Having Plural Receivers Patents (Class 342/444)
  • Patent number: 10698077
    Abstract: A computer-implemented method of geolocating a target includes: receiving, from a plurality of sources, a corresponding plurality of angle estimates of the target relative to the respective sources; generating a corresponding plurality of planar renditions of the received angle estimates; selecting a combination of two or more planar renditions whose intersection defines a polygon; in response to multiple such combinations, selecting one having a largest number of planar renditions; and determining a center of the polygon of the selected combination.
    Type: Grant
    Filed: June 26, 2019
    Date of Patent: June 30, 2020
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventor: Mark W. Oden
  • Patent number: 10591613
    Abstract: Relative GPS antenna alignment uses a phase shifter electrically connected to a first GPS antenna. A combiner is electrically connected to the phase shifter, the second GPS antenna and to a GPS receiver. A GPS reception signal (Sig1) emitted by the first GPS antenna is phase-shifted by the phase shifter by a phase shift (?) that can be set by way of a controller and is added by the combiner to a second GPS reception signal (Sig2) emitted by the second GPS antenna. The composite signal (Sum) thus produced is determined for at least three different phase shifts (?). On the basis of these data, the profile of the composite signal (Sum) and the relative alignment of the two GPS antennas in relation to one another is determined.
    Type: Grant
    Filed: July 11, 2013
    Date of Patent: March 17, 2020
    Assignee: KATHREIN-WERKE KG
    Inventor: Robert Bieber
  • Patent number: 9357414
    Abstract: A mobile terminal includes an apparatus configured to perform a method for inter-Radio Access Technology (RAT) measurement. When a measurement condition is satisfied, the apparatus turns on, at an operating module, a standby module and generates a time latch signal to the standby module at a time T0. The apparatus also latches, at the standby module, a time according to the time latch signal and reports the latched time value to the operating module. At the operating module, a measurement request message is sent. The measurement request message includes measurement parameter information and offset information between the time T0 and antenna switching times T2 and T5 to the standby module. The apparatus sets, at the standby module, a time interrupt using the information of the measurement message and performing inter-RAT measurement according to the time interrupt.
    Type: Grant
    Filed: December 10, 2009
    Date of Patent: May 31, 2016
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Hye-Jeong Kim
  • Patent number: 9172481
    Abstract: An electronic system comprising a receiver module and a mobile device, whereby the receiver module is capable of receiving data transmissions from a network of ground stations and buffering the data for future use, and whereby the receiver module provides a means for making requests for access to this buffered data, and the mobile device is capable of generating requests to the receiver module in order to access the buffered data and of displaying the data or playing the data to an operator.
    Type: Grant
    Filed: July 19, 2013
    Date of Patent: October 27, 2015
    Assignee: Appareo Systems, LLC
    Inventors: Jeffrey L. Johnson, Nicholas L. Butts
  • Patent number: 8995902
    Abstract: A method for Link 16-based geolocation of hostile jammers comprising the steps of collecting jamming noise I/Q samples at a plurality of locations, determining the relative time delay of reception between two or more of the locations, determining the first derivative of the time delay of reception between the two or more locations, and using the results calculated in the preceding step to determine the position of the hostile jammers.
    Type: Grant
    Filed: August 10, 2012
    Date of Patent: March 31, 2015
    Assignee: BAE Systems Information and Electronic System Integration Inc.
    Inventor: Joel D. Reiss
  • Patent number: 8948238
    Abstract: Apparatus, the apparatus having at least one processor and at least one memory having computer-readable code stored thereon which when executed controls the at least one processor to perform a method comprising: obtaining in-phase and quadrature samples of a received radio signal at least first and second discrete instances in time; processing the samples to provide information relating to the amplitude and/or phase of the received radio signal at the first and second instances in time; using the amplitude and/or phase information of the received radio signal at the first and second instances in time to determine whether interference is present on the received radio signal; forwarding the complex signal parameters for processing if interference is determined not to be present; and discarding the complex signal parameters without forwarding them for processing if interference is determined to be present.
    Type: Grant
    Filed: November 19, 2010
    Date of Patent: February 3, 2015
    Assignee: Nokia Corporation
    Inventors: Ville Valtteri Ranki, Antti Paavo TapaniKainulainen, Fabio Belloni
  • Patent number: 8791859
    Abstract: High precision radio frequency direction finding systems are described that can determine an angle-of-arrival and geo-location of a RF emitter with respect to a mobile platform. A radio frequency direction finding (RFDF) system for determining a position of a RF emitter with respect to a mobile platform can include an angle-of-azimuth (AoA) system configured to determine an azimuth of a RF emitter with respect to the mobile platform; an attitude measurement system configured to measure the attitude of the mobile platform; a geo-location system configured to calculate the geo-location of the RF emitter; and a processor system configured to calculate a position of the RF emitter.
    Type: Grant
    Filed: November 16, 2011
    Date of Patent: July 29, 2014
    Assignee: Lockheed Martin Corporation
    Inventor: Clayton J. Larson
  • Publication number: 20140152506
    Abstract: A locating device locates a source emitting a short-duration high power microwave pulse. The locating device contains at least three separately disposed receiving antennas that are not disposed on a line, each with an associated detection device for detecting the point in time of the reception at the antenna of the high power microwave pulse. At least one short time measurement device is provided for determining at least two time differences between the points in time of reception of each two of the detection devices. A computing device is provided for calculating a location of the origin of the high power microwave pulse based on at least two of the measured time differences.
    Type: Application
    Filed: December 3, 2013
    Publication date: June 5, 2014
    Applicant: DIEHL BGT DEFENCE GMBH & CO. KG
    Inventors: FRANK SONNENMANN, ADAM UMERSKI
  • Patent number: 8570150
    Abstract: A sensing system includes integrated sensor locating capability. Sensors can transmit spread spectrum encoded data pulses which are received at mobile nodes. Based on time of arrival information and known locations of the mobile nodes, locations of the sensors can be determined.
    Type: Grant
    Filed: January 7, 2009
    Date of Patent: October 29, 2013
    Inventors: Doug Bowen, Thomas R. Giallorenzi, Matt Lake, Sam Kingston
  • Patent number: 8532581
    Abstract: A wireless communication method and apparatus are provided for selecting quality-reporting sub-carrier bands based on sub-carrier band quantity information received from a base station. The method includes generally four steps. First, from a base station, information indicating quantity of sub-carrier bands is acquired. Second, channel quality of each of a plurality of sub-carrier bands within a communication band is measured from a received signal. Third, sub-carrier bands are selected from the plurality of sub-carrier bands, wherein quantity of the selected sub-carrier bands corresponds to the quantity of sub-carrier bands indicated by the acquired information. Fourth, information indicating channel quality of the selected sub-carrier bands is reported to the base station.
    Type: Grant
    Filed: June 22, 2009
    Date of Patent: September 10, 2013
    Assignee: Panasonic Corporation
    Inventors: Akihiko Nishio, Jun Cheng
  • Patent number: 8405550
    Abstract: A system and method for geolocating an RF emitter disposed on or near the ground includes receiving a signal from the RF emitter at each antenna of an array of N non-collinear antennas, wherein N is an integer greater than 2; routing the signal received at each of the antennas to one of a bank of N corresponding receivers; downconverting the N received signals to N downconverted signals; digitizing the N downconverted signals to digitized signals on N corresponding channels; using a processor to determine phase and amplitude variations across the N channels and to determine a Direction Vector corresponding to the signal received from the RF emitter; using a 2-dimensional pre-determined calibration table to look up a best match to the Direction Vector to determine a Bearing Vector to the RF emitter; transforming the Bearing Vector into locally level reference frame; and geolocating the RF emitter by determining an intersection between the locally level reference frame Bearing Vector and a dataset containing lo
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: March 26, 2013
    Assignee: Raytheon Applied Signal Technology, Inc.
    Inventors: Richard P. Gooch, Alan W. Roscow
  • Patent number: 8373596
    Abstract: Techniques are disclosed that allow for the detection and locating of RF emitters. The technique includes recording emitter signals of interest received from the search area via an antenna array and a phase coherent receiver, wherein all frequency conversions carried out by the phase coherent receiver are performed in a phase coherent fashion across all the channels. The technique further includes identifying subspace of each channel using singular value decomposition (SVD), analyzing the subspace of each channel for the presence of a target signal, and direction finding and/or geolocating the target signal.
    Type: Grant
    Filed: April 19, 2010
    Date of Patent: February 12, 2013
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: Steven F. Kimball, Cedric L. Logan
  • Publication number: 20120115623
    Abstract: The invention relates to a locating device for locating an object. The invention also relates to a system of a locating device and of an object, a golf accessory and a golf ball. The locating device comprises a first directional receiver so as to receive the emitted signal. The first directional receiver is directed with a first main axis in a first direction. The reception unit is also provided with a second directional receiver with a second main axis, and also with a third directional receiver with a third main axis. The second and the third main axis are positioned transversely with respect to the first main axis. The locating device is configured for processing the signals received by the at least three directional receivers so as to obtain a location property of the object.
    Type: Application
    Filed: May 27, 2010
    Publication date: May 10, 2012
    Applicant: SATWORLD HOLDING B.V.
    Inventor: John van Driel
  • Patent number: 8050719
    Abstract: Disclosed are a mobile station unit which can obtain azimuth information with a simple construction and a radio communication system including the mobile terminal unit. According to the present invention, in a terminal station, an arrival direction obtaining section 203 obtains an arrival direction of a received azimuth designation signal from a reference station or another terminal station using an arithmetic operation or the like. A transmitting direction forming section 204 determines the direction opposite to the arrival direction obtained by the arrival direction obtaining section 203 as a transmitting direction. A reference azimuth detecting section 207 detects the transmitting direction determined by the transmitting direction forming section 204 as a reference azimuth. An azimuth designation signal generating section 205 generates an azimuth designation signal so as to radiate radio waves having directivity in the transmitting direction determined by the transmitting direction forming section 204.
    Type: Grant
    Filed: November 12, 2008
    Date of Patent: November 1, 2011
    Assignee: Panasonic Corporation
    Inventors: Jun Hirano, Takashi Aramaki, Gen-Ichirou Ohta
  • Patent number: 8031119
    Abstract: In a system for determining the angle of arrival of a target signal received by an array of antenna elements, a pair of receivers simultaneously obtain observations of a received target signal from multiple elements of an array of antenna elements; and a computer processes the simultaneously obtained samples of the target signal to determine a maximum likelihood estimation (MLE) of the angle of arrival ? of the target signal by using the following equation: ?MLE=argmax?Re(?*?). The value of ? is determined in accordance with whether the target signal is known or unknown. When the target signal is unknown, the computer also processes the simultaneously obtained samples of the target signal to estimate the bandwidth of the received target signal by using binary hypotheses and a generalized log likelihood ratio test (GLLRT) or by using multiple hypotheses and pair-wise generalized log likelihood ratio tests.
    Type: Grant
    Filed: July 29, 2009
    Date of Patent: October 4, 2011
    Assignee: L-3 Services, Inc.
    Inventors: James Covosso Francis, David Delaney McGann
  • Patent number: 7961147
    Abstract: A method for determining an angle-of-arrival for a detected signal. The method includes the steps of receiving the signal at a first antenna, receiving the signal at a second antenna, generating a plurality of spectral lines based on a complex multiplication of a complex conjugation of the signal received at the first antenna and the signal received at the second antenna, generating a delta phase difference for pairs of the spectral lines using frequency differences, and generating an angle-of-arrival for the detected signal based on an average of the delta phase difference.
    Type: Grant
    Filed: July 25, 2008
    Date of Patent: June 14, 2011
    Assignee: Rockwell Collins, Inc.
    Inventors: Steven VanLaningham, James A. Stevens
  • Patent number: 7912680
    Abstract: A direction-of-arrival estimation apparatus has a signal vector generation unit operable to generate a signal vector v composed of N baseband signals v1 to vN from arriving signals received from a target by N sensors. The direction-of-arrival estimation apparatus includes a Hankel matrix generation unit operable to preferentially set an order of a column of a matrix at a natural number M where 1?M and M?(N?1)/2 and generate an (N?M)×M matrix Rf1, Rf2, Rb1, or Rb2 from elements v1 to vN-1 of the signal vector. The direction-of-arrival estimation apparatus also includes an estimation unit operable to generate a matrix R using the matrices Rf1, Rf2, Rb1, or Rb2, divide the matrix R into two submatrices R1 and R2 by R=[R1|R2]T, and estimate a direction of arrival of the arriving signal based on the submatrices R1 and R2.
    Type: Grant
    Filed: November 26, 2008
    Date of Patent: March 22, 2011
    Assignee: Fujitsu Limited
    Inventor: Kazuo Shirakawa
  • Publication number: 20100321241
    Abstract: Techniques are disclosed for detecting, identifying, and/or geolocating RF communications devices, such as FRS radios, high-power cordless phones, cellular phones, and other wireless communications receiver devices. The techniques exploit a vulnerability present in such devices, and can be used to detect (e.g., up to 300 meters) and geolocate (e.g., within ±3 meters) those devices. The vulnerability is that receiver circuitry of the target devices emanate RF mixing products when flooded with RF energy or suitable stimulus signal. Such a response to a stimulus signal is unexpected or otherwise unintentional, as receiver circuitry is generally not designed to transmit information. The RF frequency, phase, and amplitude of these sideband RF responses can be used to detect and location the devices. The techniques work in the presence of interference, and can be used on devices that are powered on or off.
    Type: Application
    Filed: June 18, 2009
    Publication date: December 23, 2010
    Applicant: BAE SYSTEMS Information and Electronic Systems Integration Inc.
    Inventors: Milton Janosky, Tyler Robinson, John J. Kelly, Peter Dusaitis
  • Publication number: 20100315292
    Abstract: An apparatus for estimating a Direction of Arrival (DOA) of a wideband includes a first signal receiving unit and a second signal receiving unit to receive a wideband signal while satisfying d?Mc/2fs wherein ‘d’ denotes a distance the first signal receiving unit and the second signal receiving unit are spaced apart from each other, ‘c’ denotes the speed of sound, ‘M’ denotes a number of wideband frequencies being a number of fast Fourier transformation (FFT) points of a wideband signal, and ‘fs’ denotes a sampling frequency, and a DOA calculating unit to calculate a DOA (?) using a normalized frequency ( f) which is obtained by performing an FFT on the respective wideband signals transmitted from the first signal receiving unit and the second signal receiving unit, and using the distance d.
    Type: Application
    Filed: April 14, 2010
    Publication date: December 16, 2010
    Applicant: Samsung Electronics, Co., Ltd.
    Inventors: Weiwei CUI, Ki Wan Eom, Hyung-Joon Lim
  • Publication number: 20100085241
    Abstract: A obstacle detection system comprises a transmission antenna operable to radiate a radio frequency (RF) signal and a transmitter operable to control transmission of the RF signal from the antenna. The obstacle detection system also comprises a receiver antenna operable to receive a reflection of the RF signal; and processing circuitry operable to analyze a plurality of characteristics of a radar cross section (RCS) of the received reflection to identify an obstacle and one or more physical attributes of the obstacle.
    Type: Application
    Filed: October 3, 2008
    Publication date: April 8, 2010
    Applicant: HONEYWELL INTERNATIONAL INC.
    Inventors: David W. Meyers, Long Bui, Yi-Chi Shih, Alan G. Cornett
  • Patent number: 7630738
    Abstract: Disclosed are a mobile station unit which can obtain azimuth information with a simple construction and a radio communication system including the mobile terminal unit. According to the present invention, in a terminal station, an arrival direction obtaining section 203 obtains an arrival direction of a received azimuth designation signal from a reference station or another terminal station using an arithmetic operation or the like. A transmitting direction forming section 204 determines the direction opposite to the arrival direction obtained by the arrival direction obtaining section 203 as a transmitting direction. A reference azimuth detecting section 207 detects the transmitting direction determined by the transmitting direction forming section 204 as a reference azimuth. An azimuth designation signal generating section 205 generates an azimuth designation signal so as to radiate radio waves having directivity in the transmitting direction determined by the transmitting direction forming section 204.
    Type: Grant
    Filed: October 24, 2005
    Date of Patent: December 8, 2009
    Assignee: Panasonic Corporation
    Inventors: Jun Hirano, Takashi Aramaki, Gen-Ichirou Ohta
  • Patent number: 7557747
    Abstract: According to typical practice of an inventive radar system, a switching device is capable of activating a receiver array one at a time so that when a receiver is activated the remaining receivers are inactivated. A switch control circuit is pre-programmed with control logic that is based on the counting of radio pulses that are emitted by a signal generator (for transmission by a transmitter). The control logic dictates, via the switching device, the rapid sequential cycling through of the arrayed receivers so that each receiver is activated for the same prescribed period of time, which corresponds to a pre-programmed number N of emitted radio pulses wherein N=[the number of frequencies in the wave table]×[the number of pulse integrations in the wave table]×[1 polarization or 2 polarizations]. Radio pulse input from the receivers is interleaved in a manner associable with individual receivers.
    Type: Grant
    Filed: April 5, 2006
    Date of Patent: July 7, 2009
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Jerry Rosson Smith, Jr., Donald G. Morgan, Paul E. Ransom, Jr.
  • Patent number: 7532154
    Abstract: The frequency modulation radar device includes a transmitting unit (5), M receiving units for receiving a reflected signal as M channels, a mixing unit (7) for mixing the transmitting signal with the M received signals to obtain beat signals for the M channels, a frequency analyzing unit (9) for analyzing the beat signals for the M channels in frequency, and a calculating unit (1) for calculating a distance to a target object and an orientation angle based on frequency analysis results. The calculating unit (1) calculates a noise level from the frequency analysis result, extracts a peak signal of a subject target object in each of the channels based on the calculated noise level to generate a covariance matrix, discriminates between a signal eigenvalue and a noise eigenvalue among M eigenvalues of the covariance matrix, and estimates the number of incident signals based on the number of signal eigenvalues.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: May 12, 2009
    Assignee: Mitsubishi Electric Corporation
    Inventor: Shinsaku Noda
  • Publication number: 20080316085
    Abstract: An apparatus a transmitter section, a receiver section, and a processing module. The transmitter section transmits a plurality of high carrier frequency beamformed signals in a loop manner until a desired number of signals has been transmitted. The receiver section receives the plurality of high carrier frequency beamformed signals and determines reception properties of the plurality of high carrier frequency beamformed signals. The processing module determines at least one of: reflection, absorption, refraction, and pass through based on the reception properties. The processing module then distinguishes an animate entity from an inanimate entity based on the at least one of the reflection, absorption, refraction, and pass through. The processing module then determines position of the animate entity within a given physical area.
    Type: Application
    Filed: May 29, 2008
    Publication date: December 25, 2008
    Applicant: Broadcom Corporation
    Inventors: AHMADREZA (REZA) ROFOUGARAN, Maryam Rofougaran, Nambirajan Seshadri
  • Patent number: 7427954
    Abstract: A direction finding system is used in which a number of adjacent bands are sequentially measured in fast rotation, with the results from each of the bands being FFT processed to provide amplitude and phase information on all of the signals existing within the band. Upon ascertaining that one wishes to do a direction finding process, one merely accesses the information in the delay memory so that direction finding resources are only allocated to signals of interest and such that one does not have to re-do an FFT upon finding a signal of interest.
    Type: Grant
    Filed: May 3, 2005
    Date of Patent: September 23, 2008
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventor: David A. Vaughn, Jr.
  • Publication number: 20080186233
    Abstract: A wireless resource monitoring system and method utilizes a network of deployed radio elements including at least one master radio, a plurality of beacons, and at least one tag. The beacons are placed at known positions. The master radio, the beacons and the tag are in wireless communication with each other. The tag is attached to the resource that is being monitored. A beacon signal is transmitted by the beacons, which includes the identity of the transmitting beacons. The tag receives the beacon signals and measures the signal strength of the beacon signals. The tag then transmits a tag signal, which includes the identity of the transmitting tag, the measured signal strengths of the beacon signals and the identity of the corresponding beacons. The location of the tag is then determined from the tag signal.
    Type: Application
    Filed: March 7, 2008
    Publication date: August 7, 2008
    Applicant: Innerwireless, Inc.
    Inventor: James William McCoy
  • Patent number: 7395084
    Abstract: A communication system with an antenna array having a respective antenna for each of a multitude of communication modules and a control system which seiectiyely reassigns communication over a first of said multitude of communication modules to a second communication module of said multitude of communication modules in response to identification of a predicted interference within a predetermined interference matrix.
    Type: Grant
    Filed: January 24, 2005
    Date of Patent: July 1, 2008
    Assignee: Sikorsky Aircraft Corporation
    Inventor: Donald S. Anttila
  • Publication number: 20080117106
    Abstract: A method and means for correcting for refraction effects of the earth's atmosphere in an emitter geolocation technique for locating an emitter of electromagnetic waves by means of a plurality of receivers, including detecting the times of arrival of electromagnetic waves at the receivers, computing the relative time differences of arrival between the various receivers and estimating therefrom the position of the emitter, and for correcting, by means of an iterative procedure, the detected times of arrival for path length discrepancies caused by refraction in the earth's atmosphere. The receivers are each mounted on a respective airborne platform, and at least three pairs of said receivers are provided.
    Type: Application
    Filed: December 1, 2005
    Publication date: May 22, 2008
    Applicant: BAE Systems plc
    Inventors: Giuseppe Carlos Sarno, Ray Larsen
  • Patent number: 7292831
    Abstract: A transmitter 1 transmits from a transmission antenna 7 a mixture signal containing a radio-frequency (RF)-band modulated signal, and a portion of power of a local oscillation signal used for frequency conversion. Meanwhile, a receiver 8 detects the transmitted signal by means of a reception antenna-detection section 9. In the reception antenna-detection section 9, a plurality of base unit reception circuits 11 are disposed. Each base unit reception circuit 11 includes a planar printed antenna 12 such as a patch antenna, an amplifier circuit 13 formed on a very small planar circuit by means of an MMIC technique, and a mixer circuit 14 serving as a square-law detector. Respective outputs of the base unit reception circuits 11 are power-mixed and fed to the IF signal demodulation section. The IF signal demodulation section 10 demodulate reception data.
    Type: Grant
    Filed: January 9, 2003
    Date of Patent: November 6, 2007
    Assignee: National Institute of Information and Communications Technology
    Inventors: Yozo Shoji, Kiyoshi Hamaguchi, Hiroyuki Tsuji, Hiroyo Ogawa
  • Patent number: 7277046
    Abstract: A single transmit multi-receiver modulation radar modulates radar return signals received through an associated receive-signal path with one of a plurality of differing modulation waveforms having low-cross correlation products. Each receive-signal path may be associated with a different receive direction. The differently modulated return signals from each receive-signal path may be combined and correlations may be performed on the combined and differently modulated radar return signals using the modulation waveforms to locate a target. In some embodiments, the trajectory of the target may be extrapolated and the target's source location may be determined.
    Type: Grant
    Filed: July 8, 2005
    Date of Patent: October 2, 2007
    Assignee: Raytheon Company
    Inventors: Vinh Adams, Wesley Dwelly
  • Patent number: 7213442
    Abstract: Method of arranging transducers, including non-coplanar interferometer antennas on the outer surface of an aircraft, to minimize phase ambiguities when determining the direction of arrival of a signal received by an array of the transducers and emitted by a source remote from the array.
    Type: Grant
    Filed: December 21, 2004
    Date of Patent: May 8, 2007
    Assignee: The Boeing Company
    Inventor: Wayne C. Workman
  • Patent number: 7130243
    Abstract: A method of locating one or more reflectors in an environment crowded with reflectors. A transmitter and multiple receivers are used to obtain reflected signals. Each path of a reflected signal is defined by an ellipse having the transmitter at one focus and a receiver at the other. A reflector is assumed to lie on the ellipse, and an intersection of ellipses is assumed to be a reflector location. The region is iteratively divided into smaller and smaller cells, and a search algorithm is performed to determine whether a given point in each cell lies on an ellipse. A “solution” is a point that lies on the same number of ellipses as the number of receivers.
    Type: Grant
    Filed: January 13, 2006
    Date of Patent: October 31, 2006
    Assignee: Southwest Research Institute
    Inventor: Michael A. Koets
  • Patent number: 6996420
    Abstract: Disclosed are a mobile station unit which can obtain azimuth information with a simple construction and a radio communication system including the mobile terminal unit. According to the present invention, in a terminal station, an arrival direction obtaining section 203 obtains an arrival direction of a received azimuth designation signal from a reference station or another terminal station using an arithmetic operation or the like. A transmitting direction forming section 204 determines the direction opposite to the arrival direction obtained by the arrival direction obtaining section 203 as a transmitting direction. A reference azimuth detecting section 207 detects the transmitting direction determined by the transmitting direction forming section 204 as a reference azimuth. An azimuth designation signal generating section 205 generates an azimuth designation signal so as to radiate radio waves having directivity in the transmitting direction determined by the transmitting direction forming section 204.
    Type: Grant
    Filed: March 24, 2004
    Date of Patent: February 7, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Jun Hirano, Takashi Aramaki, Gen-Ichirou Ohta
  • Patent number: 6989789
    Abstract: A process for locating radio sources by a two-channel high resolution radiogoniometer including a network of a specified number N of sensors. The process multiplexes the signals supplied by the N sensors on the inputs of only two receivers. Then, with the aid of a calculation device coupled to the outputs of the two receivers, the angles of arrival of the waves emitted by the sources are estimated on the basis of an estimation of the covariance matrix of the signals supplied by the two receivers.
    Type: Grant
    Filed: February 23, 2001
    Date of Patent: January 24, 2006
    Assignee: Thales
    Inventors: Anne Ferreol, Jean-Jacques Monot
  • Patent number: 6735524
    Abstract: A method and apparatus for radio navigation and location is disclosed. The method uses an autonomous, on-board micro-inertial navigation system to propagate the state of a station, and an angularly resolvable antenna to measure relative orientation and relative range and to receive estimated state information from one or more companion stations. Optimally estimated state information is used to permit operation in environments that are otherwise hostile to communications between stations.
    Type: Grant
    Filed: December 10, 2002
    Date of Patent: May 11, 2004
    Assignee: The Boeing Company
    Inventors: A. Dorian Challoner, James M. Bornholdt
  • Patent number: 6731955
    Abstract: Disclosed are a mobile station unit which can obtain azimuth information with a simple construction and a radio communication system including the mobile terminal unit. According to the present invention, in a terminal station, an arrival direction obtaining section 203 obtains an arrival direction of a received azimuth designation signal from a reference station or another terminal station using an arithmetic operation or the like. A transmitting direction forming section 204 determines the direction opposite to the arrival direction obtained by the arrival direction obtaining section 203 as a transmitting direction. A reference azimuth detecting section 207 detects the transmitting direction determined by the transmitting direction forming section 204 as a reference azimuth. An azimuth designation signal generating section 205 generates an azimuth designation signal so as to radiate radio waves having directivity in the transmitting direction determined by the transmitting direction forming section 204.
    Type: Grant
    Filed: September 27, 2002
    Date of Patent: May 4, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Jun Hirano, Takashi Aramaki, Gen-Ichirou Ohta
  • Patent number: 6727840
    Abstract: The Electronic Support Measure (ESM) system is disclosed having various embodiments all of which reduce or even eliminate the detrimental effects caused by interference signals commonly generated by CW emitters.
    Type: Grant
    Filed: February 3, 2003
    Date of Patent: April 27, 2004
    Inventor: William B. Sullivan
  • Patent number: 6700536
    Abstract: A system and method are provided that includes at least a pair of spaced antennas having overlapping fields of view. The system further includes at least a pair of receivers respectively coupled to the pair of antennas. Each of the receivers includes a spectral separator having a plurality of output signals. Each of the output signals represents a signal value at one of a plurality of predetermined frequencies. A plurality of analog to digital converters are coupled to a corresponding one of the spectral separators for respectively providing a digital representation of each of the output signals. A digital processor coupled to an output of each of the plurality of analog to digital converters calculates an angle of arrival of the transmitted signal in at least one dimension from the digital representations.
    Type: Grant
    Filed: October 23, 2002
    Date of Patent: March 2, 2004
    Inventor: Richard J. Wiegand
  • Patent number: 6690321
    Abstract: A system is provided for detecting the presence of two or more acoustic sources or targets such as vehicles that are traveling between an array of unattended passive ground sensors, in which the sensors each include a phased-array microphone and processing to determine the bearing to the acoustic target. The bearings from pairs of these sensors are subtracted one from the other to provide a bearing line difference “delta” which is the indicator of the presence of an acoustic target close to the line between the two sensors of the pair. A tripwire threshold indicating the presence of a target is set when the absolute value of this bearing line difference “delta” is greater than, for instance, 150°, with the “delta” being 180° when the target is on the line between the two sensors.
    Type: Grant
    Filed: July 22, 2002
    Date of Patent: February 10, 2004
    Assignee: Bae Systems Information and Electronic Systems Integration Inc.
    Inventor: Stephen Robert Blatt
  • Publication number: 20040021604
    Abstract: A method and system for positioning mobile units using angle measurements taken by neighboring mobile units is disclosed. A selected mobile unit and mobile units in the vicinity of the selected mobile unit are selectively instructed to measure and report information related to the position of the selected mobile unit. The reported information is used to compute a position of the selected mobile unit.
    Type: Application
    Filed: December 3, 2002
    Publication date: February 5, 2004
    Applicant: InterDigital Technology Corporation
    Inventor: Paul Marinier
  • Patent number: 6677893
    Abstract: A method of locating the source of an unknown signal of varying frequency received by receive antennas (16, 18) via relay satellites (12, 14) involves downconversion of received signals to a first intermediate frequency (IF) and band-limiting the downconverted signals. The band-limited signals are constrained to lie within a prearranged acquisition signal bandwidth by adjustment of local oscillator (LO) downconversion frequency to counteract frequency change in the unknown signal. Downconverted signals are offset in time relative to one another using trial values of differential time offset and their correlation is determined for each trial value to provide actual time offset. Compensation is provided for change in correlation phase angle, which results from signals being downconverted experiencing different LO frequencies during the time interval of the trial offset.
    Type: Grant
    Filed: November 19, 2002
    Date of Patent: January 13, 2004
    Assignee: QinetiQ Limited
    Inventors: Robert M Rideout, Paul R Edmonds, Simon R Duck, David P Haworth, Christopher Griffin
  • Patent number: 6670920
    Abstract: The determination of the geographical location of a signal emitter by the coherent, time integrated measurement of received signal wavefront phase differences through a synthetic aperture and the reconstruction of the wavefront of the received signal. The location of an emitter is determined by coherently measuring the phase gradient of an emitted signal at measurement points across a measurement aperture. Each measured phase gradient is integrated to determine a vector having a direction from the measurement point to the signal emitter and an amplitude proportional to the received signal. A figure of merit is determined for each possible location of the signal emitter by integrating each vector with respect to a propagation path between the measurement point of the vector and the possible location of the signal emitter, and the location of the signal emitter is determined as the possible location of the signal emitter having the highest figure of merit.
    Type: Grant
    Filed: August 15, 2002
    Date of Patent: December 30, 2003
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventor: David L. Herrick
  • Patent number: 6639553
    Abstract: A passive/ranging/tracking processing method provides information from passive sensors and associated tracking control devices and GPS/IMU integrated navigation system, so as to produce three dimensional position and velocity information of a target. The passive/ranging/tracking processing method includes the procedure of producing two or more sets of direction measurements of a target with respect to a carrier, such as sets of elevation and azimuth angles, from two or more synchronized sets of passive sensors and associated tracking control devices, installed on different locations of the carrier, computing the range vector measurement of the target with respect to the carrier using the two or more sets of direction measurements, and filtering the range vector measurement to estimate the three-dimensional position and velocity information of the target.
    Type: Grant
    Filed: July 13, 2002
    Date of Patent: October 28, 2003
    Inventors: Ching-Fang Lin, Dong An
  • Patent number: 6618009
    Abstract: A method of determining the location of an unknown source 10 transmitting a signal to satellite relays 14 and 16 comprises receiving replicas of the signal from the relays at receivers 18. The receivers 18 also transmit and receive reference signals via respective relays 14 and 16. All signals are downconverted, digitized and correlated with one another in pairs using a correlation function including a term which compensates for time varying differential frequency offset (DFO). Compensation for time varying differential time offset or time dilation is achieved by replicating or adding to signal samples and applying phase corrections. This procedure enables a correlation maximum and associated measurement results to be obtained despite the effects of relay satellite motion which mitigate against this. Results are used in a prior art geometrical technique to locate the unknown transmitter.
    Type: Grant
    Filed: September 19, 2001
    Date of Patent: September 9, 2003
    Assignee: Qinetiq Limited
    Inventors: Christopher Griffin, Paul R. Edmonds, Simon R. Duck
  • Patent number: 6388604
    Abstract: A pulse Low Probability of Intercept (LPI) signal discriminator has a soft-limiting IF amplifier chain for receiving an IF signal to soft-limit any high-peak IF signals in the IF signal and a high-peak amplitude compressive circuit followed by an integrator which integrates the signal over a predetermined time to produce a high output when a LPI signal is present. The integrator is connected to a threshold detector which outputs a trigger signal when a high output from the integrator is received. In a receiver having a plurality of channels for received signals from a number of antenna, one channel for each antenna, the received signals are down converted to IF signals and applied to analog-to-digital converters (ADCs) which are connected to a digital processor.
    Type: Grant
    Filed: June 19, 2000
    Date of Patent: May 14, 2002
    Assignee: Her Majesty the Queen in right of Canada, as represented by the Minister of National Defence
    Inventor: Jim P. Y. Lee
  • Patent number: 6366240
    Abstract: A system and method for determining the position of an aircraft. An aircraft signal is received by a first antenna and a second antenna, the first antenna being at a known baseline distance from the second antenna. A processor is used to calculate the time difference of arrival range between the second antenna and the aircraft using a common time reference signal. The position of the aircraft is determined by a position determinator based upon the baseline distance between the first and second antennas, the range between the first antenna and the aircraft, and the time difference of arrival range between the second antenna and the aircraft.
    Type: Grant
    Filed: June 14, 2000
    Date of Patent: April 2, 2002
    Assignee: L-3 Communications Corporation
    Inventors: Lamar K. Timothy, Keith R. Branning, Michael L. Ownby
  • Patent number: 6313794
    Abstract: The present invention uses feedback 300 from RF carrier frequency measurements 301 to disassociate the emitter angle-of-arrival component 313 in the ambiguous phase measurement 312 from the initially unknown phase measurement integer ambiguities 314; to then process 302 resolve the ambiguities; and finally to process 303 to obtain the correct emitter AOA. The present invention does this by converting the actual interferometer baselines 315 on which the unassociated pulse 308 phase measurements 304 were made at different emitter frequencies to a baseline set 305 for a single-frequency equivalent interferometer array. This conceptual array has the following property: the phase measurement 306 that would be made on it at the fixed frequency for a signal at the same direction-of-arrival 307 are identical to the actual phase measurements made on the physical array. Because of this equivalency the conceptual array is called the E(equivalent)-array.
    Type: Grant
    Filed: January 19, 2000
    Date of Patent: November 6, 2001
    Assignee: Litton Systems, Inc.
    Inventor: Conrad M. Rose
  • Patent number: 6313781
    Abstract: The present invention relates to multi-function, multi-channel digital receiver architecture for performing three distinct receiver functions including simultaneous intrapulse analysis, direction finding and LPI signal detection; for determining parameters of incoming signals, comprising a plurality of receiver channels, each channel including a respective antenna for receiving the signal; a down-converter for converting the signal to an intermediate frequency (IF) signal; and an analog-to-digital converter operatively coupled to receive the IF signal and to provide a digital signal at a sampling rate, the digital signal being indicative of the amplitude and phase of the received signal in the channel, and a digital processor operatively coupled to receiving the digital signals from each of the plurality of channels for determining the amplitude and phase intrapulse profiles; by combining the amplitude and phase intrapulse profiles from all of the plurality of channels to provide both intrapulse and conventio
    Type: Grant
    Filed: June 19, 2000
    Date of Patent: November 6, 2001
    Assignee: Her Majesty the Queen in right of Canada, as represented by the Minister of National Defence of Her Majesty's Canadian Government
    Inventor: Jim P. Y. Lee
  • Patent number: H2224
    Abstract: A method to passively locate an emitter using two aircraft to form a large baseline interferometer. The basic two element (two aircraft or helicopters) large baseline interferometer includes self-calibration and allows for various configurations for geo-location of ground-based emitters. The two aircraft large baseline interferometer can measure phase difference of arrival (PDOA) to very precisely locate the emitter in angle. Moving emitters can also be located and tracked using the method of the invention with greater accuracy than can be achieved from a single platform.
    Type: Grant
    Filed: October 14, 2005
    Date of Patent: October 7, 2008
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Thomas L. Madden
  • Patent number: H2109
    Abstract: A passive instantaneous microwave signal frequency identifying and angle of arrival identifying system employing a beam steering multiple element antenna coupled through a Butler matrix to a plurality of simplified Fourier transformation radio receivers wherein unit value or near unit value magnitudes of the Kernel function ⅇ - j2 ⁢   ⁢ π ⁢   ⁢ kn N in the receivers' Fourier transformations are used to elude transformation computation complexity and resulting radio receiver size and cost penalties. Limiting amplifiers, a video signal path and direction finding encoding logic are also employed. Airborne military application of the system in electronic warfare direction finding, radar frequency determination and other activities is included.
    Type: Grant
    Filed: April 3, 2002
    Date of Patent: September 7, 2004
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: James B. Y. Tsui, Keith M. Graves