With Variable Pulse Repetition Frequency (prf) Or Pulse Width Patents (Class 342/137)
  • Patent number: 10317529
    Abstract: A light ranging system can include a laser device and an imaging device having photosensors. The laser device illuminates a scene with laser pulse radiation that reflects off of objects in the scene. The reflections can vary greatly depending on the reflecting surface shape and reflectivity. The signal measured by photosensors can be filtered with a number of matched filter designed according to profiles of different reflected signals. A best matched filter can be identified, and hence information about the reflecting surface and accurate ranging information can be obtained. The laser pulse radiation can be emitted in coded pulses by allowing weights to different detection intervals. Other enhancements include staggering laser pulses and changing an operational status of photodetectors of a pixel sensor, as well as efficient signal processing using a sensor chip that includes processing circuits and photosensors.
    Type: Grant
    Filed: June 12, 2018
    Date of Patent: June 11, 2019
    Assignee: Ouster, Inc.
    Inventors: Marvin Shu, Angus Pacala, Mark Frichtl
  • Patent number: 10218449
    Abstract: An open-loop feed-forward cross-correlator noise cancellation device includes a synthesizer to generate a synthesized output clock signal based on a reference clock signal. The open-loop feed-forward cross-correlator noise cancellation device also includes a cross-correlator device coupled to the synthesizer to receive the reference clock signal and the synthesized output clock signal and to cross-correlate the reference clock signal and the synthesized output clock signal to generate a cross-correlated output signal. The open-loop feed-forward cross-correlator noise cancellation device further includes a signal control delay line coupled to the cross-correlator device to generate an anti-phase noise signal based on the cross-correlated output signal to counter uncorrelated phase noise from additional circuitry of the synthesizer.
    Type: Grant
    Filed: February 9, 2018
    Date of Patent: February 26, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Yue Lu, Zuow-Zun Chen, Jeongsik Yang
  • Patent number: 10048363
    Abstract: A radar device comprises a transmitter, a receiver, a first radar image production component, a second radar image production component, a display component, and an echo width adjuster. The transmitter transmits a pulse signal. The receiver receives an echo signal during a transmission and reception period of the pulse signal. The first radar image production component produces a radar image of a first display range on the basis of the echo signal. The second radar image production component produces a radar image of a second display range that is wider than the first display range on the basis of the echo signal. The display component selectively or simultaneously displays the radar image of the first display range and the radar image of the second display range. The echo width adjuster adjusts pulse width of echo included in the radar images or the echo signal according to the display range of the radar image.
    Type: Grant
    Filed: November 5, 2013
    Date of Patent: August 14, 2018
    Assignee: FURUNO ELECTRIC COMPANY LIMITED
    Inventor: Koji Dai
  • Patent number: 9977125
    Abstract: The invention concerns a method for reducing the costs of a satellite remote sensing service. The method comprises providing a satellite remote sensing system that includes only one satellite equipped with a sensor configured to acquire images of areas of the earth's surface, the satellite remote sensing system being designed to provide a satellite remote sensing service based on the images acquired by the sensor on board the satellite. In particular, the satellite follows a predefined orbit around the earth with an orbit repeat cycle shorter than three days, whereby a satellite remote sensing service with very good time performance, excellent interferometric capabilities and with drastically reduced costs is obtained.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: May 22, 2018
    Assignee: THALES ALENIA SPACE ITALIA S.P.A. CON UNICO SOCIO
    Inventors: Fabio Di Giorgio, Andrea Francioni, Alessandro Cricenti
  • Patent number: 9921657
    Abstract: Systems and methods may provide for using one or more radar measurements to detect a gesture of a body part relative to a mobile device and comparing the gesture to one or more known gestures. Additionally, if the gesture corresponds to at least one of the one or more known gestures, an application running on the mobile device may be notified of the gesture. In one example, the one or more radar measurements are obtained from a plurality of ultra-wideband (UWB) radar modules.
    Type: Grant
    Filed: March 28, 2014
    Date of Patent: March 20, 2018
    Assignee: Intel Corporation
    Inventors: Mark E. Sprenger, Paul J. Gwin
  • Patent number: 9810773
    Abstract: Disclosed is a method of mitigating the effects of anomalous propagation in a Radar system, comprising the steps of: receiving a plurality of returns from a plurality of transmit pulses; calculating a difference in magnitude between each of the plurality of returns and its successor; if one of the calculated differences indicates a first step change greater than a first predetermined threshold, calculating a first average magnitude of the returns received after the first step change, and replacing the returns received before the first step change with synthesised returns having a magnitude equal to the first calculated average magnitude.
    Type: Grant
    Filed: December 12, 2013
    Date of Patent: November 7, 2017
    Assignee: BAE SYSTEMS plc
    Inventors: Bryan Robinson, Noel Turner, Philip Trevelyan Edwards
  • Patent number: 9625282
    Abstract: A signal processing apparatus includes an adder and a weighting integrator. The adder receives a first input signal and an integrated signal, and generates a first output signal. The first output signal is obtained by subtracting the integrated signal from the first input signal. The weighting integrator receives the first output signal, and generates the integrated signal. The weighting integrator includes a weighting function generator, a multiplier, and an accumulator. The weighting function generator receives the first output signal. When the first output signal crosses a zero crossing point, the weighting function generator generates a weighting function. The multiplier performs a multiplication on the weighting function and the first output signal. The accumulator is connected to the multiplier for accumulating the product of the weighting function and the first output signal, thereby generating the integrated signal.
    Type: Grant
    Filed: October 31, 2014
    Date of Patent: April 18, 2017
    Assignee: RDC SEMICONDUCTOR CO., LTD.
    Inventor: Ming-Chou Yen
  • Patent number: 9575200
    Abstract: An apparatus for non-invasive subsoil inspection used for verifying the presence of any underground facilities includes a mobile support structure (2) which can be moved in at least one horizontal direction and which supports antennas (A) adapted to transmit an electromagnetic signal towards the soil and to receive the response echoes. An electronic processing unit is adapted to analyze the data acquired by the antennas and to reconstruct an image of the subsoil portion scanned by the machine.
    Type: Grant
    Filed: July 20, 2011
    Date of Patent: February 21, 2017
    Assignee: SIRTI SPA
    Inventors: Nicola Di Buono, Edoardo Cottino
  • Patent number: 9490834
    Abstract: A digital-to-analog converter circuit including a plurality of digital-to-analog converter cells is provided. A first digital-to-analog converter cell of the plurality of digital-to-analog converter cells includes a cell control module configured to provide alternatingly a first voltage and a second voltage to a first electrode of a capacitive element of the first digital-to-analog converter cell based on a digital input signal during a predefined time interval. A second digital-to-analog converter cell of the plurality of digital-to-analog converter cells includes a cell control module configured to provide a third voltage to a first electrode of a capacitive element of the second digital-to-analog converter cell during the predefined time interval.
    Type: Grant
    Filed: February 19, 2016
    Date of Patent: November 8, 2016
    Assignee: Intel IP Corporation
    Inventors: Stephan Leuschner, Michael Fulde, Daniel Sira, Gerhard Knoblinger
  • Patent number: 9482744
    Abstract: A method of operating a pulse-Doppler radar system includes the steps of generating a plurality waveforms, with each waveform comprising a plurality of pulses generated with a staggered pulse repetition frequency (PRF) from pulse to pulse. Received reflected return signals from the generated plurality of waveforms are filtered by a plurality of Doppler filters that span an entire required Doppler visibility range.
    Type: Grant
    Filed: January 23, 2014
    Date of Patent: November 1, 2016
    Assignee: Lockheed Martin Corporation
    Inventors: Brian P. Neary, Peter H. Stockmann
  • Patent number: 9075138
    Abstract: A Doppler radar system that avoids blind ranges, range ambiguities, blind speed and/or Doppler ambiguities. Pulse width, repetition interval and pulse type are varied from pulse to pulse within a coherent processing interval.
    Type: Grant
    Filed: April 23, 2012
    Date of Patent: July 7, 2015
    Assignee: Massachusetts Institute of Technology
    Inventor: William S. Song
  • Patent number: 8884814
    Abstract: A processing method for radar signal with dual pulse repetition frequency, comprising: generating a first transmission signal and a second transmission signal, and perform a transmission process; reflecting a first echo signal and a second echo signal from an object, and converting the first transmission signal and the second transmission signal to a frequency domain information by using 2D (Two Dimension) fast Fourier transform (FFT); and filtering noise in the frequency domain information, and performing a calculation program by using a algorithm to obtain Doppler shift of the object. Thereby, the processing method of the present invention can overcome the bad operation ability of the lower hardware and advance the radar target detection speed restrictions.
    Type: Grant
    Filed: December 6, 2012
    Date of Patent: November 11, 2014
    Assignee: Chung Shan Institute of Science and Technology, Armaments Bureau, M. N.D.
    Inventors: Yao-Hwa Wen, Min-Fang Lo
  • Patent number: 8854254
    Abstract: An ultra-wideband (UWB) radar transmitter apparatus comprises a pulse generator configured to produce from a sinusoidal input signal a pulsed output signal having a series of baseband pulses with a first pulse repetition frequency (PRF). The pulse generator includes a plurality of components that each have a nonlinear electrical reactance. A signal converter is coupled to the pulse generator and configured to convert the pulsed output signal into a pulsed radar transmit signal having a series of radar transmit pulses with a second PRF that is less than the first PRF.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: October 7, 2014
    Assignee: Sandia Corporation
    Inventors: Christopher T. Rodenbeck, Jeffrey Pankonin, Richard E. Heintzleman, Nicola Jean Kinzie, Zorana P. Popovic
  • Patent number: 8811467
    Abstract: A finite sequence of code values is formed, and can be used for example in communications or remote sensing. A code value in said finite sequence of code values has a validity period specific to that code value. There are code values of different validity periods in said finite sequence of code values. Each of said validity periods is longer than or equal to a predetermined minimum baud length.
    Type: Grant
    Filed: June 28, 2010
    Date of Patent: August 19, 2014
    Assignee: Fracticode Ltd.
    Inventor: Juha Vierinen
  • Patent number: 8742978
    Abstract: A method and an arrangement for determining the delay of a signal between a first station and a second station of the arrangement, with the aim of determining the spatial distance between the stations. A first series of first signal pulses is generated in the first station at a first pulse repetition rate f1. A second and a third series of second and third signal pulses is generated in the second station, comprising a second f2 and third pulse repetition rate f3, where f2=f1+?f and f3=f1??f. The second and third series of second and third signal pulses are transmitted to the first station, where the series are correlated with the first series of first signal pulses. The delay of the signal can be determined from the time elapsed between two successive pulses of the signal arising from the correlation.
    Type: Grant
    Filed: July 13, 2010
    Date of Patent: June 3, 2014
    Assignee: Siemens Aktiengesellschaft
    Inventors: Roland Gierlich, Jörg Hüttner, Andreas Ziroff
  • Patent number: 8724677
    Abstract: Provided are a method and apparatus (receiver) of receiving and processing a radio signal in a transmitter-receiver environment. The radio signals are transmitted across a wireless interface using Ultra Wideband (UWB) pulses. A transmitted reference approach is utilized. The radio signal include pairs of UWB pulses with each pair of pulses separated by a fixed time delay. The two pulses are then combined to provide for improved noise immunity.
    Type: Grant
    Filed: October 17, 2013
    Date of Patent: May 13, 2014
    Assignee: University of South Florida
    Inventor: James L. Tucker
  • Patent number: 8692983
    Abstract: Present novel and non-trivial optical, laser-based measuring systems and method are disclosed. An optical, laser-based, or LIDAR measuring apparatus is comprised of a radiation receiver/transmitter, a beam-forming optical element, a beam steering device comprised of a deviation optical element and at least one actuator used to steer the deviation optical element in response to drive signal(s) from a processor.
    Type: Grant
    Filed: September 13, 2011
    Date of Patent: April 8, 2014
    Assignee: Rockwell Collins, Inc.
    Inventors: Mark D. Chapman, Wyatt L. Hendrick, Paul N. Smith, Howard Fein
  • Patent number: 8660219
    Abstract: A radar detector determines whether an input signal is an orthogonally frequency division multiplexed (OFDM) signal or a radar signal by applying at least first and second bandpass filtering operations having substantially non-overlapping passbands to the input signal, each filtering operation having a passband of width substantially less than a relatively large instantaneous bandwidth characteristic of an OFDM signal and substantially greater than a relatively small instantaneous bandwidth characteristic of a radar signal. The detector multiplies power levels of output signals of the first and second filtering operations to form a power product signal and compares the power level of the power product signal with a threshold level and providing an indicating signal in a first state if the power level of the power product signal exceeds the threshold level and otherwise providing said indicating signal in a second state.
    Type: Grant
    Filed: April 3, 2012
    Date of Patent: February 25, 2014
    Assignee: Summit Semiconductor LLC
    Inventor: Kenneth A. Boehlke
  • Patent number: 8654005
    Abstract: Methods for resolving radar ambiguities using multiple hypothesis tracking are described. One such method includes (a) choosing a single waveform for each of a plurality of dwells of a first scan, wherein the single waveforms of consecutive scans are different, (b) generating the first scan using the single waveform for each of the dwells of the first scan, (c) receiving observation data as a result of the first scan, the observation data comprising measured positions of true targets and false targets, (d) generating, using multiple hypothesis tracking, position predictions for true targets and false targets, (e) comparing the predicted positions and measured positions, repeating (a)-(e) until a preselected process condition is met, and determining the true targets based on the results of the comparisons.
    Type: Grant
    Filed: October 14, 2011
    Date of Patent: February 18, 2014
    Assignee: Raytheon Company
    Inventors: Keian Christopher, Samuel S. Blackman, Robert A. Rosen, Robert J. Dempster
  • Patent number: 8625082
    Abstract: A display apparatus is provided which, when projecting a video onto a curved surface of an object for display, can realize an undistorted display of the video. The measuring means outputs the distance information representing the distance to the object. Based on the distance information produced by the measuring means, the curved surface contour is detected with high precision. According to at least the detected curved surface contour distortions, pixels of the display image are unevenly rearranged to correct the video information before it is output. This arrangement realizes an undistorted display of video when the video is projected onto the curved surface of the object.
    Type: Grant
    Filed: September 6, 2012
    Date of Patent: January 7, 2014
    Assignee: Hitachi Consumer Electronics Co., Ltd.
    Inventors: Tomoki Kobori, Satoshi Ouchi, Koji Hirata, Hidehiro Ikeda, Kazuo Shikita
  • Patent number: 8588270
    Abstract: The invention includes a method for transmitting and detecting high speed Ultra Wideband pulses across a wireless interface. The transmitter includes a serializer and pulse generator. The receiver comprises a fixed delay line, multiplier, local serializer (with a sequence matching the transmitter), digital delay lines, low noise amplifier and logic fan-out buffer along with an array of D flip-flop pairs. Each flip-flop pair is enabled, at fixed time increments, to detect signals at a precise time; the timing is controlled by the pseudo-random sequence generated by the local serializer. A local tunable oscillator is controlled by detecting the phase change of the incoming signal and applying compensation to maintain the phase alignment and clock synchronization of the receiver to the clock reference of the transmitter. The invention uses a pair of pulses with a fixed delay and then relies on mixing the two to provide better noise immunity.
    Type: Grant
    Filed: December 4, 2012
    Date of Patent: November 19, 2013
    Assignee: University of South Florida
    Inventor: James L. Tucker
  • Publication number: 20130278455
    Abstract: A Doppler radar system that avoids blind ranges, range ambiguities, blind speed and/or Doppler ambiguities. Pulse width, repetition interval and pulse type are varied from pulse to pulse within a coherent processing interval.
    Type: Application
    Filed: April 23, 2012
    Publication date: October 24, 2013
    Applicant: Massachusetts Institute of Technology
    Inventor: William S. Song
  • Patent number: 8531330
    Abstract: A method and device for recognizing a pulse repetition interval (PRI) modulation type of a radar signal are provided. The method for recognizing a pulse repetition interval (PRI) modulation type includes: extracting time of arrival (TOA) information of pulses aligned in time order from a received radar signal; generating a PRI sequence based on a difference of adjacent TOAs in the TOA information of pulses; generating a difference of PRIs (DPRI) sequence by using a difference of the adjacent PRIs in the PRI sequence; generating respective symbol sequences by using specific partition rules from the PRI sequence and the DPRI sequence; and calculating characteristic factors from the symbol sequences, and comparing the characteristic factors with threshold values for discriminating a PRI modulation type to determine the PRI modulation type. Thus, the PRI modulation type, a promising feature for radar signal identification, can be precisely derived.
    Type: Grant
    Filed: September 12, 2011
    Date of Patent: September 10, 2013
    Assignee: Agency For Defense Development
    Inventors: Kyu-Ha Song, Jin-Woo Han, Byung-Koo Park, Je-Il Jo
  • Publication number: 20130147653
    Abstract: A radar wave sensing apparatus including a rotation element, a nanosecond pulse near-field sensor and a control unit is provided. The nanosecond pulse near-field sensor emits an incident radar wave and receives a reflection radar wave of the incident radar wave hitting on a surface of the rotation element to obtain a repetition frequency variation of the reflection radar wave corresponding to the incident radar wave. The control unit calculates a vibration of the rotation element according to the repetition frequency variation.
    Type: Application
    Filed: June 8, 2012
    Publication date: June 13, 2013
    Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Kuang-I Chang, Sheng-Hang Wang, Yu-Jen Su, Mu-Yu Tsai, Jyun-Long Chen
  • Publication number: 20130141270
    Abstract: An ultra-wideband (UWB) radar transmitter apparatus comprises a pulse generator configured to produce from a sinusoidal input signal a pulsed output signal s having a series of baseband pulses with a first pulse repetition frequency (PRF). The pulse generator includes a plurality of components that each have a nonlinear electrical reactance. A signal converter is coupled to the pulse generator and configured to convert the pulsed output signal into a pulsed radar transmit signal having a series of radar transmit pulses with a second PRF that is less than the first PRF.
    Type: Application
    Filed: September 23, 2011
    Publication date: June 6, 2013
    Inventors: Christopher T. Rodenbeck, Jeffrey Pankonin, Adam Ferguson, Richard E. Heintzleman, Nicola Jean Kinzie, Zorana P. Popovic
  • Patent number: 8432309
    Abstract: A radar system (44) for a vehicle (42) includes a transmit unit (56) and a receive unit (58). The transmit unit (56) includes a single beam antenna (72) for output of a radar signal (74) into a target zone (46). The receive unit (58) includes a single beam antenna (76) for receiving a direct receive signal (78) and an indirect receive signal (80). The receive signals (78, 80) are reflections of the radar signal (74) from an object (34, 36) in the target zone (46). The indirect receive signal (80) is reflected off the object (34, 36) toward a reflective panel (54) of the vehicle (42), and the indirect receive signal (80) is reflected off the reflective panel (54) for receipt at the receive antenna (76). The receive signals (78, 80) are summed to produce a detection signal (81) indicating presence of the object (34, 36) in the target zone (46).
    Type: Grant
    Filed: November 29, 2010
    Date of Patent: April 30, 2013
    Assignee: Freescale Semiconductor, Inc.
    Inventors: James D. MacDonald, Lawrence A. Rubin
  • Patent number: 8410976
    Abstract: An object ranging system operates by transmitting pulses derived from a frequency-swept signal and determining the beat frequency of a combination of the frequency-swept signal and its reflection from an object. A second (or higher) order harmonic is derived from the combination signal. Accordingly, determination of the beat frequency, and hence object range, is significantly enhanced. The frequency sweep is such that frequency changes occur at a substantially higher rate at the beginning of each the pulse repetition interval than at the end. Accordingly, because the frequency changes are concentrated in the period of pulse transmission, even reflections 'from a close object, where the time delay between the source signal and the reflection is very short, will cause a high beat frequency.
    Type: Grant
    Filed: October 24, 2006
    Date of Patent: April 2, 2013
    Assignee: Mitsubishi Electric Corporation
    Inventors: Jerzy Wieslaw Szajnowski, Paul Ratliff, Wojciech Machowski
  • Patent number: 8369442
    Abstract: A transmitter modulator that is operable to modulate signals according to multiple modulation formats includes a first modulator, a second modulator, and a polarization beam combiner. The first modulator encodes a first signal according to a first modulation format. The second modulator encodes a second signal according to a second modulation format, the first signal orthogonally polarized with respect to the second signal. The polarization beam combiner combines the first signal and the second signal for transmission.
    Type: Grant
    Filed: January 12, 2007
    Date of Patent: February 5, 2013
    Assignee: Fujitsu Limited
    Inventors: Olga I. Vassilieva, Takao Naito
  • Patent number: 8351483
    Abstract: Provided are transmitter topology, receiver topology and methods for generating and transmitting a radio signal at a transmitter and detecting and processing a radio signal at a receiver. The radio signals are transmitted across a wireless interface using Ultra Wideband (UWB) pulses. A transmitted reference approach is utilized. The radio signal include pairs of UWB pulses with each pair of pulses separated by a fixed time delay. The two pulses are then combined to provide for improved noise immunity.
    Type: Grant
    Filed: December 18, 2007
    Date of Patent: January 8, 2013
    Assignee: University of South Florida
    Inventor: James L. Tucker
  • Patent number: 8344942
    Abstract: Range and Doppler ambiguities are common in radar, lidar, and acoustic systems. Resolving these ambiguities is important to achieve desirable geolocation and image quality performance in these systems. A new method is described to iteratively resolve the ambiguities. For Doppler ambiguity applications, a first PRF value and an initial Doppler frequency search window are selected. A new PRF is determined based on the ratio of the initial search window to the first PRF. The radar data of the first pair of PRF's is used to determine two modulo Doppler estimates. The modulo Doppler estimates are used to determine a new Doppler estimate with a confidence interval smaller than the first search window. The ratio of the new Doppler search window to the first PRF, is used to determine the next PRF. This process is iterated until the new Doppler search window is less than the first PRF.
    Type: Grant
    Filed: April 29, 2010
    Date of Patent: January 1, 2013
    Assignee: Raytheon Company
    Inventors: Michael Yih-Hwa Jin, Chi-Yung Chang
  • Patent number: 8334800
    Abstract: A radar device includes: a frequency modulating unit for modulating a frequency of a transmission signal by a triangular wave; a transmitting unit for pulsing the frequency modulated transmission signal to transmit the pulsed transmission signal as a transmission pulse; a receiving unit for generating a beat signal based on a frequency difference between a frequency modulated transmission signal and a reflected received pulse; a range gate setting unit for setting a range gate that determines a sampling timing of the received pulse based on a transmitting timing of the transmission pulse; a sampling unit for sampling the beat signal in each of range gates; a distance and relative velocity calculating unit for calculating a distance to a target and a relative velocity based on the sampled beat signal; and a control unit for controlling a transmission pulse width and a range gate width depending on a subject vehicle velocity.
    Type: Grant
    Filed: October 7, 2010
    Date of Patent: December 18, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventor: Kei Hayase
  • Patent number: 8207885
    Abstract: A ground penetrating radar system is described that is able to create both low frequency, wide pulses, and high frequency, narrow pulses, to enable both deep and shallow operation of the ground penetrating radar on demand, including simultaneous operation.
    Type: Grant
    Filed: September 19, 2007
    Date of Patent: June 26, 2012
    Assignee: Niitek, Inc.
    Inventors: Mark Hibbard, Howard Bandell
  • Patent number: 8184040
    Abstract: This disclosure provides a radar device including a transmission module for sequentially transmitting two or more kinds of pulse signals having different pulse widths by a predetermined transmitting pattern, a memory module for storing a predetermined number of pulse reply data corresponding to each kind of the pulse signals, the predetermined number being number of transmissions of the kind of the pulse signals, a pulse integrating module for performing pulse integration of the pulse reply data stored in the memory module for each kind of the pulse signal, and an image generating module for generating a radar image using the results of the pulse integration.
    Type: Grant
    Filed: March 3, 2010
    Date of Patent: May 22, 2012
    Assignee: Furuno Electric Company Limited
    Inventors: Masaya Takase, Hitoshi Maeno
  • Patent number: 8138961
    Abstract: A step frequency inverse synthetic aperture radar (ISAR) includes a transmitter configured to transmit a transmission pulse at a transmission frequency to a near earth object (NEO), the transmission frequency having a frequency range comprising a starting frequency, an ending frequency, and a step size; a receiver configured to receive a pulse response from the NEO, the pulse response corresponding to the transmission pulse; and a computer configured to determine a 3-dimensional image of the interior of the NEO from the pulse response.
    Type: Grant
    Filed: September 17, 2009
    Date of Patent: March 20, 2012
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventor: Manohar D. Deshpande
  • Patent number: 8115672
    Abstract: The present invention relates to a procedure for measuring distance. It applies notably in respect of short-range radars, but not exclusively. The method uses an electromagnetic wave comprising at least one emission sequence (31, 32, 33, 34, 35) of the FSK type, at least two emission frequencies (F1, F2), emitted successively towards the said target a given number p of times inside the sequence. The gap ?F between the emission frequencies (F1, F2) is substantially equal to an integer number k of times the repetition frequency (SPRF) of the cycle of frequencies, the distance measurement being obtained on the basis of the measurement of difference of phases ?? between the signals received corresponding respectively to a first frequency (F1) and to a second frequency (F2).
    Type: Grant
    Filed: February 2, 2010
    Date of Patent: February 14, 2012
    Assignee: Thales
    Inventors: Myriam Nouvel, Stéphane Kemkemian
  • Patent number: 8077074
    Abstract: Certain embodiments provide a network waveform system that can include multiple radars disposed at different geographical positions within an environment. The multiple radars may be configured to transmit a network waveform. The network waveform may include multiple radar waveforms. Each radar waveform of the multiple waveforms may be transmitted by a specific radar of the multiple radars. The system can also include a computer system coupled with the multiple radars that can include a processor and a memory. The memory may be configured to store information including data received from the multiple radars, data processed by the processor, and processing code executable by the processor. The processing code may include instructions to receive output data from the multiple radars resulting from the transmitted network waveform instructions to jointly process the output data from the multiple radars to determine a measurement of the environment based on the network waveform.
    Type: Grant
    Filed: May 7, 2009
    Date of Patent: December 13, 2011
    Assignee: Colorado State University Research Foundation
    Inventors: Chandrasekaran Venkatachalam, Nitin Bharadwaj
  • Publication number: 20110267223
    Abstract: Range and Doppler ambiguities are common in radar, lidar, and acoustic systems. Resolving these ambiguities is important to achieve desirable geolocation and image quality performance in these systems. A new method is described to iteratively resolve the ambiguities. For Doppler ambiguity applications, a first PRF value and an initial Doppler frequency search window are selected. A new PRF is determined based on the ratio of the initial search window to the first PRF. The radar data of the first pair of PRF's is used to determine two modulo Doppler estimates. The modulo Doppler estimates are used to determine a new Doppler estimate with a confidence interval smaller than the first search window. The ratio of the new Doppler search window to the first PRF, is used to determine the next PRF. This process is iterated until the new Doppler search window is less than the first PRF.
    Type: Application
    Filed: April 29, 2010
    Publication date: November 3, 2011
    Applicant: Raytheon Company
    Inventors: Michael Yih-Hwa Jin, Chi-Yung Chang
  • Patent number: 8044844
    Abstract: The invention sets forth a method of determining a filling level of a product contained in a tank using a radar level gauge system. The steps include generating a transmission signal using first pulse generating circuitry outputting a first signal having a first oscillation frequency having a first pulse repetition frequency. The invention uses a second pulse generating circuitry having a resonator element having an input and an output, a reference signal in the form of a second pulse train having a second pulse repetition frequency which differs from the first pulse repetition frequency by a predetermined frequency difference. The invention forms a measurement signal including a sequence of values representing a time correlation between a pulse of the reference signal and the reflected signal, and determines the filling level based on the measurement signal.
    Type: Grant
    Filed: December 14, 2009
    Date of Patent: October 25, 2011
    Assignee: Rosemount Tank Radar AB
    Inventor: Håkan Nyberg
  • Patent number: 8031106
    Abstract: A method for determining at least one of the distance to and the speed of an object is discussed. The method comprises determining an indication of whether the object is approaching or moving away and generating an interrogation signal comprising a sequence consisting of segments at constant frequency and segments of varying frequency, wherein if the determining step indicates the object is approaching then the varying frequency segments have decreasing frequency and if the determining step indicates that the object is moving away then the varying frequency segments have increasing frequency. The interrogation signal is transmitted and a version of the interrogation signal reflected from the object is detected. At least one of the distance to and speed of the object is then determined using a combination of the interrogation signal and the reflected version of the interrogation signal.
    Type: Grant
    Filed: November 23, 2009
    Date of Patent: October 4, 2011
    Assignee: Mitsubishi Electric Corporation
    Inventor: Wieslaw Jerzy Szajnowski
  • Patent number: 8026840
    Abstract: A biometric radar system and method for identifying a person's positional state are generally described herein. The biometric radar may phase adjust a sequence of radar return signals received through two or more receive antennas to remove at least some phase noise due to the stationary objects. The biometric radar may also segment the phase adjusted radar return signals into a plurality of multi-resolutional Doppler components. Each multi-resolutional Doppler component may be associated with one of a plurality of biometric features. The biometric radar system may also combine and weight the segmented radar returns for each biometric feature to generate weighted classifications for a feature extraction process.
    Type: Grant
    Filed: October 28, 2005
    Date of Patent: September 27, 2011
    Assignee: Raytheon Company
    Inventors: Wesley H. Dwelly, Vinh N. Adams
  • Patent number: 8014483
    Abstract: A receiver in an impulse wireless communication. The receiver (300) includes a pulse-pair correlator (304) that receives a signal (316) and divides it into two signals for paths. One of the signals is input to signal multiplier (312) while another signal is delayed by a delay unit (310). The signal multiplier (312) multiplies the received signal (316) by a delayed signal (318). An integrator (314) integrates an output signal (322) over a designated period of time. An adding module (306) sums an output signal (324) from the integrator (314). An acquiring module (308) compares an summing-up output (326) from the adding module (306) with a predetermined threshold value to detect the existence of a transmitting-standard preamble.
    Type: Grant
    Filed: November 4, 2005
    Date of Patent: September 6, 2011
    Assignee: Panasonic Corporation
    Inventors: Yew Soo Eng, Zhan Yu
  • Patent number: 8009080
    Abstract: A weather radar includes an antenna unit of an active phased array system in which a plurality of antenna elements configured to transmit a radar pulse and receive a reflected pulse are arranged in a vertical direction, a transmission beam formation unit configured to divide an observation range in the elevation angle direction into a plurality of observation elevation angles, subdivide each observation elevation angle into a plurality of regions, assign a set of a plurality of regions not adjacent to each other to a pulse repetition interval (PRI), and form a fan-shaped transmission beam in the elevation angle direction for each of the regions in the set, and a reception beam formation unit configured to form a plurality pencil-shaped reception beams for each of the plurality of regions.
    Type: Grant
    Filed: February 4, 2010
    Date of Patent: August 30, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Fumihiko Mizutani, Masakazu Wada
  • Patent number: 7965226
    Abstract: A system and method for concurrently operating a plurality of agile beam radar modes by pulse-to-pulse interleaving groups of the radar modes. Radar modes are grouped, each radar mode being allocated a certain amount of time for operation and a suitable pulse repetition frequency to improve or optimize the duty cycle of the antenna while concurrently operating the plurality of modes. Priorities may be assigned to groups or to individual radar modes within each group. In some embodiments, TDM communications are further interleaved within the radar modes to enhance the operation of the radar antenna.
    Type: Grant
    Filed: March 31, 2009
    Date of Patent: June 21, 2011
    Assignee: Raytheon Company
    Inventors: Kapriel V. Krikorian, Robert A. Rosen, Mary Krikorian
  • Patent number: 7956798
    Abstract: A radar apparatus having an integral ARPA function transmits at least two kinds of pulse signals, each of which has different pulselength, according to a specific transmission pattern and receives echoes of the transmitted pulse signal. The radar apparatus includes an echo data generator for generating display echo data for each range scale selected for on-screen presentation by using an echo signal obtained with each transmission pulselength, an ARPA processor for generating a single set of motion-related information on each tracked target to be superimposed on the display echo data by using echo signals obtained with the different pulselengths, a display output synthesizer for superimposing the motion-related information on each tracked target generated by the ARPA processor on the display echo data, and a display unit for displaying a superimposed picture produced by the display output synthesizer.
    Type: Grant
    Filed: June 12, 2007
    Date of Patent: June 7, 2011
    Assignee: Furuno Electric Company, Ltd
    Inventors: Katsuyuki Yanagi, Koji Dai, Sae Takemoto
  • Patent number: 7952515
    Abstract: Narrow virtual transmit pulses are synthesized by differencing long-duration, staggered pulse repetition interval (PRI) transmit pulses. PRI is staggered at an intermediate frequency IF. Echoes from virtual pulses form IF-modulated interference patterns with a reference wave. Samples of interference patterns are IF-filtered to produce high spatial resolution holographic data. PRI stagger can be very small, e.g., 1-ns, to produce a 1-ns virtual pulse from very long, staggered transmit pulses. Occupied Bandwidth (OBW) can be less than 10 MHz due to long RF pulses needed for holography, while spatial resolution can be very high, corresponding to ultra-wideband (UWB) operation, due to short virtual pulses. X-Y antenna scanning can produce range-gated surface holograms from quadrature data. Multiple range gates can produce stacked-in-range holograms. Motion and vibration can be detected by changes in interference patterns within a range-gated zone.
    Type: Grant
    Filed: February 26, 2009
    Date of Patent: May 31, 2011
    Assignee: McEwan Technologies, LLC
    Inventor: Thomas Edward McEwan
  • Patent number: 7864106
    Abstract: A method and system for SNR enhancement in pulse-Doppler coherent target detection for applications in the fields of radar and ultrasound. In accordance with the method of the invention, complex signals are obtained for each of two or more sub-intervals of the time-on-target interval, allowing simultaneous range and Doppler measurements. A coherent integration is the performed on the signals to generate complex-valued folded matrices. The folded matrices are unfolded and target detection is then performed in a process involving one or more of the unfolded matrices. A pulse-Doppler coherent system is also provided configured for target detection by the method of the invention.
    Type: Grant
    Filed: April 17, 2008
    Date of Patent: January 4, 2011
    Assignee: Elta Systems Ltd.
    Inventors: Ella Beilin, Jehezkel Grizim, Yacov Vagman, Alexander Lomes
  • Patent number: 7852261
    Abstract: The present invention relates to tracking waveforms in radar which minimizes the dwell time and energy in a tracking waveform while maintaining a specified track positional accuracy and consequently velocity accuracy. The present invention provides a method and apparatus for selecting a tracking waveform in a radar apparatus comprising determining a target range rate; determining a signal strength; determining the radiated frequency of the subsequent transmitted tracking waveform; and modifying the energy and pulse repetition frequency used on subsequent tracking waveforms on the basis of the determined target range rate, signal strength and next transmitted tracking waveform frequency.
    Type: Grant
    Filed: May 29, 2008
    Date of Patent: December 14, 2010
    Assignee: BAE Systems PLC
    Inventor: William Kenneth Stafford
  • Patent number: 7800528
    Abstract: A radar level gauge (RLG) system and method for determining a filling level of a filling material in a tank is disclosed. The RLG system comprises a transmitter for generating and transmitting an electromagnetic transmitter pulse signal, a transmitter controller for controlling means for pulse width adjustment for adjusting the pulse width of the transmitter pulse signal in dependence of at least one application specific condition. Further, the system comprises a signal medium interface connectable to means for directing said transmitter pulse signal towards said filling material and for receiving a reception pulse signal reflected back from said filling material; a receiver for receiving said reception pulse signal from the tank; and processing circuitry for determining the filling level of the tank based on said reflection pulse signal received by said receiver. The application specific condition(s) is e.g.
    Type: Grant
    Filed: July 31, 2007
    Date of Patent: September 21, 2010
    Assignee: Rosemount Tank Radar AB
    Inventors: Valter Nilsson, Anders Jirskog, Niklas Penndal
  • Patent number: 7773028
    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: Grant
    Filed: August 2, 2007
    Date of Patent: August 10, 2010
    Assignee: Raytheon Company
    Inventors: Tony Meng Yuen Chan, Mark Gerecke
  • Patent number: 7760130
    Abstract: A method for presence detection using a microwave transmitter and a microwave receiver, the method including generating a sequence of clock pulses by means of a pulse generator, feeding the clock pulses to a clocked circuit arranged to generate a sequence of first pulses of a first pulse length and a sequence of second pulses of a second pulse length, each one of the first and second pulse lengths being related to a predetermined number of the clock pulses, periodically actuating the microwave transmitter by means of the sequence of first pulses, periodically actuating the microwave receiver by means of the sequence of second pulses; and determining whether an object is present in the detection volume based on microwave radiation being received by the microwave receiver. A system for such presence detection is also disclosed.
    Type: Grant
    Filed: October 20, 2008
    Date of Patent: July 20, 2010
    Assignee: Ford Global Technologies, LLC
    Inventor: Anders Antonsson