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DETERMINING DISTANCE

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342 - Communications: directive radio wave systems and devices (e.g., radar, radio navigation)

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application numberDescriptionNumber of patent applications / Date published
342124000 Material level within container 66
342146000 Combined with determining direction 56
342128000 With frequency modulation 23
342120000 Altimeter 21
342134000 With pulse modulation 18
342145000 With correlation 10
342127000 Phase comparison 7
342125000 With remote cooperating station 7
342123000 Height finder 5
20090303105Azimuth detecting apparatus and radar apparatus - In an azimuth detecting apparatus, a receiver includes antenna elements arranged at predetermined intervals d. A first signal producer produces, based on reception signals generated by the antenna elements, first signals which are equivalent to signals generated by antenna elements arranged at first intervals d12-10-2009
20120032835THREE-DIMENSIONAL TARGET TRACKING - The invention relates to a three-dimensional target tracking method comprising acquiring a first track generated by a first target location system having a first coverage area, said first track comprising a first position of a first target at a given time in a first relative reference system of the first target location system; acquiring a second track generated by a second target location system having a second coverage area partially overlapping the first coverage area in a coverage region shared by the two target location systems, said second track comprising a second position of a second target at the given time in a second relative reference system of the second target location system; and carrying out a correlation test and, if a same height is determined for the first and second targets, detecting that the first and second targets represent a same single target present in the shared coverage region.02-09-2012
20110285577FORWARD-LOOKING 3D IMAGING RADAR AND METHOD FOR ACQUIRING 3D IMAGES USING THE SAME - Disclosure is a forward-looking 3D imaging radar, comprising: a transmitting unit which generates RF signals to be radiated for observing object in front of the radar; a transmitting antenna which radiates the RF signal generated by the transmitting unit; a receiving antenna which receives signals radiated from the transmitting antenna and reflected by the object in front of the radar; a receiving unit which mixes the signal received by the receiving antenna and the branched signal from the transmitting unit, and converts the signal to digital signal; and a signal processor which controls the operations of the transmitting unit and receiving unit, sends command to the transmitting unit to generate RF signals, receives the digitally converted signal from the receiving unit and extracts phase information of the object in front of the radar, and generates 3D radar image by producing altitude information based on the principle of interferometer.11-24-2011
20080266171Device and method for 3D height-finding avian radar - A height-finding 3D avian radar comprises an azimuthally scanning radar system with means of varying the elevation pointing angle of the antenna. The elevation angle can be varied by employing either an antenna with multiple beams, or an elevation scanner, or two radars pointed at different elevations. Heights of birds are determined by analyzing the received echo returns from detected bird targets illuminated with the different elevation pointing angles.10-30-2008
20100315284METHOD AND APPARATUS FOR COHERENT MARINE RADAR MEASUREMENTS OF PROPERTIES OF OCEAN WAVES AND CURRENTS - A method and apparatus of determining a wave height directional spectrum of an ocean wave field using the intermediate-frequency (IF) signal from marine radars with a rotating antenna, using either a fully coherent or a standard non-coherent transmitter/receiver modified for coherent-on-receive use. The method may include receiving the IF radar ocean surface echo signal for a series of transmit pulses, at a sequence of azimuthal antenna positions, and a number of antenna rotations covering several minutes, then generating a matrix of complex IF signal samples from these, deriving phases for each sample, generating the difference in phase for consecutive azimuths, then Doppler shifts, and finally radial velocities. These are interpolated to a Cartesian-transformed representation cube of samples, a subset of which is Fourier transformed in three dimensions, filtered, and the resulting power spectrum generated is used to derive ocean wave height directional spectra, frequency spectra, and root-mean-squared wave height.12-16-2010
342126000 Triangulation 3
20100295723MULTIPLE OBJECT LOCALISATION WITH A NETWORK OF RECEIVERS - A technique is described for determining the correct locations of a plurality of objects by processing signals emitted by a transmitter and reflected by the objects to a plurality of receivers, No angle or elevation information is used. Object-receiver pair time difference of arrival measurements are made to calculate the time difference of arrival between the signals received at each pair of receivers from each object. Hyperbolic localisation is then performed to identify possible locations for each object. Direct-reflected signal time reception measurements are made for each receiver-object pair to calculate the time difference between the reception by the receiver of the direct signal from the transmitter and the signal reflected by the object. The direct-reflected signal time reception measurements are associated with the object-receiver pair time difference of arrival measurements, and the results are used to identify the correct object positions by associating the locations determined by the hyperbolic localisation to the direct-reflected signal time reception measurements.11-25-2010
20080218404SYSTEM AND METHOD FOR DETERMINING POSITION OF RADAR APPARATUS BASED ON REFLECTED SIGNALS - A system and method for determining position of, for example, a robot based on reflected signals comprises a transmitter for transmitting signals in a number of directions within a range of directions and a receiver for receiving echoes of the signals from any direction in the range. The transmitter has a first rotatable antenna and the receiver has a second rotatable antenna which is mechanically couplable to the second antenna. The received echoes are processed by a processor to derive echo data signals indicative of the distance of the system to one or more reflective surfaces and the direction of the reflective surface(s) relative to the system. The processor is arranged to determine the position of the system relative to a starting position from the derived echo data signals indicative of the distance of the system to the reflective surface(s) and the direction of the reflective surface(s) relative to the system.09-11-2008
20110267220SENSOR NODE POSITIONING IN A SENSOR NETWORK - Systems and methods for positioning sensor nodes in a sensor network are described. A system can include multiple base nodes. The base nodes can have a differential global positioning system. The global positioning system can be used to determine a precise location of the base nodes. Sensor nodes can be placed in locations with respect to the plurality of base nodes using measurement data from at least one of the base nodes. A positional device can provide the position measurement data relative to the base nodes to a user for use in placing the plurality of sensor nodes. A communications system enables electronic communication between the base nodes and the sensor nodes.11-03-2011
Entries
DocumentTitleDate
20100149021APPARATUS FOR ESTIMATING THE HEIGHT AT WHICH A TARGET FLIES OVER A REFLECTIVE SURFACE - There is disclosed a method for estimating the height at which a target flies over a reflective surface.06-17-2010
20090278729ELECTROMAGNETIC PULSE REFLECTOR DETECTION METHOD - Detecting reflectors of an emitted electromagnetic pulse, using a received signal, by time-sampling the received signal and the emitted pulse at a same sampling frequency, each received sample corresponding to a return-trip distance for the emitted pulse between its transmitter and a possible reflector. The sampled received signal is divided by the emitted pulse sampled and temporally translated into an interval of duration equal to the emitted pulse divided into L samples, producing L results of the division. A weighted summing of the L results of the division is calculated, the sets of L weights each having a support on which the weights are not zero, every subinterval of length between L/n and L being the support for at least one set of weights and no support having a length of less than L/n, wherein the sums of the weights of a set all being equal, and n is a nonzero integer such that L/n is greater than or equal to 2. Finally, determining the minimum of the summations, wherein a nonzero minimum characterizes the amplitude of the pulse reflected by a reflector located at the distance corresponding to the start of a time interval being considered.11-12-2009
20130038485DATA ANALYSIS METHOD AND APPARATUS FOR ESTIMATING TIME-AXIS POSITIONS OF PEAK VALUES WITHIN A SIGNAL BASED ON A SERIES OF SAMPLE VALUES OF THE SIGNAL - A series of samples derived by fixed-frequency sampling of a received signal are processed to detect (local) maximum-value and minimum-value samples. For each of the maximum-value samples, a corresponding reference value and a corresponding group of samples are derived. The reference value is set higher than that of a minimum-value sample which adjoins the maximum-value sample, and the corresponding group consists of successively adjacent samples including the maximum-value sample, each having a higher value than the reference value. The estimated time-axis position of a peak value of the received signal is obtained within the range of time-axis positions of the corresponding group.02-14-2013
20110063160DOUBLE PISTON ROD - A distance measuring apparatus for detecting the position of a reflection body in a line structure is provided that includes a sensor device, which has at least one antenna for feeding a transmission signal as an electromagnetic wave into the line structure and for receiving the electromagnetic wave reflected on the reflection body. The sensor device also includes evaluation electronics which are configured to determine the position of the reflection body from the phase difference between the transmitted and the received wave.03-17-2011
20090009383RADAR SYSTEM - A radar system transmits a beam of detection radio waves with a predetermined azimuth width, receives a reflected wave from a target, changes a central azimuth of the beam, and detects the distribution of reception signal strengths at predetermined angular intervals and for each predetermined distance. Then, when the reception signal strength distribution associated with changes in azimuth is expressed in rectangular coordinates, an azimuth corresponding to a vertex of an isosceles triangle that approximates the reception signal strength distribution and has an azimuth width, which is determined by the beam azimuth width, as its base is detected as the central azimuth of the target. Thus, the radar system becomes capable of detecting the azimuth of a target at a resolution capability higher than in the case where the movement of a target cannot be detected at a resolution equal to or less than the beam width of detection radio waves, and higher than in the case where a resolution in the azimuth direction is determined by the sampling interval in the azimuth direction. Moreover, the problem of deviation of the peak position of a reception signal strength from the center of a target can be solved.01-08-2009
20120235856COMMUNICATION PROCESSING DEVICE AND DISTANCE MEASUREMENT METHOD IN COMMUNICATION PROCESSING DEVICE - A radio frequency signal oscillator and an intermediate frequency signal oscillator are incorporated in a communication processing device, and a carrier wave with which an intermediate frequency signal is overlapped is generated using the oscillators and transmitted from an antenna. Mixers separate and extract an I signal and a Q signal from the intermediate frequency signal in the signal received by the antenna. A phase difference detector detects a phase difference of the intermediate frequency signal in a reflected wave to the intermediate frequency signal in the carrier wave using the I signal and the Q signal after the reception of the reflected wave from a tag is started. A distance calculator calculates a distance from the antenna to the tag using the phase difference and a wavelength of the intermediate frequency signal.09-20-2012
20120032834USE OF ACCELEROMETER AND ABILITY TO DISABLE POWER SWITCH FOR TAMPER PROTECTION AND THEFT TRACKING - Embodiments disclosed herein include a sensor device that monitors external activity and that includes functionality to detect tampering of the device itself. When monitoring for tampering, a power switch is disabled. Techniques include detecting relative movement of the sensor device, reporting tampering activity, and executing tamper detection responses. Responses can include tracking geographical movement and/or subsequent tampering activity to assist in recovery of a transported device. Responses can also include adjusting power consumption such as by modifying sensing functionality of the sensor device. Techniques include use of an accelerometer that can be positioned in the sensor device to detect relative movement. Once relative movement meets a predetermined threshold indicating device tampering, the sensor device transmits a notification of such tampering, via a network, or in response to a query from an authorized peer device.02-09-2012
20110298650Signature Matching Method and Apparatus - Described are computer-based methods and apparatuses, including computer program products, for signature matching. In some examples, the method for signature matching includes receiving a first target profile associated with a first data signal, the first data signal associated with a first target object; receiving a second target profile associated with a second data signal, the second data signal associated with the first target object or a second target object; generating a comparison distance utilizing a comparison distance function and based on a comparison of one or more data points associated with the first target profile and one or more data points associated with the second target profile; and determining a signature matching score based on the comparison distance.12-08-2011
20110260910SYSTEM AND METHOD FOR MICROWAVE RANGING TO A TARGET IN PRESENCE OF CLUTTER AND MULTI-PATH EFFECTS - A system for measuring the range to an RFID tag including situations containing high clutter and multi-path signals is disclosed. The system includes an RFID reader; an RFID tag; and a coordinated pulse radar system. In the system the RFID reader causes the tag to respond to received signals in a first backscatter state at a first time and a second backscatter state at a second time. The pulsed radar system transmits short pulses coordinated by the backscatter state of the RFID tag and the system creates a differential signal comprised of the differences between radar signals obtained during the first and second states of the tag to obtain an uncorrupted measure of a round trip time of flight of said radar pulses between the pulse radar system and the RFID tag.10-27-2011
20090184863DETECTION AND COMPENSATION OF TARGET LOSSES WHEN THERE IS A CHANNEL CHANGE - The present invention relates to a method of detecting and correcting the loss of a target lost by the distance sensor installation of a motor vehicle when a target object (07-23-2009
20090289833Sparse array millimeter wave imaging system - An active millimeter-wave imaging system that can provide a means of surmounting the deficiencies of earlier millimeter-wave systems, as well as lowering the system cost substantially. Earlier systems have employed large numbers of individual millimeter-wave receivers in either focal plane arrays or frequency scanned antenna arrays, and these systems have suffered from low frame rate, poor contrast, and relatively low resolution. By employing a sparse array of millimeter-wave transmitters and receivers, covering a relatively large, flat, physical aperture, a low cost and high resolution system can be achieved. By employing active millimeter-wave illumination, contrast and frame rate issues can be mitigated, at long ranges (10's of meters). A new approach, termed Fourier Telescopy, allows the illuminating signals to interrogate the various spatial frequencies of the target, and the image to be reconstructed from these various spatial frequency components.11-26-2009
20090040097RADAR APPARATUS - A radar apparatus includes a receiving means that receives a reflected signal, a beat signal generation means that generates beat signals based on the reflected signal, a correlation matrix generation means that calculates correlation matrices based on the beat signals, a storing means that stores previous correlation matrices, an addition means that calculates addition correlation matrices by adding the correlation matrices to the previous correlation matrices, a detection means that detects a frequency component satisfying a predetermined condition by using the beat signals, an extraction means that extracts an extraction matrix corresponding to the detected frequency from the addition correlation matrices, and a direction calculation means that calculates a direction of the object with respect to the radar apparatus based on the extraction matrix.02-12-2009
20080198064System for measuring physical relationship between vehicle and object - In a radar system installed in a vehicle, a first measuring unit measures a first physical relationship between the vehicle and a first object based on a received first echo signal A second measuring unit measures a second physical relationship between the vehicle and a second object based on a received second echo signal. A failure detector detects whether a failure occurs in each of the first and second measuring units. When it is detected that a failure occurs in one of the first and second measuring units, an alternative control unit causes the other of the first and second measuring units to serve as an alternative to the one of the first and second measuring units to thereby measure a corresponding one of the first and second physical relationships.08-21-2008
20080272958Collision detection system and method of estimating target crossing location - A collision detection system and method of estimating a crossing location are provided. The system includes a first sensor for sensing an object in a field of view and sensing a first range defined as the distance between the object and the first sensor. The system also includes a second sensor for sensing the object in the field of view and sensing a second range defined by the distance between the object and the second sensor. The system further includes a controller for processing the first and second range measurements and estimating a crossing location of the object as a function of the first and second range measurements. The crossing location is estimated using range and range rate in a W-plane in one embodiment and using a time domain approach in another embodiment.11-06-2008
20100156701DETECTION AND RANGING APPARATUS AND METHOD OF DESIGNING DETECTION AND RANGING APPARATUS - A method of designing a detection and ranging apparatus having an M number of transmitting elements and an N number of receiving elements, includes decomposing a desired polynomial equation representing an array factor of a K element sensor array into a first polynomial equation representing an array factor of an M element sensor array and a second polynomial equation representing an array factor of an N element sensor array, determining arrangement of the M number of transmitting elements based on the first polynomial equation, and determining arrangement the N number of receiving elements based on the second polynomial equation, wherein K=M×N, or K≧max(M, N).06-24-2010
20100253568METHOD FOR EXCHANGING RADAR SIGNALS - A method for exchanging radar signals, in which it is provided that for a system having a number of radar transceiver chips, a detection range for radar signals is set for each chip so that a plurality of detection ranges for radar signals is covered for the entire system simultaneously.10-07-2010
20130127653METHOD AND APPARATUS FOR LENGTH MEASUREMENT ON AN ELECTRODE - A device and an apparatus for measuring the length of an electrode (05-23-2013
20110175768RELATIVE VIBRATION MEASUREMENT - A method of detecting motion in a load bearing member on a machine. The method includes positioning a Doppler radar detector on the machine and orienting the Doppler radar detector such that the Doppler radar detector floods the load bearing member transmitted radio frequency signals. The method further includes receiving reflected radio frequency signals from the load bearing member with an antenna and generating intermediate frequency signals based on differences between the transmitted radio frequency signals and the reflected radio frequency signals. The method further includes measuring the intermediate frequency signals.07-21-2011
20100321231RADAR DEVICE - The disclosure provides a radar device, which includes a determination module for extracting received data within a predetermined distance range out of a series of received data for which received signals are sampled, and determining whether the distance range is a distance range where rain-and-snow clutters or white noises are dominant, using the extracted received data.12-23-2010
20080204306Detecting and ranging apparatus and detecting and ranging program product - A detecting and ranging apparatus and a program product obtain a correct relative velocity vector by a simple calculation based on a relative distance etc. obtained by a plurality of detectors such as a radar etc. by including: two relative distance measurement units receiving a reflected wave of a transmitted electromagnetic wave by an object to be detected, and thereby measuring a relative distance to the object to be detected, arranged at with each other different position; and an actual velocity vector calculation unit calculating an actual velocity vector of the object to be detected moving with an angle made in a direction from either relative distance measurement unit to the object to be detected based on the relative distances measured by the relative distance measurement units.08-28-2008
20100026557METHOD AND APPARATUS FOR MEASURING DISTANCE02-04-2010
20100253569Method and arrangement to measure the deflection of a wind turbine blade - A method and arrangement to measure the deflection of a blade of a wind-turbine are provided. The blade comprises a cavity inside the blade. A reflector, which is located inside the cavity of the blade, is coupled by a wireless signal with a distance-measurement-device. The distance-measurement-device uses the wireless signal to measure the distance between the distance-measurement-device and the reflector. A line of sight is established and maintained between the distance-measurement-device and the reflector even when the blade is deflected. The reflector is inclined relative to the line of sight in a way, that a lateral movement of the reflector relative to the line of sight results in a change of the distance between the distance-measurement-device and the reflector, while the lateral movement is caused by an deflection of the blade. The distance-measurement-device is designed to measure the change of the distance, which is used to determine the deflection of the blade.10-07-2010
20120146836MEASUREMENT AGENT, A TAG, A METHOD FOR MEASURING, A METHOD FOR SERVING MEASURING AND A COMPUTER PROGRAM PRODUCT - A measurement agent for measuring a distance from the agent to a tag may include a transmitter and receiver for transmitting and receiving radio wave signals. The agent is arranged for changing the agent transmitter from a particular state wherein the agent transmitter transmits a particular radio wave interrogation signal towards a further state determined by the agent wherein the agent transmitter transmits a further radio wave interrogation signal when a signal behaviour of a received radio wave response signal changes. Further, the measurement agent includes a counter for determining a time period between transmittance of a first radio wave interrogation signal and receipt of a radio wave response signal having a predetermined signal behaviour. The agent also includes a processor for computing a distance between the agent and the tag, based on the determined time period and a multiple number of radio wave interrogation signals.06-14-2012
20120001792Measuring device with a measuring section and a reference section - A measuring device is disclosed. In at least one embodiment, the measuring device includes a waveguide that extends into a bore, wherein the bore and the waveguide contain a medium and wherein the waveguide and the bore are displaceable relative to each other. In at least one embodiment, the measuring device further includes at least one device for coupling in and coupling out of waves into the waveguide, wherein the waves transition from the waveguide into the bore, wherein the waves travel through a measuring section inside the bore, and wherein the waves travel inside the waveguide through a constant reference section.01-05-2012
20120112952SYSTEMS AND METHODS FOR SUPPRESSING AMBIGUOUS PEAKS FROM STEPPED FREQUENCY TECHNIQUES - Signal compensation systems and methods compensate an estimated range profile from a plurality of detected signal returns from a true range profile, wherein the signal returns correspond to an emitted stepped frequency pulse-train. An exemplary embodiment utilizes knowledge of the radar system design to identify locations, predict power levels, and suppress the contributions of stepped-frequency range sidelobes (ambiguous peaks) in the estimated range profile, resulting in a cleaner and more accurate radar display.05-10-2012
20120154202Sensor Assembly And Method Of Measuring The Proximity Of A Machine Component To An Emitter - A microwave sensor assembly includes at least one probe including an emitter configured to generate an electromagnetic field from at least one microwave signal. The emitter is also configured to generate at least one loading signal representative of a loading induced within the emitter by an object positioned within the electromagnetic field. The microwave sensor assembly also includes a signal processing device coupled to the at least one probe. The signal processing device includes a linearizer configured to generate a substantially linear output signal based on the at least one loading signal.06-21-2012
20100188281Direct-Current Blocking Circuit, Hybrid Circuit Device, Transmitter, Receiver, Transmitter-Receiver, and Radar Device - The invention relates to a direct-current blocking circuit, and a hybrid circuit device, a transmitter, a receiver, a transmitter-receiver and a radar device that have the direct-current blocking circuit. A dielectric substrate (07-29-2010
20120313809SIGNAL PROCESSING UNIT AND METHOD - A signal processing unit for accurately estimating from a time-domain signal at least one frequency and corresponding amplitude of at least one complex exponential is provided. The signal processing unit is configured to transform the time-domain signal into a frequency-domain signal, and to detect at least one peak frequency of the frequency-domain signal. The signal processing unit is further configured to determine at least one frequency band of interest corresponding to the at least one peak frequency, and to determine at least one signal-to-noise ratio corresponding to the at least one frequency band of interest. The signal processing unit is further configured to perform at least one subsequent time-domain processing step for accurately estimating the at least one frequency and corresponding amplitude of the at least one complex exponential using the at least one frequency band of interest and/or the at least one signal-to-noise ratio.12-13-2012
20120299766MOVING OBJECT DETECTION SYSTEM - In a system, a detecting module cyclically detects positional information of reflection points of received echoes. A sampling module cyclically samples, from the detected reflection points for each cycle, first and second reflection points. The first and second reflection points are expected to be reflection points of the respective first and second reflective portions of a moving object in front of the system. A first determining module determines whether a distance between the first and second reflection points varies over time. A second determining module determines that the first and second reflection points correspond to reflection points of the respective first and second reflective portions of a single moving object when it is determined that the distance between the first reflection point and the second reflection point is substantially invariant over time.11-29-2012
20120212366SYSTEM AND METHOD FOR SENSING DISTANCE AND/OR MOVEMENT - A method (e.g., a method for measuring a separation distance to a target object) includes transmitting an electromagnetic first transmitted signal from a transmitting antenna toward a target object that is a separated from the transmitting antenna by a separation distance. The first transmitted signal includes a first transmit pattern representative of a first sequence of digital bits. The method also includes receiving a first echo of the first transmitted signal that is reflected off the target object, converting the first echo into a first digitized echo signal, and comparing a first receive pattern representative of a second sequence of digital bits to the first digitized echo signal to determine a time of flight of the first transmitted signal and the echo.08-23-2012
20120182175UWB Measuring Device - A UWB measuring device, in particular a hand-held positioning device, includes at least one signal-generating unit for generating at least one first UWB measuring signal, which is intended for a UWB measurement. The signal-generating unit is provided for generating a second measuring signal that differs from the first UWB measuring signal in at least one signal parameter. The second measuring signal is intended to detect a distance from an examination object and/or contact with the examination object.07-19-2012
20110122015 SYSTEM FOR READING INFORMATION TRANSMITTED FROM A TRANSPONDER - A reader device (05-26-2011
20100328141Determination of the Gap Size of a Radial Gap - A method for determining the size of a radial gap between rotating and torsion-proof parts, particularly the parts of a turbomachine is provided. According to the method, an original signal emitted by a transmitter device located on the surface of the rotating part is received in a modified manner by a receiver device disposed on the torsion-proof part and is redirected to an evaluation unit. The evaluation device determines and displays the size of the radial gap from the received signal by determining the parameters of the trajectory of the rotating transmitter device.12-30-2010
20120319890DISTANCE MEASUREMENT USING EHF SIGNALS - A system for sensing proximity using EHF signals may include a communication circuit configured to transmit via a transducer an EM signal at an EHF frequency, and a proximity sensing circuit configured to sense a nearby transducer field-modifying object by detecting characteristics of a signal within the communication circuit. A system for determining distance using EHF signals may include a detecting circuit coupled to a transmitting communication circuit and a receiving communication circuit, both communication circuits being mounted on a first surface. The transmitting communication circuit may transmit a signal toward a second surface, and the receiving communication circuit may receive a signal relayed from the second surface. The detecting circuit may determine distance between the first surface and a second surface based on propagation characteristics of the signals.12-20-2012
20120319889SIGNAL GENERATOR, RADAR DEVICE - A signal generating circuit (or a generator) of an embodiment includes an oscillator to produce an oscillation signal controlled in oscillating frequency by an analog control signal. The circuit includes: a digital phase detector detecting phase information of the oscillation signal and outputting digital phase information; a first differentiator differentiating the digital phase information and outputting digital frequency information; a comparator comparing a frequency setting code setting the oscillating frequency with the digital frequency information and outputting digital frequency error information; and a low-pass filter removing a high-frequency component of the digital frequency error information. The circuit further includes: a D/A converter converting the digital frequency error information of which high-frequency component is removed into analog frequency error information; and an integrator integrating the analog frequency error information, to convert into analog phase error information, and outputting the analog phase error information as the analog control signal.12-20-2012
20120081248SYSTEM AND METHOD FOR ROBUST NAVIGATION AND GEOLOCATION USING MEASUREMENTS OF OPPORTUNITY - A system and method to opportunistically capture and use measurements on a priori unknown radio signals, not intended for radio navigation or geolocation, to improve navigation/geolocation position estimation yield and accuracy.04-05-2012
20100231437SIGNAL PROCESSING AND TIME DELAY MEASUREMENT - Two versions of a binary signal having an irregular sequence of states are processed by deriving (i) a first value which represents the average time derivative of one signal at the times of transitions in the other signal, and (ii) a correlation value for the two signals, and then combining the first value with the correlation value. For a given relative delay introduced between the signals, the resultant combined value indicates whether the introduced delay brings the transitions in the two signals into coincidence. The process can be repeated for other introduced delays to determine the amount of delay between the two signals.09-16-2010
20110273324CONTINUOUS HIGH-ACCURACY LOCATING METHOD AND APPARATUS - Method and apparatus for locating an object (11-10-2011
20080218403High Resolution Ranging Apparatus and Method Using Uwb - Provided is a high resolution distance ranging apparatus using an ultra-wideband (UWB) communication. The apparatus includes: a first spectrum analyzer for extracting a frequency component corresponding to multipath time delay from a reception signal; a second spectrum analyzer for acquiring a noise subspace of the extracted frequency component and extracting a frequency component where maximum power is located from a frequency spectrum based on the noise subspace; a time of arrival (TOA) extractor for extracting TOA based on the frequency component where maximum power is located.09-11-2008
20130176163SYSTEM FOR SENSING AIRCRAFT AND OTHER OBJECTS - A system for sensing aircraft and other objects uses bistatic radar with spread-spectrum signals transmitted from remotely located sources such as aircraft flying at very high altitudes or from a satellite constellation. A bistatic spread spectrum radar system using a satellite constellation can be integrated with a communications system and/or with a system using long baseline radar interferometry to validate the digital terrain elevation database. The reliability and safety of TCAS and ADS-B are improved by using the signals transmitted from a TCAS or ADS-B unit as a radar transmitter with a receiver used to receive reflections. Aircraft and other objects using spread spectrum radar are detected by using two separate receiving systems. Cross-Correlation between the outputs of the two receiving systems reveals whether a noise signal is produced by the receiving systems themselves or is coming from the outside.07-11-2013
20130093616RADAR SENSOR AND METHOD OF DETECTING OBJECT USING THE SAME - A radar sensor and a method of detecting an object by using the same are provided. The method includes: receiving at least one radar signal reflected from the object; converting the received at least one radar signal to at least one signal in a frequency domain; accumulating the converted at least one signal for a predetermined time and extracting at least one feature from the accumulated at least one signal; and identifying the object by comparing the extracted at least one feature with at least one reference value stored in a database.04-18-2013
20130093615SURVEILLANCE SYSTEM AND METHOD - Provided is a surveillance system including a radar transmitter which transmits a detection signal to an object existing within a surveillance region, and at least one radar receiver which is installed separate from the radar transmitter within the surveillance region, receives a signal reflected by the object, and predicts a signal distance of the object which is a sum of a distance from the radar transmitter to the object and a distance from the object to the at least one radar receiver.04-18-2013
20120280852Universal Impedence Probe for Detection of Side-Connections Through Thermoplastic, Thermosetting and Cementitious Liners - A conduit survey apparatus having a carriage capable of movement axially down a conduit. The carrier includes a radio frequency (RF) signal generator and an RF signal detector positioned on the carriage along with a controller controlling the signal generator and signal detector. The carrier further includes a waveguide with an open throat transmitting signals from the signal generator and directing received signals to the signal detector. Finally, the carrier includes a waveguide positioner mounted on the carrier and adapted to selectively engage an interior wall of the conduit, wherein the waveguide guide is connected to the positioner such that the open throat of the waveguide is within about 1 inch of the interior wall when the positioner engages the interior wall.11-08-2012
20130181861SYSTEM AND METHOD FOR ENHANCED POINT-TO-POINT DIRECTION FINDING - A system, device and method that enables units to communicate with each other and point to each other's location without requiring line-of-sight to satellites or any other infrastructure. Further, the system, device and method are able to operate outdoors as well as indoors and overcome multipath interference in a deterministic algorithm, while providing bearings at three dimensions, not only location but actual direction.07-18-2013
20120019409DISTANCE MEASURING APPARATUS AND METHOD FOR CALCULATING A DISTANCE IN A CONDUCTING STRUCTURE - A distance measuring apparatus and method for calculating a distance in a conducting structure are provided. One distance measuring apparatus provides for calculating a distance between a reflection body in a conducting structure and an injection point provided on an end section of the conducting structure for electromagnetic waves is provided. The distance measuring apparatus includes a transmitting and receiving device with a conduction cross-over provided at the injection point for the coaxially-inductive coupling of the transmitting and receiving device to the conducting structure in order to inject an electromagnetic wave into the conducting structure and to decouple the electromagnetic wave reflected on the reflection body from the conducting structure. The distance measuring apparatus also includes an analysis device for calculating a distance between the injection point and the reflection body from the phase difference between the injected electromagnetic wave and the decoupled electromagnetic wave.01-26-2012

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