Class / Patent application number | Description | Number of patent applications / Date published |
702092000 | Direction (e.g., compass) | 77 |
20080201096 | COMPASS CALIBRATION SYSTEM AND METHOD - An in-vehicle compass system and method that is calibrated based on a magnetic field model and/or a deviation analysis based on a location signal received from a positioning system. | 08-21-2008 |
20080221820 | System for First Pass Filtering of Anomalies and Providing a Base Confidence Level for Resource Usage Prediction in a Utility Computing Environment - Provided is a system for monitoring resources in a utility computing environment (UCE). Measurements are evaluated to determine whether or not a particular resource requires remedial or other type of action. A sliding measurement window is employed to assemble a number of measurements corresponding to a particular resource. The number of intervals in a sliding measurement window is based upon best practices corresponding to the resource being measured and analyzed. A first threshold-crossing event and subsequent events are stored until the window is full, or closed. When the window is closed, the threshold-crossing measurements are analyzed to determine whether or not there exists an issue with the resource that requires action. Once a window has been closed and analyzed, the first threshold-crossing event and each subsequent event up to a second threshold-crossing event are discarded and the window reopens. | 09-11-2008 |
20080228422 | INFORMATION PROCESSING APPARATUS AND INFORMATION PROCESSING METHOD - A calibration information calculation unit ( | 09-18-2008 |
20090006020 | COMPASS SENSOR UNIT AND PORTABLE ELECTRONIC DEVICE - In a compass sensor unit, an azimuth data computing method is carried out by the steps of: inputting a signal from a geomagnetic sensor to measure magnetic field; determining whether to store measurement data of the magnetic field based on a distance from the last stored measurement data; calculating an offset value based on the stored data; making a comparison for each component of a plurality of measurement data used for calculating the offset value, and judging the offset value to be valid when a difference between the maximum and minimum values of each component is a given value or more; updating the already stored offset value to the offset value judged to be valid; and correcting newly provided measurement data by the updated offset value to compute azimuth data. | 01-01-2009 |
20090012733 | OFFSET CORRECTION PROGRAM AND ELECTRONIC COMPASS - When an external magnetic field is applied to a sensor unit | 01-08-2009 |
20090070056 | METHOD AND DEVICE FOR CALIBRATING A MAGNETIC SENSOR - Measurements are acquired from a magnetic sensor during a non-pre-ordered movement, and a plurality of sets of solutions are determined for respective expected values of intensity of the Earth's magnetic field. The solutions are defined by a plurality of parameters, including at least one gain value for each detection axis of the magnetic sensor. For each solution, a figure of merit is determined, correlated to a calibration error, and a partial solution is selected in each set of solutions, based on the figure of merit. Once a gain confidence interval has been defined, a calibration solution is selected based on the figure of merit, from among the partial solutions having respective gain values all falling within the gain confidence interval. | 03-12-2009 |
20090070057 | CALIBRATION PROGRAM AND ELECTRONIC COMPASS - The object of the present invention is to provide a calibration program and an electronic compass that make it possible to calibrate the output of a magnetic sensor with a small amount of computation while a user does not notice the execution of calibration. | 03-12-2009 |
20090089001 | Self-calibrated azimuth and attitude accuracy enhancing method and system (SAAAEMS) - A method and system for Self-calibrated Azimuth and Attitude Accuracy Enhancing are disclosed, wherein SAAAEMS approach is based on fully auto-calibration self-contained INS principles, not depending on magnetometers for azimuth/heading determination, and thus the system outputs and performance are not affected by the environmental magnetic fields. In order to reduce the system size and cost, this new innovative methods and algorithms are used for SAAAEMS system configuration and integration. Compared to a conventional INS for gyrocompassing, AGNC's approach uses a smaller number of high accuracy sensors: SAAAEMS uses only one 2-axis high accuracy gyro (for example, one DTG) instead of 3-axis; the third axis gyro is a MEMS gyro. It uses only 2 high accuracy accelerometers instead of 3, since the two accelerometers are used only for gyrocompassing not for navigation. These two changes to the conventional INS system configuration remarkably reduce the whole system size and cost. SAAAEMS, uses dynamic gyrocompassing processing for isolation of Base motion disturbance/interference and vibration. SAAAEMS provides a method and system for using automatic methods for system calibration. | 04-02-2009 |
20090171607 | PORTABLE ELECTRONIC DEVICE CAPABLE OF RE-CALIBRATING AZIMUTH AND METHOD THEREOF - One or more sensors in a portable electronic device have individual status parameter in response to different using configurations. When the portable electronic device operates in a first using configuration, an electronic compass in the portable electronic device loads a corresponding first default setting, according to the status parameter of the sensors operated in the first using configuration, and detects the geomagnetic field for outputting azimuth data. When the portable electronic device changes its configuration from the first using configuration to a second using configuration, the electronic compass stops detecting the geomagnetic field and loads a corresponding second default setting, according to the status parameter of the sensors operated in the second using configuration, and detects the geomagnetic field for outputting azimuth data. The electronic compass is capable of properly detecting the geomagnetic field by loading different default settings when facing interference of different magnetic fields. | 07-02-2009 |
20090171608 | MAGNETIC DATA PROCESSING DEVICE, MAGNETIC DATA PROCESSING METHOD, AND MAGNETIC DATA PROCESSING PROGRAM - In a magnetic data processing device, a magnetic data input part sequentially receives magnetic data output from a three-dimensional (3D) magnetic sensor. A storage part stores a plurality of the magnetic data as a data set of statistical population. An acceleration data input part receives acceleration data output from a 3D acceleration sensor. A reliability determination part derives a reliability index that is a function of an angular difference between a direction of a line perpendicular to an approximate plane representing a distribution of the data set of the statistical population and a direction of acceleration represented by the acceleration data. | 07-02-2009 |
20090254294 | PROCESSES FOR MORE ACCURATELY CALIBRATING AND OPERATING E-COMPASS FOR TILT ERROR, CIRCUITS, AND SYSTEMS - An electronic circuit includes an electronic compass (e-compass | 10-08-2009 |
20090292495 | Dynamic motion control - In one embodiment a method and corresponding apparatus are arranged to determine an accurate device heading by continuously combining an average magnetic heading with the compensated inertial heading. The example embodiment obtains the compensated inertial heading by compensating for a time delay of an inertial heading. | 11-26-2009 |
20090292496 | VEHICLE COMPASS COMPENSATION - A compass compensation system is provided for automatically and continuously calibrating an electronic compass for a vehicle, without requiring an initial manual calibration or preset of the vehicle magnetic signature. The system initially adjusts a two axis sensor of the compass in response to a sampling of at least one initial data point. The system further calibrates the compass by sampling data points that are substantially opposite to one another on a plot of a magnetic field and averaging an ordinate of the data points to determine a respective zero value for the Earth magnetic field. The system also identifies a change in magnetic signature and adjusts the sensor assembly. | 11-26-2009 |
20100010765 | System and Method for Azimuth Angle Calibration - An improved procedure for calibrating the azimuth angle in a metrology module for use in a metrology system that is used for measuring a target on a wafer, and the metrology modules can include oblique Spectroscopic Ellipsometry (SE) and unpolarized or polarized spectroscopic reflectometer devices. | 01-14-2010 |
20100017160 | DEVICE COMPRISING A SENSOR ARRANGEMENT AND AN UPDATER | 01-21-2010 |
20100063763 | Self calibrating gyroscope system - A self-calibrating gyroscope system provides improved estimates of, and compensation or calibration for, scale factor errors and bias errors. The gyroscope system employs a plurality of gyroscope units having sense or input axes in a mutually non-parallel arrangement. The number of gyroscope units is preferably at least one more than the number of axes for which rate estimates is required. A Mode Reversal technique is used to obtain an estimate of bias error for a selected gyroscope. A Random Closed-Loop Scale Factor technique is used to obtain an estimate of scale factor error for a selected gyroscope. Because the Mode Reversal technique temporarily disrupts operation of the affected gyroscope, each of the gyroscopes may be taken offline temporarily, in turn, for calibration, and thereafter returned to normal operation. Because at least one redundant gyroscope is provided, when a selected gyroscope is offline, rate information from the remaining operating gyroscopes can be used to derive a reference rate about the axis of the offline gyroscope. | 03-11-2010 |
20100114517 | METHOD AND SYSTEM FOR ORIENTATION SENSING - An orientation sensing system uses an algorithm that iteratively improves an estimate of the body attitude. In each iteration, an error vector is generated that represents the difference between the actually measured sensor signals on the one hand, and a model-based prediction of these sensor signals, given the attitude estimate of the previous iteration, on the other hand. From the compound sensor data error vector, an attitude estimation error (a 3 degrees-of-freedom rotation) is calculated by multiplying the compound error vector by the pseudo-inverse of a sensitivity matrix. An improved attitude estimate is then obtained by applying the inverse of the attitude estimation error to the old attitude estimate. | 05-06-2010 |
20100153050 | Autonomous Underwater Vehicle Borne Gravity Meter - Techniques and systems are disclosed for performing a gravity survey near the seafloor. In one aspect, a system includes an autonomous underwater vehicle that includes a sensor system holding area. The system includes a gravity sensor system to fit inside the sensor system holding area of the autonomous underwater vehicle. The gravity sensor system includes a motorized gimbal to provide a leveled sensor platform. Also, the gravity sensor system includes a gravimeter sensor mounted onto the motorized gimbal to measure gravity data. Further, the payload includes a motion sensor mounted onto the motorized gimbal to measure motion data associated with movements of the autonomous underwater vehicle. | 06-17-2010 |
20100250176 | COMPASS SYSTEM AND METHOD FOR DETERMINING A REFERENCE FIELD STRENGTH - A compass system comprises a magnetic field sensor for measuring an ambient magnetic field and a magnetic field generator, corresponding to the magnetic field sensor, configured to generate a reference magnetic field. The magnetic field sensor is configured to measure the reference magnetic field. The compass system further comprises a control circuit operably connected to the magnetic field sensor and magnetic field generator, wherein the control circuit is configured to process the ambient magnetic field and the reference magnetic field measurements to determine an absolute reference field strength for use in calibrating the compass system. | 09-30-2010 |
20100286940 | STORAGE MEDIUM STORING INFORMATION PROCESSING PROGRAM, AND INFORMATION PROCESSING APPARATUS - An information processing program is provided, which is executed by a computer of an information processing apparatus that executes predetermined processing based on acceleration data outputted from an input device including an acceleration sensor for detecting acceleration. The information processing program causes the computer to function as data obtaining means, change amount calculation means, and gravity direction calculation means. The data obtaining means repeatedly obtains the acceleration data. The change amount calculation means calculates, by using a history of acceleration indicated by the acceleration data, a change amount of acceleration generated in the input device. The gravity direction calculation means calculates a direction of gravity of the input device by using the acceleration indicated by the acceleration data, based on the change amount of the acceleration. | 11-11-2010 |
20100299093 | Bearing Calculator and Error Correction Method - A bearing calculator provided with a geomagnetic sensor for detecting earth-geomagnetism and a control unit for calculating a geographical bearing based on detection values of the geomagnetic sensor. The control unit can execute offset error correction processing for correcting the offset error to the geomagnetic sensor based on a change in the magnetic field inside the bearing calculator. When detection values of the geomagnetic sensor enter an abnormal state, it performs said offset error correction processing when the abnormal state continues for a predetermined time, while does not perform the offset error correction processing when the abnormal state ends within a predetermined time. | 11-25-2010 |
20110010121 | MAGNETIC DATA PROCESSING DEVICE, MAGNETIC DATA PROCESSING METHOD, AND MAGNETIC DATA PROCESSING PROGRAM - In a magnetic data processing device, an accumulating part sequentially acquires magnetic data output from a 3D magnetic sensor to provide a recent statistical population of the magnetic data. A past statistical population storage part stores, as a past statistical population, magnetic data output from the 3D magnetic sensor prior to the magnetic data accumulated as the recent statistical population. A determination part determines whether a distribution of the recent statistical population satisfies a certain condition, and determines whether a mixed statistical population of the past and recent statistical populations satisfies another condition when the recent statistical population does not satisfy the certain condition. An offset derivation part derives an offset of the magnetic data based on the recent statistical population when it satisfies the certain condition and derives an offset of the magnetic data based on the mixed statistical population when it satisfies said another condition. The past statistical population storage part updates the past statistical population using the recent statistical population. | 01-13-2011 |
20110015888 | MAGNETIC DATA PROCESSING DEVICE, MAGNETIC DATA PROCESSING METHOD, AND MAGNETIC DATA PROCESSING PROGRAM - In a magnetic data processing device, an accumulation part repeatedly accumulates a predetermined number of magnetic data to provide a statistical population, while sequentially acquiring magnetic data output from a 3D magnetic sensor. A determination part determines, when the predetermined number of magnetic data is accumulated as a statistical population, whether or not the statistical population is spread two-dimensionally using a first threshold, and determines, when the statistical population is spread two-dimensionally, whether or not an angle between a first plane and a second plane is small to a negligible extent using a second threshold, the first plane including a circle about which the statistical population is concentrated, and the second plane being perpendicular to a line segment connecting a center of the circle and a current offset of the magnetic data. An offset update part updates the current offset based on the statistical population so that the current offset moves in a direction parallel to the first plane as a result of updating, in case that the statistical population is spread two-dimensionally and the angle between the first plane and the second plane is not small to the negligible extent. | 01-20-2011 |
20110035172 | SYSTEM AND METHOD FOR DETERMINING PARAMETERS REPRESENTING ORIENTATION OF A SOLID IN MOVEMENT SUBJECT TO TWO VECTOR FIELDS - The system for determining parameters representing the orientation of a solid in movement subject to a first vector field and a second vector field—comprises a first triaxial sensor and a second triaxial sensor integral to said solid for measuring the components of said respective vector fields along the axes of said sensors, and means for determining the rotation matrix of the solid. Said means for determining said rotation matrix comprise:
| 02-10-2011 |
20110087450 | Heading Error Removal System for Tracking Devices - Systems are able to reduce or remove slowly-varying drift errors, such as heading errors, rate of rotation errors, and direction of travel errors, to correct the measurements from tracking devices. The systems may be used to remove the slow varying drift errors for gyroscopic tracking device sensors, or other types of sensors used for determining heading, rates of rotation, direction of travel, or position. The systems may be employed in personal dead reckoning systems, or other personnel tracking device, as well as in vehicle tracking devices. The system uses heuristic assumptions to correct for these drift errors, via a feedback loop control having an accumulator responsive to changes in output signals. The accumulator is able to produce a signal that over time compensates for the inherent drift errors on those output signals. | 04-14-2011 |
20110087451 | COMPASS CALIBRATION SYSTEM AND METHOD - An in-vehicle compass system and method that is calibrated based on a magnetic field model and/or a deviation analysis based on a location signal received from a positioning system. | 04-14-2011 |
20110098958 | AZIMUTH COMPUTING DEVICE, AZIMUTH COMPUTING METHOD, AZIMUTH COMPUTING PROGRAM, AND ELECTRONIC DEVICE - An azimuth computing device includes an azimuth computing unit for computing azimuth data by using an output from a magnetic sensor; a buffer unit for storing the azimuth data; a control unit for outputting azimuth data if the azimuth data stored in the buffer unit by a predetermined number of pieces is within a predetermined range; and a storage unit for storing the output azimuth data as a reference azimuth. The control unit outputs azimuth data if the azimuth data stored in the buffer unit is within a predetermined angle from the reference azimuth, and discards at least part of the azimuth data stored in the buffer unit if the azimuth data stored in the buffer unit is not within the predetermined range. | 04-28-2011 |
20110106474 | ACCURATE MAGNETIC COMPASS IN MOBILE ELECTRONIC DEVICE - Methods and apparatus are described herein for calibration and correction of non-constant sensor errors, and in particular non-constant compass errors, that are based in part on changing software and hardware modes of a host device. The non-constant errors induced in the sensor by each mode and combination of modes is determined in a calibration that may be determined during pre-production testing of one or more host devices. The calibration results can be incorporated into software and/or hardware of the host device. During normal operation, a sensor correction can be applied to sensor measurements based in part on the active mode or combination of modes. | 05-05-2011 |
20110196636 | MEASUREMENT METHOD FOR A COMPONENT OF THE GRAVITY VECTOR - The present disclosure relates to methods and apparatuses for calibrating a sensor, particularly a gravimeter, which involves positioning the sensor in at least three different orientations and calibrating the sensor using a linear model and the sensor outputs from the at least three different orientations. The method may include applying an external force to the sensor. The apparatus includes a processor and storage subsystem with a program that, when executed, implements the method. | 08-11-2011 |
20110231133 | Methods and Systems for Wireless Platform Attitude Determination - Wireless platform attitude information such as pitch, roll and heading are disclosed. Attitude estimates can be made by using orthogonally mounted gyroscopes. Attitude estimates can be also made by determining the direction of arrival of signals and comparing the direction of arrival of the signals with the position of the transmitters and the position of the receiver. The attitude estimates can be then combined to determine “real time” attitude information. | 09-22-2011 |
20110301898 | AUTOMATIC DATA COLLECTION ALGORITHM FOR 3D MAGNETIC FIELD CALIBRATION WITH REDUCED MEMORY REQUIREMENTS - A magnetic compass comprising a magnetometer for taking readings of a magnetic field and a processing unit that calibrates the magnetic compass is provided. The processing unit is configured to validate a predetermined number of magnetic field samples and calculate calibration coefficients from the validated magnetic field samples. Each validated magnetic field sample is at least a minimum separation angle apart from every other validated magnetic field sample. | 12-08-2011 |
20110320151 | Portable Electronic Apparatus and Geomagnetism Sensor Calibration Method - A portable electronic apparatus able to suppress a drop of display precision concerning a bearing due to a drop of a detection precision of geomagnetism accompanying non-contact communication by electromagnetic coupling etc. and a calibration method of a geomagnetism sensor are provided. When a non-contact communication function part ( | 12-29-2011 |
20110320152 | INTEGRATED CLOSED-LOOP HYBRIDIZATION DEVICE BUILT IN BY CONSTRUCTION - The invention relates according to a first aspect to a hybridization device ( | 12-29-2011 |
20120072155 | CORRECTION METHOD OF GEOMAGNETIC SENSOR IN MOBILE DEVICE, MOBILE DEVICE, AND PROGRAM - A mobile device has a geomagnetic sensor, position detection means for detecting a position of the mobile device, and a controller operable to control the geomagnetic sensor and the position detection means. When the position detection means detects a predetermined position change, the controller starts a correction process of the geomagnetic sensor based upon the detection. | 03-22-2012 |
20120191396 | GYROSCOPE SYSTEM MAGNETIC FIELD ERROR COMPENSATION - One embodiment of the invention includes a nuclear magnetic resonance (NMR) gyroscope system. The system includes a gyro cell that is sealed to enclose an alkali metal vapor, a first gyromagnetic isotope, and a second gyromagnetic isotope. A magnetic field generator configured to generate a magnetic field that is provided through the gyro cell to cause the first and the second gyromagnetic isotopes to precess. A magnetic field error controller configured to measure an error associated with a magnitude of the magnetic field and to generate an error signal that is fed back to the magnetic field generator to maintain the magnetic field at a desired magnitude. The system further includes a mechanization processor configured to calculate a rotation angle about a sensitive axis of the NMR gyroscope system based on a measured precession angle of at least one of the first and second gyromagnetic isotopes and the error signal. | 07-26-2012 |
20120215474 | CALIBRATION SYSTEM FOR SIMULTANEOUS CALIBRATION OF MULTIPLE MOTION CAPTURE ELEMENTS - A calibration system for simultaneous calibration of multiple motion capture elements (MCEs) of at least one type (accelerometer and/or gyroscope). Includes motion and/or rotational element coupled to a base and configured to move and/or rotate multiple MCEs mounted on a mount in and/or about at least one axis. For one axis movement embodiments, after each motion and/or axial rotation, the motion and/or rotational mount itself is rotated for example manually, so the mount points in a different direction, i.e., the Z axis. In a single axis embodiment, this is performed twice so that each axis of the MCEs experience motion and/or rotation about three axes. The motion capture data is sampled and used in calculation of a 3×3 calibration matrix. The physical format of the motion capture sensors may be any format including chip, memory or SIM card format, PCB format, mobile computers/phones. | 08-23-2012 |
20120239331 | CRANE JIB ATTITUDE AND HEADING REFERENCE SYSTEM AND METHOD - Methods and apparatus are provided for determining the attitude and heading angle of a crane jib. Crane jib angular velocity, crane jib roll angle, crane jib pitch angle, crane jib specific force, and magnetic field in the local operating environment of the crane jib are all sensed and supplied to a processor. All of these measurements are processed, in a processor, to estimate the attitude and heading angle of the crane jib. | 09-20-2012 |
20120245874 | METHOD OF OPERATING A MAGNETIC COMPASS ON A MACHINE - A method of determining the heading of an excavator at a worksite uses a magnetic field sensor, mounted on the excavator, inclinometers that provide an indication of the pitch and roll of the excavator, a gyroscopic sensor that senses the rotational rate of the excavator about the Z axis of the magnetic field sensor, and a processor circuit, having an associated memory. A calibration table of data is created and stored using the gyroscopic sensor as the excavator is rotated at a uniform velocity. The sensed indications of the magnetic field from the coordinate reference frame of the sensor are transformed to the local level plane coordinate reference frame using the outputs from the inclinometers. | 09-27-2012 |
20120245875 | METHOD AND SYSTEM FOR A SELF-CALIBRATED MULTI-MAGNETOMETER PLATFORM - A multi-magnetometer device comprises at least two z-axis aligned and physically rotated magnetometer triads utilized for measuring corresponding earth's magnetic field. The magnetic field measurements are utilized to measure rotation measurements of a single orthogonal axis along the 360 degrees of the complete circle without user's assistance and/or magnetometer movement for magnetometer calibration. The multi-magnetometer device may compute its magnetic heading utilizing the magnetic field measurements if no magnetic perturbations are detected. When magnetic perturbations are detected, a perturbation mitigation process may be performed. The rotation measurements may be generated by selectively combining the magnetic field measurements. Hard-iron components are determined utilizing the rotation measurements, and are removed from the magnetic field measurements. Soft-iron components are determined utilizing the hard-iron free magnetic field measurements, and are removed from the hard-iron free magnetic field measurements. The resulting perturbation free magnetic field measurements are utilized to compute magnetic heading. | 09-27-2012 |
20120259572 | SYSTEM AND METHOD FOR GYROSCOPE ERROR ESTIMATION - Methods and systems for compensating for gyroscopic errors. A system uses magnetometers to detect and measure a magnetic field local to a personal navigation device. When the local magnetic field is quasi-static, the rate of change of the magnetic field is combined with the rotational rate of change of the device. This generates an estimated gyroscope error. The error can then be used to correct for time-varying inherent gyroscope errors. | 10-11-2012 |
20120271582 | CRANE JIB ATTITUDE AND HEADING REFERENCE SYSTEM CALIBRATION AND INITIALIZATION - Methods and apparatus are provided for calibrating and initializing/aligning an attitude and heading reference system of a crane jib. Magnetometer measurements are generated using a magnetometer that is attached to the crane jib, while crane jib maneuvers are performed including crane jib slewing. The magnetometer measurements are supplied to a processor that is configured to generate magnetometer calibration parameters using the magnetometer measurements and to initialize and align a plurality of filters. | 10-25-2012 |
20130035889 | METHOD FOR DETECTING THE ROTATION AND DIRECTION OF ROTATION OF A ROTOR - A method for detecting a rotation and a direction of a rotation of a rotor, on which at least one damping element is positioned, wherein two sensors are arranged. The sensors are damped depending on a position of the damping element. After a standardization has been performed, the measurements are taken by observing consecutive rotational angle positions and then standardization rules are applied to the measured decay times of the sensors. Then a vector, which is entered into a coordinate system, is formed from the values. The present vector angle is determined and compared to the value of a suitable prior vector angle. From the result of the comparison, it is determined whether the rotor has performed a rotation and whether the rotation was forward or backward. By repeating the measurements in the rhythm of the scanning frequency, the rotational motions of the rotor can be detected with high accuracy. | 02-07-2013 |
20130035890 | MOVING TRAJECTORY CALIBRATION METHOD AND MOVING TRAJECTORY GENERATION METHOD - A moving trajectory calibration method is applied to receive a moving trajectory signal generated by a writing device while moving on a written plane and includes the following steps of: generating a first axial signal, a second axial signal and a third axial signal according to the moving trajectory signal by a detecting-calibration unit of an orientation calculation module, wherein the written plane is composed of the first axis and the second axis, and the third axis is perpendicular to the written plane; calibrating the first axial signal according to the third axial signal by the detecting-calibration unit, so as to generate a first axial trajectory signal; and calibrating the second axial signal according to the third axial signal by the detecting-calibration unit, so as to generate a second axial trajectory signal. In addition, a moving trajectory generation method is also disclosed. | 02-07-2013 |
20130085698 | Electronic Devices With Calibrated Compasses - Electronic devices may be provided with compasses for detecting the Earth's magnetic field. Electronic devices may be provided with other electronic components. A compass may include a magnetic sensor and control circuitry configured to apply offsets or other compass calibration data to compass data to compensate for magnetic interference from the other electronic components. Other electronic components may include components such as cameras, auto-focus lens mechanisms, light sources, and displays. The control circuitry may be configured to apply compass calibration data that is specific to an electronic component and that is specific to an operational status of the component. The control circuitry may be configured to recognize a replacement electronic component and revert to an average compass calibration correction. The control circuitry may be configured to output interference-corrected compass data to applications running on the electronic device. | 04-04-2013 |
20130096860 | INFORMATION PROCESSING APPARATUS, INFORMATION PROCESSING METHOD, AND COMPUTER READABLE MEDIUM STORING PROGRAM - An information processing apparatus includes an analysis unit, a gathering place determination unit, and a correction unit. The analysis unit analyzes an action history including at least a position of a subject, in accordance with action information obtained by detecting an action of the subject. The gathering place determination unit determines a position of a gathering place where plural subjects including the subject are together, in accordance with position information indicating the position of the subject which is included in the action information. The correction unit corrects position information about the subject, in accordance with the position of the gathering place determined by the gathering place determination unit. | 04-18-2013 |
20130124128 | SELF-CALIBRATION METHOD FOR ANGLE DETECTOR, ANGLE DETECTOR, CIRCUMFERENTIAL SCALE CALIBRATION DEVICE, AND ANGLE DETECTOR CALIBRATION DEVICE - In a self-calibration method of an angle detector, an angle interval between first and second scale reader heads are set, so that a single rotation is not equally divided into an integer number of potions by a value of the angle interval and that a plurality of rotations N are equally divided into M equal portions by the value of the angle interval. Readings by the scale reader heads during N rotations of the divided circle are obtained at a pre-set data sampling interval. From differences in readings by these scale reader heads, data of the sequential two-point method relating to an angle scale error of the divided circle are obtained at the data sampling interval. The scale error of the divided circle at the data sampling interval is calculated by synthesizing the data using the fact that an average of the data for the rotations N reaches approximately zero. | 05-16-2013 |
20130124129 | Magnetormeter Calibration for Navigation Assistance - Visual codes are scanned to assist navigation. The visual code may be a Quick Response (QR) code that contains information useful to calibrating a variety of navigation-based sensors such as gyroscopes, e-compasses, and barometric pressure sensors. Embodiments describe methods for magnetometer calibration and computing sensor orientation relative to users' local frame of reference. The embodiments use an initial yaw estimate, accelerometer, and gyroscope measurements along with other readily available information (the earth's magnetic field intensity, inclination angle, and declination angle). | 05-16-2013 |
20130204565 | Calibration of Vibrating Gyroscope - In a gyroscopic system, a vibrating gyroscope is controlled in gyrometer mode in a control loop. The control loop corresponds to at least one current control for an operating parameter. In the control loop, a modified control to be applied to the gyrometer for said operating parameter is obtained ( | 08-08-2013 |
20130238268 | APPARATUSES AND METHODS FOR CALIBRATING MAGNETOMETER ATTITUDE-INDEPENDENT PARAMETERS - Methods and apparatuses for calibrating attitude-independent parameters of a 3-D magnetometer are provided. A calibration method includes storing and updating data related to a N×9 matrix T and a N×1 matrix U extended for each measurement with an additional row and an additional element, respectively, the additional row and the additional element being calculated based on values measured by the 3-D magnetometer for the respective measurement. The method further includes calculating analytically (1) a symmetric non-orthogonal 3×3 matrix D representing scaling and skew of the 3-D magnetometer measured values and (2) a vector b representing bias of the 3-D magnetometer measured values, using the stored data and a singular value decomposition (SVD) method. | 09-12-2013 |
20130238269 | APPARATUSES AND METHODS FOR DYNAMIC TRACKING AND COMPENSATION OF MAGNETIC NEAR FIELD - A method for tracking dynamic near fields and correcting a magnetic field measured together with an angular position having an unknown yaw offset relative to a gravitational reference system includes calculating a magnetic field difference between a magnetic field based on the measured magnetic field and the angular position, and a previous total magnetic field, estimating current near fields to be a sum of previous near fields and a portion of the calculated magnetic field difference, computing a magnitude difference, and an angular difference between the measured magnetic field corrected using the estimated current near fields and a fixed vector, comparing the magnitude difference and the angle difference with noise, and if the current measured magnetic field is consistent with the previously tracked magnetic near fields, updating the angular position and correcting the measured magnetic field for the current near field effects using the updated angular position. | 09-12-2013 |
20130338955 | Determining and Correcting Error of Positional Vector-Valued Sensors Using a Fixed Angle Calibration Process - Systems and methods described herein relate to the correction of positional vector-valued sensors using a variety of calibration processes including fixed-angle calibration, known-angle calibration, ortho-calibration and 3-axis gimbal calibration further including various weighting schemes to provide fine-tuned functions or interpolated data which may be used for real-time sensor correction calculation or to populate a look-up table of corrected values. | 12-19-2013 |
20140067305 | STABILIZING ORIENTATION VALUES OF AN ELECTRONIC DEVICE - Disclosed are methods and systems for stabilizing orientation values of an electronic device, the orientation values representing an orientation of the electronic device, the method comprising: obtaining first sensor readings from a first sensor; obtaining second sensor readings from a second sensor; evaluating the first sensor readings and the second sensor readings to determine whether the electronic device is stationary; locking the orientation values when the electronic device is stationary; collecting at least one of further first sensor readings and further second sensor readings while the orientation values are locked; determining whether the orientation of the electronic device is changing by more than a threshold amount based on one or more of the further first sensor readings and the further second sensor readings; and unlocking the orientation values for updating based on the further sensor readings when the orientation of the electronic device is changing by more than the threshold amount. | 03-06-2014 |
20140067306 | CONTROLLING SENSOR USE ON AN ELECTRONIC DEVICE - Described are methods and systems for controlling sensor use on an electronic device, the electronic device having a first sensor defining at least one first sensor axis, the method comprising: detecting a first sensor reading; determining an orientation of the electronic device; and, disabling the detection of the first sensor reading in respect an identified first sensor axis when the first sensor reading in respect of the identified first sensor axis is substantially not expected to change for at least a predetermined amount of time. | 03-06-2014 |
20140365154 | COMPASS CALIBRATION - A method that performs a series of interactive operations to calibrate a compass in a mobile device. The method requires a user to move the device to a variety of different orientations. In order to ensure that the device moves to a sufficient number and variety of orientations, the method instructs the user to rotate the device in a series of interactive operations. The interactive operations provide feedback to inform the user how well the user is performing the interactive operations. In some embodiments, the feedback is tactile (e.g., a vibration). In some embodiments the feedback is audible (e.g., a beep or buzz). In some embodiments, the feedback is visual (e.g., an image or images on a video display of the device). The feedback in some embodiments is continuous (e.g., a changing visual display) and in some embodiments is discrete (e.g., the device beeps after taking a good reading). | 12-11-2014 |
20150032399 | HEADING CALIBRATION METHOD AND COMPASS SENSOR USING THE SAME - A heading calibration method, adapted for a compass sensor is provided. The heading calibration method includes the following steps. R data segments are sequentially generated by rotating the compass sensor by a predetermined angle, wherein the data segments includes a plurality of magnetic data respectively. A partial calibration process is executed to calibrate a reference point coordinate according to the magnetic data in r | 01-29-2015 |
20150345476 | SYSTEMS AND METHODS FOR WIND TURBINE NACELLE-POSITION RECALIBRATION AND WIND DIRECTION ESTIMATION - A computer-implemented method for recalibrating nacelle-positions of a plurality of wind turbines in a wind park is implemented by a nacelle calibration computing device including a processor and a memory device coupled to the processor. The method includes identifying at least two associated wind turbines included within the wind park wherein each associated wind turbine includes location information, determining a plurality of predicted wake features for the associated wind turbines based at least partially on the location information of each associated wind turbine, retrieving a plurality of historical performance data related to the associated wind turbines, determining a plurality of current wake features based on the plurality of historical performance data, identifying a variance between the predicted wake features and the current wake features, and determining a recalibration factor for at least one of the associated wind turbines based on the identified variance. | 12-03-2015 |
20160169673 | OFFSET CALCULATION CIRCUIT AND AZIMUTH SENSOR USING THE SAME | 06-16-2016 |
20160195391 | HEADING CONSTRAINTS IN A PARTICLE FILTER | 07-07-2016 |
702093000 | By another sensor | 19 |
20090070058 | Miniaturized smart self-calibration electronic pointing method and system - An innovative configuration of Miniaturized Smart Self-calibration EPD for mortar applications, as the azimuth/heading and elevation measurement device. This innovative EPD configuration uses only two FOGs or DTG and accelerometers and it is self-contained. This leads to a new EPD implementation that produces a small and light device with lower cost and adequate accuracy for the small dismounted mortar applications. | 03-12-2009 |
20090093981 | INTEGRATED TILT COMPENSATED COMPASS IN A SINGLE PACKAGE - A magnetic compass includes a magnetic sensor, an acceleration sensor, respective signal conditioning circuits in electronic communication with the sensors and a microprocessor. These components are arranged and structurally coupled to a single electronic package that supports the sensors, the signal conditioning circuits, and the microprocessor to provide a miniaturized magnetic compass. In addition, a temperature sensor may be coupled to the package to provide temperature compensation for at least some of the above-identified components. | 04-09-2009 |
20090292497 | Real time error determination for inertial instruments - An exemplary inertial measurement apparatus has first and second inertial instruments that are oriented to have parallel sense axes and that produce respective first and second sensed output signals representative of an inertial attribute to be measured. Respective first and second scale factors are used in producing the first and second sensed output signals. Bias errors in the first and second instruments are estimated using the change in state of sign of the first and second scale factors during the first and succeeding time intervals. To facilitate measurement of bias errors in the first and second instruments, a substitute scale factor is determined to be an equivalent of the second scale factor and is based on the first scale factor and a difference between the first and second scale factors. Errors in the second scale factor are calculated based on the first scale factor and the substitute scale factor during first and succeeding time intervals where a sign of one of first and second scale factors changes from one state during the first time interval to the other state during the succeeding time intervals. First and second corrected output signals are generated based on the respective first and second sensed output signals and correction of said second scale factor error. | 11-26-2009 |
20090312974 | INCLINOMETER MEASUREMENT SYSTEM AND METHOD PROVIDING CORRECTION FOR MOVEMENT INDUCED ACCELERATION ERRORS - The present invention includes a system and a method by which the inclination of a machine element, such as a platform, may be sensed, and errors that might otherwise result from tangential and radial acceleration eliminated. The platform defines orthogonal X and Y axes, and a Z axis orthogonal to both the X and Y axes. The platform is rotatable about an axis extending parallel to the Z axis. The system includes an inclinometer, mounted on the platform at a location spaced from the axis of rotation by a distance r, for providing inclinometer outputs indicating acceleration in the X and Y directions, designated as I | 12-17-2009 |
20090326847 | Orientation calculation apparatus, storage medium having orientation calculation program stored therein, game apparatus, and storage medium having game program stored therein - An orientation calculation apparatus obtains data from an input device comprising at least a gyro sensor, an acceleration sensor, and an image pickup means, so as to calculate an orientation of the input device. Firstly, the orientation calculation apparatus calculates an orientation of the input device in accordance with an angular rate detected by the gyro sensor. Secondly, the orientation is corrected in accordance with acceleration data detected by the acceleration sensor. Further, the orientation is corrected in accordance with an image of a predetermined subject to be taken by the image pickup means. | 12-31-2009 |
20100121599 | AUTO-CALIBRATION OF ORIENTATION SENSING SYSTEMS - An electronic device has an orientation sensing system for determining an orientation of the device. The system comprises a magnetometer and an accelero meter. The system further has calibration means to calibrate the sensing system for operational use. The accelerometer supplies measurements used to constrain a range of possible directions of the external magnetic field to be determined. The calibration means numerically solves a set of equations and is equally well useable for a 2D or 3D magnetometer in combination with a 2D or 3D accelerometer. | 05-13-2010 |
20100250177 | ORIENTATION MEASUREMENT OF AN OBJECT - There is provided an object orientation measurement system for improving the accuracy of a first estimate of the orientation of an object to which the system is attached, the system comprising an accelerometer for measuring a first acceleration of the object; and an estimation unit for providing a position or velocity of the object; processing means for comparing the first acceleration and output of the estimation unit to form a correction signal, and for applying the correction signal to the first estimate of the orientation of the object to produce a second estimate of the orientation of the object. | 09-30-2010 |
20110066392 | SYSTEMS AND METHODS FOR CALIBRATION OF GYROSCOPES AND A MAGNETIC COMPASS - Calibration systems and methods simultaneously calibrate a magnetic compass and gyroscopes. An exemplary embodiment rotates the field calibration system. Based upon the rotation sensed by the magnetic compass and the gyroscopes, the field calibration system determines compensation for both the magnetic compass and the gyroscopes. | 03-17-2011 |
20110077889 | SYSTEM AND METHOD OF MAGNETIC COMPASS CALIBRATION - A system and method of determining a magnetic field and magnetic compass calibration is disclosed. One embodiment is a method of determining a magnetic field vector, the method comprising storing, for each of a plurality of sensor orientations, one or more calibration components, determining, for a sensor orientation not included in the plurality of sensor orientations, a magnetic field vector and a gravity vector, iteratively estimating one or more calibration coefficients based on the stored components, the determined magnetic field vector, and the determined gravity vector, wherein the calibration coefficients are updated during each of a plurality of iterations, and determining a sensor-orientation-independent magnetic field vector based on at least one of the calibration coefficients. | 03-31-2011 |
20120136604 | METHOD AND APPARATUS FOR 3D ATTITUDE ESTIMATION - A method and an apparatus for estimating 3D attitude are disclosed. The method comprises following steps. A set of current angular velocity, a set of current magnetic flux and a set of acceleration of a carrier are sensed. A set of estimated attitude angles are estimated according to the set of current angular velocities, a set of history attitude angles and a motion model. A disturbance parameter is calculated according the set of current magnetic flux and a set of history magnetic flux. It is determined whether the disturbance parameter is more than a disturbance threshold or not. If yes, the set of estimated attitude angles are updated according to the set of current accelerations not the set of current magnetic flux. If not, the set of estimated attitude angles are updated according to the set of current accelerations and the set of current magnetic flux. | 05-31-2012 |
20120283977 | DYNAMIC COMPASS CALIBRATION IN A PORTABLE DEVICE - The magnitude of a sensed, raw magnetic field in a portable device is monitored over a given time interval. The monitored magnitude is compared with predetermined criteria. Based on the comparison, recalibration of a compass function is signed. Other embodiments are also described and claimed. | 11-08-2012 |
20130041610 | NAVIGATION ASSISTANCE BASED ON VISUAL CODES - Visual codes are scanned to assist navigation. The visual code may be a Quick Response (QR) code that contains information useful to calibrating a variety of navigation-based sensors such as gyroscopes, e-compasses, and barometric pressure sensors. | 02-14-2013 |
20130245982 | METHODS AND DEVICES FOR DETERMINING ORIENTATION - Methods and electronic devices for determining orientation are described. In one aspect, the present disclosure provides a processor-implemented method of determining a corrected orientation of a gyroscope on an electronic device. The method includes: obtaining a gyroscope reading; determining a first orientation estimate based on the gyroscope reading and a past corrected orientation; determining whether the gyroscope was saturated when the gyroscope reading was obtained; adjusting a saturation correction learning rate for the gyroscope based on the result of the determination of whether the gyroscope was saturated; and determining a corrected orientation based on the first orientation estimate, a second orientation estimate and the saturation correction learning rate. | 09-19-2013 |
20130289915 | AUTOMATIC COMPASS SYSTEM FOR VEHICLE - An automatic compass system for a vehicle includes compass circuitry having a multi-axis compass sensor and associated circuitry. The multi-axis compass sensor includes first and second magnetoresponsive sensing elements. The magnetoresponsive sensing elements and at least a portion of the associated circuitry are established on a common silicon substrate using CMOS technology. The associated circuitry includes at least one of (i) an A/D converter, (ii) a D/A converter, (iii) signal processing circuitry, (iv) memory, (v) signal filtering circuitry, (vi) a display driver. The compass circuitry (i) determines a directional heading of the equipped vehicle responsive to a sensing of a magnetic field by the magnetoresponsive sensing elements and (ii) automatically compensates for a deviating magnetic field. Responsive to the compass circuitry, an information display of the equipped vehicle may display the directional heading of the equipped vehicle. | 10-31-2013 |
20130332098 | METHODS FOR IMPROVED HEADING ESTIMATION - Methods for calibrating a body-worn magnetic sensor by spinning the magnetic sensor 360 degrees to capture magnetic data; if the spin failed to produce a circle contained in an x-y plane fit a sphere to the captured data; determining offsets based on the center of the sphere; and removing the offsets that are in the z-direction. Computing a magnetic heading reliability of a magnetic sensor by determining an orientation of the sensor at one location; transforming the orientation between two reference frames; measuring a first vector associated with the magnetic field of Earth at the location; processing the first vector to generate a virtual vector when a second location is detected; measuring a second vector associated with the magnetic field of Earth at the second location; and calculating the magnetic heading reliability at the second location based on a comparison of the virtual vector and the second vector. | 12-12-2013 |
20140129170 | METHOD FOR ALIGNING A MOBILE DEVICE SURFACE WITH THE COORDINATE SYSTEM OF A SENSOR - An accelerometer in a mobile device is calibrated by taking multiple measurements of acceleration vectors when the mobile device is held stationary at different orientations with respect to a plane normal. A circle is calculated that fits respective tips of measured acceleration vectors in the accelerometer coordinate system. The radius of the circle and the lengths of the measured acceleration vectors are used to calculate a rotation angle for aligning the accelerometer coordinate system with the mobile device surface. A gyroscope in the mobile device is calibrated by taking multiple measurements of a rotation axis when the mobile device is rotated at different rates with respect to the rotation axis. A line is calculated that fits the measurements. The angle between the line and an axis of the gyroscope coordinate system is used to align the gyroscope coordinate system with the mobile device surface. | 05-08-2014 |
20140297213 | AZIMUTH CORRECTION METHOD AND ELECTRONIC DEVICE THEREOF - In various embodiments, the azimuth correction method includes acquiring at the electronic device, an azimuth, determining reliability of a change value of the azimuth, sensing motion of the electronic device based on the reliability, and correcting the azimuth according to the motion. Various embodiments of the invention may include other embodiments. | 10-02-2014 |
20150012234 | DIGITAL MAGNETIC COMPASS COMPENSATION - The invention relates to a method for a field compensation of an electronic compass for influences to a geomagnetic field by magnetic objects in the vicinity of the compass, that is done with acquiring a magnetic field value by a magnetic field sensor and acquiring an inclination with respect to level plane by an accelerometer, in a discrete set of multiple orientations of the compass. | 01-08-2015 |
20160195392 | NAVIGATION ASSISTANCE BASED ON VISUAL CODES | 07-07-2016 |