label with the terminal. In various aspects, the selected action label may be selected by the processor based on a movement of the terminal. The processor may further select a correction algorithm for correcting the position of the terminal, where the selected correction algorithm may be selected from one or more correction algorithms that are associated with the selected action label. The processor may then correct the position of the terminal to a corrected position of the terminal using the selected correction algorithm.10-18-2012
20120323515USER-MOUNTED DEVICE CALIBRATION USING EXTERNAL DATA - Systems, methods, and computer media for calibrating user-mounted devices are provided. An external device capable of providing calibration data to a user-mounted device worn by a user is identified. An identification acknowledgement is received from the external device. A device calibration mode is entered in which calibration data describing the user-mounted device is received by the user-mounted device. The calibration data is based at least in part on sensor data acquired and normalized by the external device. The calibration data is then received. The calibration data includes at least one determined pose or body measurement of the user and a calculated alignment of the user-mounted device relative to the user. The user-mounted device is calibrated using the received calibration data.12-20-2012
20120330594METHOD AND APPARATUS FOR ESTIMATING 3D POSITION AND ORIENTATION THROUGH SENSOR FUSION - An apparatus and method for estimating a three-dimensional (3D) position and orientation based on a sensor fusion process is provided. The method of estimating the 3D position and orientation may include estimating a strength-based position and a strength-based orientation of a remote apparatus when a plurality of strength information is received, based on an attenuation characteristic of a strength that varies based on a distance and orientation, estimating an inertia-based position and an inertia-based orientation of the remote apparatus by receiving a plurality of inertial information, and estimating a fused position based on a weighted-sum of the strength-based position and the inertia-based position, and to estimate a fused orientation based on a weighted-sum of the strength-based orientation and the inertia-based orientation. The strength-based position and the strength-based orientation may be estimated based on a plurality of adjusted strength information from which noise is removed using a plurality of previous strength information.12-27-2012
20120323516PATIENT ALIGNMENT SYSTEM WITH EXTERNAL MEASUREMENT AND OBJECT COORDINATION FOR RADIATION THERAPY SYSTEM - A patient alignment system for a radiation therapy system. The alignment system includes multiple external measurement devices which obtain position measurements of components of the radiation therapy system which are movable and/or are subject to flex or other positional variations. The alignment system employs the external measurements to provide corrective positioning feedback to more precisely register the patient and align them with a radiation beam. The alignment system can be provided as an integral part of a radiation therapy system or can be added as an upgrade to existing radiation therapy systems.12-20-2012
20110231134CHARGED PARTICLE BEAM WRITING APPARATUS AND METHOD THEREFOR - A charged particle beam writing apparatus includes a reading unit to read an identifier (ID) from a substrate where an absorber film which absorbs extreme ultraviolet (EUV) light is formed and the identifier which can be optically read is formed, a storage unit to store defect position information indicating a position of a defect on the substrate based on reference marks, defect size information indicating a size of the defect, which are corresponding to the identifier, and pattern data for writing, an examination unit to input partial pattern data corresponding to a region including at least the defect in the pattern data, the defect position information based on reference marks, and the defect size information, and to examine whether a pattern layout is formed such that the defect is located in a region where the absorber film remains after patterning, and a writing unit to write a pattern on the substrate using a charged particle beam, based on the pattern data in which the pattern layout is formed such that the defect is located in the region where the absorber film remains after patterning.09-22-2011
20120095712ROTATING FIELD SENSOR - An angle detection unit including first to third arithmetic units receives first and second signals that are associated with intensities of components of a rotating magnetic field in mutually different directions. The first arithmetic unit generates a sum of squares signal made up of the sum of squares of the first and second signals. Based on the sum of squares signal, the second arithmetic unit calculates a first error component estimate which is an estimated value of a first error component included in the first signal and a second error component estimate which is an estimated value of a second error component included in the second signal. The third arithmetic unit generates a first corrected signal by subtracting the first error component estimate from the first signal, generates a second corrected signal by subtracting the second error component estimate from the second signal, and calculates a detected angle value based on the first and second corrected signals.04-19-2012
20110320154ROTATION ANGLE POSITIONING DEVICE - In a rotation angle positioning device 12-29-2011
20110320153Inertially Tracked Objects - Described are computer-based methods and apparatuses, including computer program products, for inertially tracked objects with a kinematic coupling. A tracked pose of a first inertial measurement unit (IMU) is determined, wherein the first IMU is mounted to a first object. The tracked pose of the first IMU is reset while the first object is in a first reproducible reference pose with a second object.12-29-2011
20110161032CORRECTION OF A VEHICLE POSITION BY MEANS OF LANDMARKS - A position for a vehicle is corrected by detecting landmarks on the journey route and correcting the measured vehicle position when a landmark of this kind has been identified. The landmarks are stored in a database in the vehicle with associated exact GPS positions. When a landmark is reached, the associated exact GPS position is compared with the position measured in the vehicle, whereupon the measured position is corrected. In this way, the position finding can be improved.06-30-2011
20110161034DEVICE FOR ADJUSTING THE LIGHT SOURCE OF AN ELECTRONIC ALIGNMENT DEVICE, OPERATION BEING SIMPLIFIED BY MOTORIZED ADJUSTMENT OF THE LIGHT SOURCE, AND A METHOD IN WHICH THIS DEVICE IS USED - Method and device for precision adjustment of the beam direction of the light source of a device for aligning two objects relative to one another, the beam direction being moved by a motor via input elements of the computer of the alignment device.06-30-2011
20110161033CORRECTION OF IMAGING ERRORS IN ALIGNMENT SYSTEM WITH SEVERAL MEASUREMENT PLANES LOCATED IN SUCCESSION IN THE BEAM PATH - A method for correction of the measured values of optical alignment systems with at least two measurement planes which are located in succession in the beam path. From each measurement plane, the beam path to the light source is transformed back in order to compute new incidence points using a beam which has been corrected by taking into consideration imaging errors.06-30-2011
20130173197COMPUTING DEVICE AND METHOD FOR CORRECTING DIAL INDICATORS USING THE COMPUTING DEVICE - In a dial indicator correcting method, a first command is sent to a single drive shaft for controlling a push rod to move toward dial indicators. The method records a first indicated value of each dial indicator when the push rod contacts with one of the dial indicators, and records a second indicated value of each dial indicator when the push rod has contacted all the dial indicators. The method further sends a second command to the single drive shaft for controlling the push rod to move when a distance of the push rod equals a measuring range, and records a third indicated value of each dial indicator when the push rod moves with each moving step. By subtracting the third indicated value from the second indicated value, a forth indicated value of each dial indicator is obtained and is corrected by a running deviation of the single drive shaft.07-04-2013
20130173198CIRCUIT ARRANGEMENT AND METHOD FOR MONITORING A DSP IN THE CONTEXT OF A SAFETY-CRITICAL APPLICATION - The invention relates to a circuit arrangement of a sensor-triggered control and/or display system in the context of a safety-critical application with a DSP and a method for monitoring the DSP, characterized-in-that the position and/or attitude signals transferred to the DSP are reduced in terms of their information content, the reduced information content is delivered to a position and attitude computation instance and checked as to whether the unambiguous position and/or attitude determined by the DSP agrees with the inaccurate and/or ambiguous position and/or attitude determined by the position and attitude computation circuit within the scope of the accuracy and/or ambiguity, and a sensor fault signal is output if the check is negative.07-04-2013
20080255788Method for calibrating a powered seat - A method of calibrating a powered seat includes storing a first position of at least one seat part in a memory, calculating a second position of the at least one seat part by adding to the first position a difference between a predetermined value of first position and a predetermined value of the second position, and storing the calculated second position in the memory.10-16-2008
20080221821Error Correction Method for a Displacement Sensor Signal - A method and device for correcting an error caused by electromagnetic interference, in a signal of an inductive displacement sensor or angle sensor, in that when known activation of at least one component which causes electromagnetic interference occurs and there is a known error resulting therefrom in the sensor signal of the inductive displacement sensor or angle sensor the error in the measured sensor signal is corrected.09-11-2008
20110270562Profile measuring apparatus - According to one embodiment, a profile measuring apparatus comprises a profile measuring unit, a position acquiring unit, a profile calculating unit, a deflection detecting unit, and a controlling unit. The profile measuring unit has a projecting unit to project a pattern onto a measured object, and an imaging unit to image the pattern. The position acquiring unit acquires a position of the pattern on the measured object. The profile calculating unit calculates a profile of the measured object, based on image information from the imaging unit and position information from the position acquiring unit. The deflection detecting unit detects deflection of the projecting unit. The controlling unit executes active correction for the profile measuring unit and/or passive correction for the profile calculating unit, based on the deflection of the projecting unit detected by the deflection detecting unit.11-03-2011
20130090876METHOD FOR DETECTING ELECTROMAGNETIC PROPERTY OF ORIENTED SILICON STEEL - A method for detecting electromagnetic property of oriented silicon steel, the method comprises: measuring Euler angles of each of crystal grains in a specimen by use of metallographic etch-pit method; calculating orientation deviation angle θ04-11-2013
20130096863USER-MOUNTED DEVICE CALIBRATION USING EXTERNAL DATA - Systems, methods, and computer media for calibrating user-mounted devices are provided. An external device capable of providing calibration data to a user-mounted device worn by a user is identified. An identification acknowledgement is received from the external device. A device calibration mode is entered in which calibration data describing the user-mounted device is received by the user-mounted device. The calibration data is based at least in part on sensor data acquired and normalized by the external device. The calibration data is then received. The calibration data includes at least one determined pose or body measurement of the user and a calculated alignment of the user-mounted device relative to the user. The user-mounted device is calibrated using the received calibration data.04-18-2013
20130096861Method and Apparatus for Testing Received Signals in a Radio Signal Positioning System - A method including receiving signals associated with multiple antenna elements; obtaining a parameter of the received signals for at least some of the multiple antenna elements; testing the obtained parameters; if the test fails, rejecting the received signals for use in positioning the apparatus; if the test passes, using the received signals for positioning the apparatus.04-18-2013
20130103338METHODS AND APPARATUSES FOR DYNAMIC PROBE ADJUSTMENT - An improved method and apparatus for automatically aligning probe pins to the test or bond pads of semiconductor devices under changing conditions. In at least one embodiment, a dynamic model is used to predict an impact of changing conditions to wafer probing process. This reduces the need for frequent measurements and calibrations during probing and testing, thereby increasing the number of dice that can be probed and tested in a given period of time and increasing the accuracy of probing at the same time. Embodiments of the present invention also make it possible to adjust positions of probe pins and pads in response to the changing conditions while they are in contact with each other.04-25-2013
20130179107MOVING STAGE ESTIMATION APPARATUS, METHOD AND PROGRAM - According to one embodiment, a moving state estimation apparatus includes a sensor, a storage, a first estimation unit, a second estimation unit, a calculation unit and a correction unit. The sensor detects acceleration data. The first estimation unit estimates certainty degrees of the moving states. The second estimation unit calculates orientations of the terminal based on the acceleration data, and to estimate terminal states. The calculation unit calculates reliability degrees of the moving states. The correction unit corrects the certainty degrees in accordance with the reliability degrees, to obtain corrected moving states with the certainty degrees corrected.07-11-2013
20130124130APPARATUS AND RELATED METHOD FOR MEASURING AND CALIBRATING A UTILITY METER - An apparatus for reading a utility meter of the type having a dial gauge and a dial pin is disclosed. The apparatus includes a dial gauge interacting device configured for interacting with the utility meter. A control module is in communication with the dial gauge interacting device. The control module is configured to determine a position of the dial based on the interaction of the dial gauge interacting device with the utility meter. The dial gauge interacting device may be a smart phone. A related method is also disclosed.05-16-2013
20130132019ALTITUDE ESTIMATION APPARATUS, ALTITUDE ESTIMATION METHOD, AND PROGRAM - An information processing apparatus that acquires estimated altitude data corresponding to a position based on detection information detected by a sensor at or near the position, and corrects altitude data associated with the position based on the estimated altitude data.05-23-2013
20130132018POSITION DETECTOR - In a position detector for detecting a position of a detection body, a signal processing circuit processes a signal outputted from a magnetic field detection element. A first storage circuit stores the signal outputted from the magnetic field detection element and outputs a signal to an external device through an output circuit in a normal operation mode. A second storage circuit stores an output value of the first storage circuit. When a malfunction determination circuit determines an instantaneous power interruption mode, a signal route changing circuit prevents a signal transmission between the first storage circuit and the second storage circuit and a signal transmission between the first storage circuit and the output circuit, prevents the second storage circuit from updating data for a certain period of time, and permits the second storage circuit in which updating is prevented to output a signal to the output circuit.05-23-2013
20130132017HEIGHT CALIBRATION PROCESS - There is provided a system for carrying out a height calibration process in a wireless indoor location tracking network, comprising: a plurality of fixed location tracking nodes disposed indoors to cover an indoor area, wherein the plurality of fixed location tracking nodes is configured to carry out location tracking in the indoor area; a mobile tag configured to communicate with at least one location tracking node at a given time at least for the purposes of determining the location of the mobile tag, wherein that the mobile tag comprises a height sensor configured estimate the height of the mobile tag; and at least one location tracking node of the plurality of fixed location tracking nodes is a calibration node configured to co-operate in carrying out a height calibration process during operation of the location tracking network, wherein the height of each calibration node is known.05-23-2013
20090177428Method of Measuring Peripheral Tilt Angle, Method and Device for Inspecting Inspection Object Having Surface Mounds, Method of Determining Position of Illumination Means, Irregularity Inspection Device, and Light Source Position Determining Device - The method of measuring a peripheral tilt angle in accordance with the present invention, to address the problems, is a method of measuring a peripheral tilt angle on an inspection object having surface mounds, the method including: the step A of projecting light onto the inspection object; the step B of sensing distribution of light reflected off the inspection object; the step C of obtaining a feature point of the distribution of the reflected light from result of the sensing of the distribution of the reflected light; and the step D of obtaining a peripheral tilt angle which is a tilt angle near a periphery of each of the surface mounds based on an angle of projection of the light in step A to a position which, on the inspection object, corresponds to the feature point and an angle of sensing of the reflected light in step B off a position which, on the inspection object, corresponds to the feature point. Thus, the invention provides a method whereby a peripheral tilt angle, or a tilt angle of a surface mound near its periphery on an inspection object is obtained and also provides a method whereby deviation in height of the surface mound is precisely inspected based on the peripheral tilt angle.07-09-2009
20130138377METHOD FOR COMPENSATING DRIFT IN A POSITION MEASURING DEVICE - Method for compensating the drift of a gyro mounted on a vessel subjected to at least rotational motions, about horizontal axes centered around an equilibrium position, and vertical translational motions, which vessel includes a three-axial accelerometer for measuring the acceleration of the vessel along three directions, includes low pass filtering the output signal from the gyro, calculating an inclination signal based upon the measurement values of the accelerometer and low pass filtering it, compensating the output signal from the gyro based upon the difference between the two low pass filtered signals, selecting the cut-off frequency of the low pass filtration of the inclination signal so that it is larger than a typical oscillation frequency for the translational motions but smaller than a typical oscillation frequency for the rotational motions, calculating a total force vector from the three measurement values, and calculating the inclination signal based upon the total force vector.05-30-2013
20130096862ENCODER AND APPARATUS WITH THE SAME - The encoder includes a scale provided with a periodic pattern, a sensor relatively movable with respect to the scale and reading the periodic pattern to output analog signals each having a changing period corresponding to the periodic pattern and having mutually different phases, an A/D converter performing time-division analog-to-digital conversion on the analog signals output from the sensor to produce digital signals, and a phase detector detecting a phase from the digital signals. The encoder further includes a corrector calculating a correction value by using a relative movement speed of the scale and the sensor and the detected phase detected by the phase detector, and calculating a corrected phase from the correction value and the detected phase, and a position detector calculating a position in a direction in which the scale and the sensor are relativity moved by using the corrected phase.04-18-2013
20100292947SCAN HEAD CALIBRATION SYSTEM AND METHOD - A method and system are provided for reducing a positioning error for positioning a light beam either onto or from a workpiece. A calibration mark is provided, and an image of the calibration mark is captured, to compare with a guide mark. The position of the guide mark corresponds to a set of design data or coordinates. The position of the image of the calibration mark is adjusted until the image matches with the guide mark. A set of vision compensating factors can therefore be determined. Thereafter, an image of a laser mark is captured, and adjusted to match the guide mark, to determine a set of scan head compensating factors. The design data can then be modified based on the vision compensating factors and the laser compensating factors, and used to position the laser beam onto the workpiece or capture light from a work piece to form an image.11-18-2010
20100318307METHOD FOR ADJUSTING OR CALIBRATING A VEHICLE SURROUNDING SENSOR, AND A VEHICLE SURROUNDING SENSOR ADJUSTMENT OR CALIBRATION SYSTEM - A method according to the invention for adjusting or calibrating a vehicle surroundings sensor (12-16-2010
20120283978AXIS RUN-OUT MEASURING METHOD AND ANGLE DETECTING DEVICE WITH SELF-CALIBRATION FUNCTION HAVING AXIS RUN-OUT MEASURING FUNCTION - An angle detecting device with self-calibration function, in which sensor heads are provided with an equiangular interval on a scale disc fixed to a rotating shaft, one sensor head is selected as reference, a sum of measurement differences between the reference and another sensor head is divided by the number of sensor heads, to determine an average, whereby a self-calibration value is obtained, in which a sensor head of the reference is changed to another in order, and the respective self-calibration value is obtained, which value is deviated by an angle of arrangement with respect to a particular sensor head, and a phase is aligned to a self-calibration value of the particular one as the reference, to determine an average for calculations of this phase conversion, which average is subtracted from the respective calculation subjected to the phase conversion, to obtain only asynchronous angular errors.11-08-2012
20130197844MEASUREMENT APPARATUS - A measurement apparatus includes a mount configured to mount an object, a probe configured to move with respect to the object so as to measure a shape of the object, an interferometer configured to measure a position of the probe with respect to a reference mirror, and a calculator configured to calculate the shape of the object using a measured value relating to the shape of the object that is obtained based on the position of the probe measured by the interferometer and a relative displacement between the object and the reference mirror that is obtained based on a signal from a sensor for the object and the reference mirror while the probe is moved.08-01-2013
20100057392INDEXED OPTICAL ENCODER, METHOD FOR INDEXING AN OPTICAL ENCODER, AND METHOD FOR DYNAMICALLY ADJUSTING GAIN AND OFFSET IN AN OPTICAL ENCODER - An optical encoder may include an encoder disk, an illumination system, and a detector to detect light diffracted from the encoder disk. The encoder disk may include a signal track comprising a diffraction grating, and an index track comprising a reflective index mark, wherein a width of the index mark is larger than a pitch of the diffraction grating. An indexing method may include providing an encoder disk, providing an illumination system to direct light to the encoder disk, providing a detector structured to detect light diffracted from the encoder disk, calculating an estimated count of quadrature states from a rising edge of an index pulse to a middle of the index interval, and calculating the quadrature state at an approximate center of the index pulse. A dynamic parameter correction method may include calculating a target gain and offset and correcting values based on the target gain and offset.03-04-2010
20130204566Manual Positioning Device - A manual positioning device includes at least one receiver, a reference network, a first switch, and at least one second switch. The at least one second switch, together with the first switch, is configured to switch at least two different reference signal paths for determining reference signals on the reference network.08-08-2013
20130204567METHOD AND ARRANGEMENT FOR DETERMINING ALTITUDE - The invention relates to a portable electronic device and method for determining altitude. The device can comprise a satellite-positioning sensor for determining the elevation of the device on the basis of satellite data, a barometric sensor for measuring atmospheric-pressure information and/or an acceleration sensor for measuring acceleration information, and means for determining the altitude reading on the basis of the satellite-based elevation and the atmospheric-pressure and/or acceleration information. According to the invention, the means for determining the altitude reading are arranged to calculate a corrected altitude reading with the aid of the rate of change in elevation determined at least partly on the basis of the elevation determined on a satellite basis and atmospheric-pressure and/or acceleration information. With the aid of the invention, the altitude profile of exercise can be measured precisely.08-08-2013

Patent applications in class Position measurement

Patent applications in all subclasses Position measurement