Combined With Pulse Modulation Patents (Class 342/201)
  • Patent number: 10921424
    Abstract: A radar system for a ground vehicle includes a MIMO system including a plurality of transmitters, a plurality of receivers, and a controller including an interpreter in communication with the plurality of transmitters and the plurality of receivers. The transmitters include a first transmitter and a plurality of second transmitters, and each of the transmitters includes a signal generator in communication with a transmitting antenna that is disposed to transmit a radar signal. Each of the radar signals is a linear-frequency-modulated continuous-wave (LFM-CW) radar signal including a chirp-start portion, and each of the receivers includes a receiving antenna that is disposed to receive reflected radar signals. The transmitters are controllable such that the chirp-start portions of the LFM-CW radar signals from the second transmitters have progressively increasing time delays as compared to the chirp-start portion of the LFM-CW radar signal from the first transmitter.
    Type: Grant
    Filed: October 30, 2017
    Date of Patent: February 16, 2021
    Assignee: GM Global Technology Operations LLC
    Inventors: Oren Longman, Shahar Villeval, Igal Bilik
  • Patent number: 10915717
    Abstract: An apparatus, which allows a radio frequency identification (RFID) reader to recover quickly from transient input to its receiving subsystem when transitioning from writing to an RFID transponder to reading its response. In particular, this apparatus is comprised of muting circuits, which both attenuate transients in its receiving subsystem while writing to a transponder, and help the receiving subsystem settle quickly after experiencing such transients.
    Type: Grant
    Filed: April 23, 2020
    Date of Patent: February 9, 2021
    Assignee: AVID Identification Systems, Inc.
    Inventors: Mark Blair, Martin S. H. Ma
  • Patent number: 10145949
    Abstract: A pulse transmission controller generates transmission timing signals for a high-frequency radar transmission signal in every transmission cycle. A transmission phase shifter gives a transmission signal generated by a modulator phase shifts each corresponding to a transmission cycle on the basis of the transmission timing signals generated at intervals that are equal to the transmission cycle. A reception phase shifter gives a reception signal that is output from an A/D converter reception phase shifts that are opposite in direction to the respective transmission phase shifts given by the transmission phase shifter on the basis of the transmission timing signals generated at intervals that are equal to the transmission cycle.
    Type: Grant
    Filed: June 9, 2016
    Date of Patent: December 4, 2018
    Assignee: PANASONIC CORPORATION
    Inventors: Takaaki Kishigami, Hirohito Mukai, Tadashi Morita
  • Patent number: 9990089
    Abstract: A method of operation of an ultrasonic sensor array includes receiving a receiver bias voltage at a receiver bias electrode of the ultrasonic sensor array to bias piezoelectric sensor elements of the ultrasonic sensor array. The method further includes receiving a transmitter control signal at the ultrasonic sensor array to cause an ultrasonic transmitter of the ultrasonic sensor array to generate an ultrasonic wave. The method further includes generating data samples based on a reflection of the ultrasonic wave. The receiver bias voltage and the transmitter control signal are received from an integrated circuit that is coupled to the ultrasonic sensor array.
    Type: Grant
    Filed: July 15, 2014
    Date of Patent: June 5, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Timothy Dickinson, Lennart Karl-Axel Mathe, Scott McCarthy, Kostadin Dimitrov Djordjev, Louis Dominic Oliveira, Qubo Zhou
  • Patent number: 9971028
    Abstract: Provided is a method and apparatus for detecting a target using radar, the apparatus including a transmitter to generate a frequency modulated continuous waveform (FMCW) of a baseband, convert the FMCW into a signal of a predetermined frequency band, and emit the signal to a target through radar, a receiver to receive the signal reflected from the target through each antenna of a multi-array antenna, and estimate information on the target based on the signal received through each antenna, and a processor to control operations of the transmitter and the receiver.
    Type: Grant
    Filed: January 29, 2015
    Date of Patent: May 15, 2018
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventor: Ki Hyuk Park
  • Patent number: 9952084
    Abstract: A method and a system for evaluating a content of a bin, the method may include: transmitting by multiple acoustic transceiver arrays, a plurality of acoustics pulses in an at least partially overlapping manner towards an expected location of the content to generate an acoustic interference pattern that comprises multiple fringes; detecting by an acoustic transceiver array a first fringe of the acoustic interference pattern and providing a fringe detection signal; and processing the first fringe detection signal to assist in a provision of a first estimate related to the content. A distance between a pair of acoustic transceiver arrays is at least ten times a distance between transducers of a same acoustic transceiver array.
    Type: Grant
    Filed: October 10, 2013
    Date of Patent: April 24, 2018
    Assignee: APM AUTOMATION SOLUTIONS LTD
    Inventors: Yossi Zlotnick, Avishai Bartov
  • Patent number: 9952318
    Abstract: A method and a system for evaluating a content of a bin, the method may include: transmitting at a first point in time and by a first acoustic transceiver array, a first acoustic pulse; receiving by a second acoustic transceiver array an echo of the first acoustic pulse; and processing the echo of the first acoustic pulse to assist in a provision of a first estimate related to the content; wherein the second acoustic transceiver array differs from the first transceiver array; wherein a distance between the first and second acoustic transceiver array is at least ten times a distance between transducers of the second acoustic transceiver array.
    Type: Grant
    Filed: October 10, 2013
    Date of Patent: April 24, 2018
    Assignee: APM AUTOMATION SOLUTIONS LTD
    Inventors: Avishai Bartov, Yossi Zlotnick
  • Patent number: 9859993
    Abstract: Some demonstrative embodiments include devices, systems and/or methods of communicating filter information. For example, a device may include a wireless communication unit to perform the functionality of a first station (STA) to communicate with a second STA, the wireless communication unit is to communicate filter information including Transmit (Tx) filter information, the Tx filter information representing one or more Tx filter parameters of one or more Tx filters utilized by at least one STA selected from the group consisting of the first STA and the second STA.
    Type: Grant
    Filed: November 20, 2012
    Date of Patent: January 2, 2018
    Assignee: INTEL CORPORATION
    Inventors: Yuval Amizur, Uri Schatzberg, Leor Banin
  • Patent number: 9739873
    Abstract: A system, apparatus, and method for receiving a signal. In one implementation, the system includes a receiver, a correlator, and a range sidelobe envelope generator. The receiver receives the signal. The correlator compresses the signal with a reference signal. The range sidelobe envelope generator generates a range sidelobe envelope function based on the compressed signal.
    Type: Grant
    Filed: August 19, 2014
    Date of Patent: August 22, 2017
    Assignee: NAVICO HOLDING AS
    Inventors: Lindsay Lilburn, Roger Phillips
  • Patent number: 9507017
    Abstract: A method for the simultaneous multi-frequency signal processing within a single receiver is presented. The pulse compression or filtering method samples the received signal at a data rate commensurate with the maximum frequency separation of waveforms at separate frequencies being received, but the compression calculations are only performed at a rate commensurate with the bandwidth of each individual transmit waveform set. The method reduces the processor requirements for extracting all available information from these signals.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: November 29, 2016
    Assignee: SRC, INC.
    Inventor: Daniel R. Culkin
  • Patent number: 9465108
    Abstract: A method involves using an echo-ranging system to transmit a continuously repeating linear frequency modulated (LFM) signal through a propagation medium and receive a return signal reflected off of a target, performing signal processing on the return signal for processing intervals shorter in duration than the return signal waveform cycle, extracting detected echo sets from the processing intervals, estimating a time versus delay slope for each of the detected echo sets, estimating a target range-rate using the estimated time versus delay slopes, computing a bias error using the estimated target range-rate, applying timing correction to the detected echo sets to remove the bias error, and using the echo ranging system to transmit the detected echo set to a target tracker system.
    Type: Grant
    Filed: December 3, 2014
    Date of Patent: October 11, 2016
    Assignee: THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY
    Inventor: Douglas J. Grimmett
  • Patent number: 9244164
    Abstract: A method for unambiguous determination of a range to and/or of a relative velocity of an object with respect to a motor vehicle is disclosed. An unambiguity area (RUn) for the range and/or an unambiguity area (VUn) for the relative velocity may be determined by means of a frequency-modulation continuous-wave radar in the motor vehicle, with a predetermined sequence of frequency-modulated signal pulses being transmitted by the frequency-modulation continuous-wave radar in a measurement cycle. Mutually different unambiguity areas (RUn) for the range and/or mutually different unambiguity areas (VUn) for the relative velocity are defined for at least two successive measurement cycles, and the range and/or the relative velocity are/is determined on the basis of, in each case, at least one measured value for the range and/or for the relative velocity from each measurement cycle.
    Type: Grant
    Filed: December 6, 2010
    Date of Patent: January 26, 2016
    Assignee: VALEO Schalter und Sensoren GmbH
    Inventors: Urs Luebbert, Udo Haberland
  • Patent number: 9217790
    Abstract: A radar apparatus transmits a high-frequency transmission signal, and receives a signal of a reflective wave reflected by a target. Given a first code sequence of a first code length, a second code sequence of a second code length which is longer than the first code sequence, and a third code sequence obtained by inverting each code of the first code sequence, a first transmission signal obtained by modulating the first code sequence, a second transmission signal obtained by modulating the second code sequence, a third transmission signal obtained by modulating the third code sequence and a fourth transmission signal obtained by modulating the second code sequence are generated in a first transmission period, a second transmission period, a third transmission period and a fourth transmission period respectively.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: December 22, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Takaaki Kishigami, Yoichi Nakagawa, Hirohito Mukai
  • Patent number: 9134405
    Abstract: A radar apparatus transmits a radio frequency transmission signal from a transmitter antenna in a given transmission period, and receives a signal of a reflected wave reflected by a target via a receiver antenna. The radar apparatus includes a transmission signal generator that generates a first transmission signal obtained by modifying a code having a third sub-code sequence and a fourth sub-code sequence coupled to each other in a first transmission period, and generates a second transmission period obtained by modifying a code having a fifth sub-code sequence and a sixth sub-code sequence coupled to each other in a second transmission period, and a transmitter RF unit that converts the first and second transmission signals into radio frequency transmission signals, and transmits the radio frequency transmission signals from the transmitter antenna.
    Type: Grant
    Filed: July 14, 2011
    Date of Patent: September 15, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Takaaki Kishigami, Yoichi Nakagawa, Hirohito Mukai
  • Patent number: 9128175
    Abstract: An object detection apparatus disposed in a moving body generates a transmission signal of multiple pulse sequences as a plurality of sequences of multiple pulses. A modulation signal of the transmission signal is generated by performing digital modulation on each of the multiple pulse sequences of the transmission signal according to a code sequence. A transmission wave based on the modulation signal is transmitted and a reflected wave of the transmission wave is received by the apparatus. The apparatus further detects a speed of the moving body to determine a length of the code sequence. The apparatus calculates a code correlation value between the modulation signal and a received signal, which is derived from the reflected wave, and performs pulse compression on the received signal based on the code correlation value to generate a pulse-compressed received signal. The apparatus detects an object based on the pulse-compressed received signal.
    Type: Grant
    Filed: June 5, 2012
    Date of Patent: September 8, 2015
    Assignees: DENSO CORPORATION, Nippon Soken, Inc.
    Inventors: Mitsuyasu Matsuura, Toshihiro Hattori
  • Patent number: 9000974
    Abstract: Systems and methods for allowing dual-mode radar operation. An exemplary transmission system includes a hybrid coupler that receives a signal produced by a synthesizer and couples the received signal to two output ports. A pulse transmitter receives a pulse transmit-activate signal from a controller, receives an input signal from the hybrid coupler and, if the activate signal has been received, amplifies the received signal based on a predefined desired pulse output transmission setting. A frequency-modulation continuous-wave (FMCW) transmitter receives an FMCW transmit-activate signal from the controller, receives an input signal from the hybrid coupler and, if the activate signal has been received, amplifies the received input signal based on a predefined desired FMCW output transmission setting. An isolator protects the pulse transmitter during FMCW operation and also the FMCW transmitter from receiving power reflected off of pulse transmitter components.
    Type: Grant
    Filed: September 24, 2012
    Date of Patent: April 7, 2015
    Assignee: Honeywell International Inc.
    Inventor: David C. Vacanti
  • Patent number: 8830120
    Abstract: An iterative method for modifying an initial time signal to form a created signal having a prescribed envelope, and frequency notches at prescribed frequency values, wherein the created signal closely resembles the initial time signal, the envelope of the created time signal is the prescribed envelope, and the Fourier magnitude of the created time signal at the prescribed frequency values is nearly zero. The created time signal may be a real-valued signal as well as a complex-valued time signal which closely resembles an arbitrary initial time signal, including initial time signals which are standard transmit signals for radar systems, and which have Fourier transform magnitudes with notches and stop-bands at prescribed frequency values. These notches and stop bands are created by enforcing nulls of prescribed order at the prescribed frequency values within the modified time signal.
    Type: Grant
    Filed: November 30, 2011
    Date of Patent: September 9, 2014
    Assignee: C&P Technologies, Inc.
    Inventors: Ivan William Selesnick, Unnikrishna Sreedharan Pillai
  • Publication number: 20140070985
    Abstract: Systems and methods for allowing dual-mode radar operation. An exemplary transmission system includes a hybrid coupler that receives a signal produced by a synthesizer and couples the received signal to two output ports. A pulse transmitter receives a pulse transmit-activate signal from a controller, receives an input signal from the hybrid coupler and, if the activate signal has been received, amplifies the received signal based on a predefined desired pulse output transmission setting. A frequency-modulation continuous-wave (FMCW) transmitter receives an FMCW transmit-activate signal from the controller, receives an input signal from the hybrid coupler and, if the activate signal has been received, amplifies the received input signal based on a predefined desired FMCW output transmission setting. An isolator protects the pulse transmitter during FMCW operation and also the FMCW transmitter from receiving power reflected off of pulse transmitter components.
    Type: Application
    Filed: September 24, 2012
    Publication date: March 13, 2014
    Applicant: HONEYWELL INTERNTIONAL INC.
    Inventor: David C. Vacanti
  • Patent number: 8581778
    Abstract: A non-linear FM pulse compression system includes a non-linear FM transmitter adapted to receive an input signal and transmit an output signal. The non-linear FM transmitter is adapted to modulate the frequency of the output signal by at least one of the following: increasing the frequency of the output signal as a logarithmic function of the frequency of samples in the input signal; modulating the frequency of the output signal in inversely proportional relationship to the frequency of samples in the input signal; and modulating the frequency of the output signal according to a random permutation of the frequency of the input signal. At least one antenna interfaces with the non-linear FM transmitter. A non-linear FM receiver interfacing with the at least one antenna. The non-linear FM receiver is adapted to auto-correlate the output signal with a return signal.
    Type: Grant
    Filed: July 19, 2010
    Date of Patent: November 12, 2013
    Assignee: Scidea Research, Inc.
    Inventor: Pat Sankar
  • Patent number: 8391336
    Abstract: To generate a pulse for ranging, a kernel is convolved with a spreading sequence. The spreading sequence is parametrized by one or more ordered (length, sparsity) pairs, such that the first sparsity differs from the bit length of the kernel and/or a subsequent sparsity differs from the product of the immediately preceding length and the immediately preceding sparsity. Alternatively, a kernel is convolved with an ordered plurality of spreading sequences, all but the first of which may be non-binary. The pulse is launched towards a target. The reflection from the target is transformed to a received reflection, compressed by deconvolution of the spreading sequence, and post-processed to provide a range to the target and/or a direction of arrival from the target.
    Type: Grant
    Filed: March 7, 2011
    Date of Patent: March 5, 2013
    Assignee: A.P.M. Automation Solutions Ltd
    Inventor: Alex Chiskis
  • Publication number: 20120313814
    Abstract: A disturbance signal removing device is provided. The device includes an antenna for transmitting a modulated pulse signal and a non-modulated pulse signal, and a transmission frequency setter for selectively setting as a transmission frequency band of the modulated pulse signal any one of a plurality of mutually different frequency bands of the modulated pulse signal that are different from a transmission frequency band set to the non-modulated pulse signal. The transmission frequency setter switches between the plurality of transmission frequency bands of the modulated pulse signal.
    Type: Application
    Filed: June 8, 2012
    Publication date: December 13, 2012
    Applicant: FURUNO ELECTRIC COMPANY LIMITED
    Inventor: Tatsuya KOJIMA
  • Publication number: 20120249364
    Abstract: A radar emission-reception method including a step of cyclic emission of a group of pulses of different frequency, each frequency being emitted on a different channel and each cycle comprises a single emission phase and a single listening phase and a reception step during which the echoes of each emitted pulse are processed simultaneously and in parallel in different reception frequency channels. Also, a radar making it possible to implement the emission-reception method.
    Type: Application
    Filed: December 29, 2011
    Publication date: October 4, 2012
    Applicant: THALES
    Inventors: Nicolas BON, Jean-Michel QUELLEC
  • Publication number: 20120209113
    Abstract: A non-linear FM pulse compression system includes a non-linear FM transmitter adapted to receive an input signal and transmit an output signal. The non-linear FM transmitter is adapted to modulate the frequency of the output signal by at least one of the following: increasing the frequency of the output signal as a logarithmic function of the frequency of samples in the input signal; modulating the frequency of the output signal in inversely proportional relationship to the frequency of samples in the input signal; and modulating the frequency of the output signal according to a random permutation of the frequency of the input signal. At least one antenna interfaces with the non-linear FM transmitter. A non-linear FM receiver interfacing with the at least one antenna. The non-linear FM receiver is adapted to auto-correlate the output signal with a return signal.
    Type: Application
    Filed: July 19, 2010
    Publication date: August 16, 2012
    Inventor: Pat Sankar
  • Publication number: 20120105273
    Abstract: A radar system including a switching mode power converter. A pulse radar unit is configured to transmit RF pulses with a pulse repetition frequency. The power converter includes a switching controller that is configured to control at least one switching element. The switching controller is configured to receive a frequency modulated input signal. The modulation frequency of the input signal is configured to be derived from the pulse repetition frequency of the radar unit.
    Type: Application
    Filed: July 1, 2009
    Publication date: May 3, 2012
    Applicant: SAAB AB
    Inventor: Bo Nettelblad
  • Patent number: 8112039
    Abstract: A system and method for providing radar signal detection in a communications system. In an example method, a raw energy detect signal is received and analyzed to determine if the raw energy detect signal contains a valid radar pulse. A bit is stored in a bit sequence storage device such that the bit has a first value if a valid radar pulse was detected or a second value indicating that a valid pulse was not detected. A set of bits in the bit sequence storage device are accessed to determine if a plurality of waveform-indicating locations in the bit sequence storage device includes valid pulses. In another aspect of the invention, a system detects a radar signal in a communications device. The system includes a pulse detector to detect pulses in a raw energy signal having a pulse width within a predetermined minimum and maximum pulse width. The system includes a frequency detector having a bit sequence storage device to store the bits output by the pulse detector.
    Type: Grant
    Filed: December 11, 2007
    Date of Patent: February 7, 2012
    Assignee: Xirrus, Inc.
    Inventor: Drew Bertagna
  • Patent number: 7956799
    Abstract: A frequency scanning radar system includes a controller for controlling a frequency generator and a signal processor arranged to determine a Doppler frequency associated with a target. The frequency generator generates three or more sets of signals, each set of signals having a different characteristic frequency and including signals transmitted at a selected rate, and the radar controller selects the rate in substantially direct proportion to the characteristic frequency, whereby to normalize the Doppler frequency determined by the signal processor, such that the normalized Doppler frequency is substantially constant in relation to variation in the carrier frequency. In a frequency modulated radar system, each set of signals includes a sequence of modulation patterns, and the radar controller modifies a given modulation pattern in dependence on the characteristic frequency of the signal being modulated.
    Type: Grant
    Filed: June 4, 2010
    Date of Patent: June 7, 2011
    Assignee: Plextek Limited
    Inventor: David Spreadbury
  • Patent number: 7952516
    Abstract: The present invention is directed to an integrated circuit device that includes a primary signal synthesizer configured to generate a free-running first digital frequency signal and at least one secondary signal synthesizer disposed in parallel with the primary signal synthesizer and configured to generate a free-running at least one second digital frequency signal. A switch element includes a first switch input coupled to the primary signal synthesizer and at least one second switch input coupled to the at least one secondary signal synthesizer. The switch element is configured to select a switch output that provides either the free-running first digital frequency signal or the free-running at least one second digital frequency signal based on a switch control input.
    Type: Grant
    Filed: September 26, 2006
    Date of Patent: May 31, 2011
    Assignee: Lockheed Martin Corporation
    Inventor: Adam T. Atherton
  • Patent number: 7880672
    Abstract: A phase component of a nonlinear frequency modulated (NLFM) chirp radar pulse can be produced by performing digital integration operations over a time interval defined by the pulse width. Each digital integration operation includes applying to a respectively corresponding input parameter value a respectively corresponding number of instances of digital integration.
    Type: Grant
    Filed: September 17, 2007
    Date of Patent: February 1, 2011
    Assignee: Sandia Corporation
    Inventor: Armin W. Doerry
  • Publication number: 20100295721
    Abstract: A radar device has an antenna as well as a switching module, the switching module being designed to set an electric signal to be provided to the antenna in such a way that, depending on the switching, the antenna either emits a continuous modulated radar signal for a long range or a pulsed modulated radar signal for a short range.
    Type: Application
    Filed: August 25, 2008
    Publication date: November 25, 2010
    Inventors: Thomas Focke, Juergen Hasch, Stefan Gaier, Lars Weikert, Thomas Hansen
  • Publication number: 20100295724
    Abstract: A system for detecting the amplitude of radio frequency energy includes: an antenna for receiving the radio frequency energy; a modulator, responsive to a reference frequency signal, for pulse modulating the received radio frequency energy at the reference frequency; a detector for converting such pulse modulated signal to a detector output signal having a low frequency component representative of the amplitude of the received radio frequency energy, in summation with DC bias current, and a high frequency component at the reference signal; and a high pass or band pass filter fed for the detector output signal for passing the high frequency components and for removing the low frequency component. A phase detector, with or without a subsequent IF amplifier, is fed by the reference frequency and the high frequency components for producing an output representative of the high frequency components.
    Type: Application
    Filed: May 21, 2009
    Publication date: November 25, 2010
    Applicant: Raytheon Company
    Inventor: MICHAEL G. ADLERSTEIN
  • Publication number: 20100245161
    Abstract: A frequency scanning radar system includes a controller for controlling a frequency generator and a signal processor arranged to determine a Doppler frequency associated with a target. The frequency generator generates three or more sets of signals, each set of signals having a different characteristic frequency and including signals transmitted at a selected rate, and the radar controller selects the rate in substantially direct proportion to the characteristic frequency, whereby to normalize the Doppler frequency determined by the signal processor, such that the normalized Doppler frequency is substantially constant in relation to variation in the carrier frequency. In a frequency modulated radar system, each set of signals includes a sequence of modulation patterns, and the radar controller modifies a given modulation pattern in dependence on the characteristic frequency of the signal being modulated.
    Type: Application
    Filed: June 4, 2010
    Publication date: September 30, 2010
    Applicant: PLEXTEK LIMITED
    Inventor: David Spreadbury
  • Publication number: 20100220001
    Abstract: A radar imaging system for capturing an image of an object within an area of interest through at least one visual impairment. The radar imaging system comprises at least one radar array. The radar array includes a plurality of transmitter elements and a plurality of receiver elements for receiving a plurality of coded return signals from an object through the at least one visual impairment.
    Type: Application
    Filed: March 17, 2010
    Publication date: September 2, 2010
    Applicant: Teledyne Australia PTY LTD
    Inventor: Ian Dennis LONGSTAFF
  • Patent number: 7737886
    Abstract: A frequency scanning radar system includes a frequency scanning radar controller for use in controlling a frequency generator, the frequency generator being arranged to generate a plurality of sets of signals, each set of signals having a different carrier frequency and comprising a sequence of modulation patterns, transmitted at a selected rate, wherein the radar controller is arranged to select the rate in dependence on the carrier frequency. The system also includes a signal processor arranged to derive tone data from received signals, wherein the signal processor is arranged to process the received signals at a rate dependent on the rate of transmission of the sequence of modulation patterns. Additionally, the system includes an audio system arranged to output audio data derived from signals received by the frequency scanning radar system by playback of the derived tone data at a constant rate.
    Type: Grant
    Filed: May 19, 2008
    Date of Patent: June 15, 2010
    Assignee: Plextek Limited
    Inventor: David Spreadbury
  • Patent number: 7688257
    Abstract: Marine radar systems and methods for producing low power, high resolution range profile estimates. Non-linear Frequency Modulation (NLFM) pulse compression pulses are frequency stepped to form a low power, wide-bandwidth waveform. Periodically, calibration filters are determined and applied to return signals for correcting non-ideal effects in the radar transmitter and receiver.
    Type: Grant
    Filed: March 24, 2009
    Date of Patent: March 30, 2010
    Assignee: Honeywell International Inc.
    Inventors: Paul Christianson, Gloria Logan, Brennan Kilty
  • Patent number: 7679549
    Abstract: It is possible to generate D/A conversion voltage in which an error generated by numeric irregularities of a D/A conversion element such as resistor constituting a D/A converter 11 is corrected. A waveform generation method characterized in that input data into a D/A converter 11 are provided to the D/A converter in order at a timing at which a voltage of a desired waveform which has D/A conversion data indicating a conversion amount of the input data obtained by varying the input data by a minimum conversion unit or a unit obtained by multiplying the minimum conversion unit by an integer, and which varies with time series, becomes substantially equal to a D/A-converted voltage, whereby the D/A-converted voltage is generated in accordance with the desired waveform.
    Type: Grant
    Filed: May 18, 2009
    Date of Patent: March 16, 2010
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Shigeho Inatsune
  • Patent number: 7602331
    Abstract: One aspect of this disclosure relates to a method for processing a received, modulated radar pulse to resolve a radar target from noise or other targets. According to an embodiment of the method, a radar return signal is received and samples of the radar return signal are obtained. A minimum mean-square error (MMSE) pulse compression filter is determined for each successive sample. The MMSE filter is separated into a number of components using contiguous blocking, where each component includes a piecewise MMSE pulse compression filter segment. An estimate of radar range profile is obtained from an initialization stage or a previous stage. The piecewise MMSE pulse compression filter segments are applied to improve accuracy of the estimate. The estimate is repeated for two or three stages to adaptively suppress range sidelobes to a level of a noise floor. Other aspects and embodiments are provided herein.
    Type: Grant
    Filed: August 10, 2007
    Date of Patent: October 13, 2009
    Assignee: University of Kansas
    Inventors: Shannon D. Blunt, Thomas Higgins
  • Patent number: 7564400
    Abstract: It is an object of the present invention to prevent the sensitivity of radar apparatus from falling. A spread spectrum radar apparatus which detects an object, includes a carrier wave oscillator which generates a carrier wave, transmission unit which transmits a spread signal which is the carrier wave spread using a first PN code, an intermediate demodulated signal generating unit which receives a reflected wave which is the spread signal reflected from the object, and despreads the reflected wave using a delayed second PN code that has a cyclically reversed logical value of the first PN code, to generate an intermediate demodulated signal, a low-pass filter through which a specific frequency component of the intermediate demodulated signal passes, and a sampling unit which samples an output signal from the low-pass filter, and the sampling unit samples the output signal in synchronization with the cycle of the reversal.
    Type: Grant
    Filed: September 17, 2008
    Date of Patent: July 21, 2009
    Assignee: Panasonic Corporation
    Inventor: Takeshi Fukuda
  • Patent number: 7548195
    Abstract: It is possible to generate D/A conversion voltage in which an error generated by numeric irregularities of a D/A conversion element such as resistor constituting a D/A converter 11 is corrected. A waveform generation method characterized in that input data into a D/A converter 11 are provided to the D/A converter in order at a timing at which a voltage of a desired waveform which has D/A conversion data indicating a conversion amount of the input data obtained by varying the input data by a minimum conversion unit or a unit obtained by multiplying the minimum conversion unit by an integer, and which varies with time series, becomes substantially equal to a D/A-converted voltage, whereby the D/A-converted voltage is generated in accordance with the desired waveform.
    Type: Grant
    Filed: February 23, 2005
    Date of Patent: June 16, 2009
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Shigeho Inatsune
  • Patent number: 7535408
    Abstract: A method and apparatus is operative for multiple target detection in a radar system which employs a radar waveform of two or more frequency diverse subpulses. The apparatus adds coherent processing of the subpulse echo signals to determine the presence of multiple scattering centers within the radar resolution cell. The subpulses are coherently combined and one can then estimate the number of scattering centers by forming a sample covariance matrix between the subpulse frequency channels and then performing an Eigenvalue decomposition. The resulting Eigenvalues represent the signal strengths of the scattering centers when the associated Eigenvectors correspond to the optimal subpulse weights associated with that signal. A single strong Eigenvalue indicates a single target while two or more strong Eigenvalues or those Eigenvalues larger than the noise related Eigenvalues or a threshold, indicates the presence of multiple targets.
    Type: Grant
    Filed: August 31, 2007
    Date of Patent: May 19, 2009
    Assignee: Lockheed Martin Corporation
    Inventor: Walter A. Kuhn
  • Patent number: 7511665
    Abstract: Method and apparatus for a frequency diverse array. Radio frequency signals are generated by a plurality of independent waveform generators and simultaneously applied to a transmit/receive module. A progressive frequency shift is applied to all radio frequency signals across all spatial channels. Amplitude weighting signals are applied for sidelobe control. Phase control is included for channel compensation and to provide nominal beam steering. The progressive frequency offsets generate a new term which cause the antenna beam to focus in different directions as a function of range.
    Type: Grant
    Filed: October 16, 2007
    Date of Patent: March 31, 2009
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Michael C. Wicks, Paul Antonik
  • Patent number: 7495598
    Abstract: Systems and methods for avoidance of partial pulse interference in radar. The systems and methods include a radar processor for generating control signals that direct the generation and transmission of two consecutive radar pulses using a waveform and pulse train generator and transmitter. The systems and methods also include receiving reflected echoes corresponding to the transmitted pulses using a receiver and processing the echoes using an analog to digital converter, filter, and digital signal processor to separate echoes from each pulse, process them, and combine the results to avoid partial pulse interference while maintaining pulse energy and an acceptable signal to noise ratio.
    Type: Grant
    Filed: April 4, 2006
    Date of Patent: February 24, 2009
    Assignee: Honeywell International Inc.
    Inventor: Bart A. Holmberg
  • Publication number: 20080284641
    Abstract: Embodiments of the invention are concerned with improvements to Doppler radar systems, and are suitable for use with frequency scanning radar systems. In one arrangement the improvements are embodied in a frequency scanning radar controller for use in controlling a frequency generator; the frequency generator is arranged to generate a plurality of sets of signals, each set of signals having a different characteristic frequency and comprising a plurality of signals transmitted at a selected rate, and the radar controller is arranged to select the rate in dependence on the characteristic frequency. The invention can be embodied in a pulsed radar, for which each set of signals comprises a set of pulsed signals and each pulsed signal is repeated at a selected repetition rate. The radar controller is then arranged to modify the repetition rate in dependence on the characteristic frequency of the pulsed signal.
    Type: Application
    Filed: May 19, 2008
    Publication date: November 20, 2008
    Applicant: PLEXTEK LIMITED
    Inventor: David Spreadbury
  • Publication number: 20080198067
    Abstract: The invention relates to a measuring device comprising a transmitter (6) for transmitting (38, 60) a measuring signal (16) that lies within a frequency range, a sensor (8) for receiving (40, 62) an evaluation signal (20) that has been induced by the measuring signal (16) and a control unit (10) for evaluating (42, 66) the evaluation signal (20) to produce a measured result. According to the invention, the function of the control unit (10) is to check the frequency range before the transmission (38, 60) of the measuring signal (16) for the presence of a signal (28) that is independent of the measuring signal (16).
    Type: Application
    Filed: October 19, 2006
    Publication date: August 21, 2008
    Inventors: Reiner Krapf, Heiko Braun, Michael Mahler, Christoph Wieland, Ulli Hoffamann
  • Publication number: 20080136704
    Abstract: A system and method are described for generating waveforms for use in radar and sonar systems. The system includes waveform generation circuitry a waveform generator and an up-conversion module. The waveform generator generates concatenated pulse waveforms at an IF band. In a given pulse repetition interval (PRI), the concatenated pulse waveforms comprise a first and second pulse types associated with first and second IF frequencies respectively. The up-conversion module up-converts the concatenated pulse waveforms to an RF band to form first and second sets of pulses. In the given PRI, each pulse is up-converted to a different RF frequency, pulses of different lengths are associated with a similar carrier frequency, and at least one pulse from each of the sets of pulses implements frequency diversity.
    Type: Application
    Filed: August 2, 2007
    Publication date: June 12, 2008
    Inventors: Tony Meng Yuen Chan, Mark Gerecke
  • Patent number: 7319427
    Abstract: Method and apparatus for a frequency diverse array. Radio frequency signals are generated and applied to a power divider network. A progressive frequency shift is applied to all radio frequency signals across all spatial channels. Amplitude weighting signals are applied for sidelobe control. Phase control is included for channel compensation and to provide nominal beam steering. The progressive frequency offsets generate a new term which cause the antenna beam to focus in different directions as a function of range. Alternative embodiments generate different waveforms to be applied to each radiating element, permitting the transmission of multiple signals at the same time.
    Type: Grant
    Filed: December 20, 2005
    Date of Patent: January 15, 2008
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Michael C. Wicks, Paul Antonik
  • Publication number: 20070273577
    Abstract: A transmission signal generating unit has a window function calculator that generates a window function that makes all frequencies without a center frequency of an input signal and its adjacent frequencies zero and makes the signal to noise ratio of the center frequency maximum; and a transmission signal generator that generates a transmission signal whose amplitude is modulated in a shape of an envelope curve based on the window function generated by the window function calculator.
    Type: Application
    Filed: May 22, 2007
    Publication date: November 29, 2007
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventor: Mitsuyoshi SHINONAGA
  • Patent number: 7151483
    Abstract: A system and corresponding method for the concurrent operation of multiple radar systems on a common frequency and in the same geographical area includes a waveform generator that specifies certain operating parameters for the transmitted radar pulses. In a first instance, the carrier frequency can include an offset for each radar system. In a second instance, complementary codes can be used for the radar pulses such that each radar system operates with a unique code for substantially reducing the cross-talk between the radar systems. In another instance, both carrier frequency offset and complementary coded waveforms can be used to increase the number of radar systems that operate concurrently. Carrier frequency offset can also be used to combat range-wrap by using different carrier frequencies for adjacent radar pulses.
    Type: Grant
    Filed: February 4, 2005
    Date of Patent: December 19, 2006
    Assignee: Raytheon Company
    Inventors: Reza M. Dizaji, Richard R. McKerracher, Anthony M. Ponsford
  • Patent number: 7148841
    Abstract: A radar device includes a code generator, a transmission section, a reception section, a delay section, a despreading process section, a correlation value detection section, a target detection section, an estimation section, an acquisition section, and a correction section. The estimation section estimates a reception intensity of a reflection wave from a target located at a first distance on a basis of a detected correlation value. The acquisition section acquires a cross-correlation value between the first distance and a second distance, on a basis of the estimated reception intensity of the reflection wave from the target located at the first distance, a delayed despreading code used to detect a correlation value for the first distance and a delayed despreading code used to detect a correlation value for the second distance. The correction section corrects the correlation value for the second distance on a basis of the cross-correlation value.
    Type: Grant
    Filed: March 16, 2005
    Date of Patent: December 12, 2006
    Assignees: Fujitsu Ten Limited, Fujitsu Limited
    Inventors: Kimihisa Yoneda, Masaki Hiromori
  • Patent number: 7081850
    Abstract: A general purpose system and method for transmitting and coherently detecting UWB waveforms is predicated on the formation of conjugate pair of UWB waveforms. The in-phase and conjugate quadrature waveforms are orthogonal to each other and have the same power spectrum so that when squared and added they sum to the modulation envelope of the waveforms. By defining the waveform pair in this manner, a relatively simple and inexpensive transceiver can be used to transmit and receive the waveforms and yet preserve maximum range resolution and recover all possible energy in the returned waveforms. The transceiver transmits the in-phase UWB waveform and the conjugate quadrature UWB waveform with either a known time delay or orthogonal polarization relation. The time delay may be varied to suppress aliased return signals.
    Type: Grant
    Filed: June 3, 2004
    Date of Patent: July 25, 2006
    Assignee: Raytheon Company
    Inventor: James G. Small
  • Patent number: 7064705
    Abstract: A technique and apparatus for increasing the peak output pulse power of a capacitor driven high-power diode and square-loop saturable reactor pulse compression generator or transmitter (such as a Loran-C transmitter or other high power pulse generator) with the aid of a minority carrier sweep-out circuit interposed, within the pulse compression circuit.
    Type: Grant
    Filed: June 25, 2004
    Date of Patent: June 20, 2006
    Inventor: Paul Johannessen