Digital Processing Patents (Class 342/195)
  • Patent number: 8773299
    Abstract: An exemplary embodiment relates to an aircraft system for detecting wires. The system includes a processor configured to actively sense a presence of a first object and a second object. The processor determines a location of the first object and the second object. The processor determines a potential location of a wire between the first object and the second object. The processor actively senses the wire by providing electromagnetic energy to the potential location.
    Type: Grant
    Filed: September 29, 2009
    Date of Patent: July 8, 2014
    Assignee: Rockwell Collins, Inc.
    Inventors: Daniel L. Woodell, Richard D. Jinkins, Richard M. Rademaker
  • Publication number: 20140168004
    Abstract: A radar system comprises a transmitting device comprising a reference frequency source, for generating a reference frequency signal; a direct-digital synthesizer, coupled to the reference frequency source, for generating a synthesized frequency signal according to the reference frequency signal; a phase lock loop, coupled to the direct-digital synthesizer, for converting the synthesized frequency signal to an output signal; a transmitting antenna, coupled to the phase lock loop, for emitting the output signal to the air; and a loop switch module, coupled to the phase lock loop, for switching the phase lock loop between an open loop mode and a closed loop mode; and at least one receiving device, for receiving at least one wireless signal, and processing the at least one wireless signal according to the output signal generated by the phase lock loop.
    Type: Application
    Filed: March 26, 2013
    Publication date: June 19, 2014
    Applicant: WISTRON NEWEB CORPORATION
    Inventors: I-Shan Chen, Trsung-Fu Hsu, Cheng-Hsiung Hsu, Hsin-Lung Hsiao
  • Patent number: 8754806
    Abstract: A pulse radar receiver includes a power splitter configured to split a transmit (TX) trigger signal for generating a TX pulse, a phase-locked loop (PLL) configured to receive a division ratio and the TX trigger signal split by the power splitter, and generate a sampling frequency, and a sampler configured to sample a reflected wave received through an RX antenna, according to the sampling frequency generated by the PLL. Accordingly, it is possible to provide a high distance resolution by generating a sampling frequency with a difference from a TX pulse to sample a reflected wave received through an RX antenna. Thus, it is possible to overcome a limitation in the distance resolution due to the pulse width and to measure a minute movement at a short distance. Therefore, the pulse radar receiver is applicable to high range resolution radar applications such as a living body measuring radar.
    Type: Grant
    Filed: December 9, 2011
    Date of Patent: June 17, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Pil Jae Park, Seong Do Kim, Sung Chul Woo, Hyun Kyu Yu
  • Publication number: 20140152491
    Abstract: An electronic device and a method for sensing an active state of an object are provided; the electronic device includes a signal generating module, a non-symmetric antenna module and a signal analyzing module. The signal generating module is configured to generate a pulse width modulation signal, generate a measuring signal with overshoot and undershoot pulses according to the pulse width modulation signal, and generate a reference signal according to the measuring signal. The non-symmetric antenna module includes a transmitting antenna and a receiving antenna. The transmitting antenna is configured to transmit the measuring signal to an object. The receiving antenna is configured to receive the measuring signal reflected by the object. The signal analyzing module is configured to receive and process the reference signal and the measuring signal reflected by the object, so as to obtain an object active state signal.
    Type: Application
    Filed: January 16, 2013
    Publication date: June 5, 2014
    Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Yen-Hsien Lee, Wen-Jen Tseng, Hong-Dun Lin
  • Patent number: 8742979
    Abstract: This disclosure provides a range side lobe removal device, which includes a pulse compressor for acquiring a reception signal from a radar antenna and generating a pulse-compressed signal by performing a pulse compression of the reception signal, a pseudorange side lobe generator for generating a pseudo signal of range side lobes of the pulse-compressed signal based on the reception signal, and a signal remover for removing a component corresponding to the pseudo signal from the pulse-compressed signal.
    Type: Grant
    Filed: April 11, 2012
    Date of Patent: June 3, 2014
    Assignee: Furuno Electric Company Limited
    Inventor: Yoshifumi Ohnishi
  • Patent number: 8736484
    Abstract: A system and method for increasing the effective angular resolution of a multi-function phased array radar system is provided. The system is operative to simultaneously transmit a plurality of overlapping sub-beams covering a representative central beam. A de-convolution process is applied to received return signals. The process includes determining the reflectivity within sub-beamwidth resolution cells defined by the overlapping sub-beams. Generated sub-beamwidth data provides the radar system with an effective angular resolution beyond that of any single transmitted beam.
    Type: Grant
    Filed: August 11, 2010
    Date of Patent: May 27, 2014
    Assignee: Lockheed Martin Corporation
    Inventors: Kai-Bor Yu, Manuel F. Fernandez, Svetlana M. Bachmann
  • Patent number: 8730098
    Abstract: Methods are described for radar detection of persons wearing wires using radar spectra data including the vertical polarization (VV) radar cross section and the horizontal polarization (HH) radar cross section for a person. In one embodiment, the ratio of the vertical polarization (VV) radar cross section to the horizontal polarization (HH) radar cross section for a person is compared to a detection threshold to determine whether the person is wearing wires. In another embodiment, the absolute difference of the vertical polarization (VV) radar cross section and the horizontal polarization (HH) radar cross section for a person is compared to a detection threshold to determine whether the person is wearing wires. To reduce false positives, other additional indicators, such as speed of movement, and or visual features of the person, can be used to further narrow a person suspected of wearing wires.
    Type: Grant
    Filed: January 5, 2012
    Date of Patent: May 20, 2014
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: William P. Fox
  • Patent number: 8723721
    Abstract: A multistatic radar surveillance system includes transmitter elements and receiver elements arranged according to a zone to be monitored, and a command and control unit that configures the elements and collects information relating to objects detected by the receiver elements. Each transmitter element transmits a signal, the bandwidth of which is substantially equal to the totality of a frequency band B allocated to the system. Each transmitter element transmits a common waveform to all of the transmitter elements, and the waveform is modulated by a binary signal specific to the element in question, this signal allowing each of the receiver elements receiving a signal to identify the transmitter element at the source of this signal. The coding applied to the waveform is defined so that the spread spectrum caused to the signal transmitted by the latter does not exceed the frequency band B allocated to the system.
    Type: Grant
    Filed: December 28, 2010
    Date of Patent: May 13, 2014
    Assignee: Thales
    Inventors: Michel Moruzzis, Daniel Muller, Jean-Marie Ferrier
  • Patent number: 8723723
    Abstract: A dual mode ground penetrating radar includes an enclosure which houses radar electronics. The dual mode ground penetrating radar includes a enclosure housing radar electronics. The dual mode ground penetrating radar further includes a first antenna feed having ferrite loading and extending outside of the enclosure. The dual mode ground penetrating radar further includes a second antenna feed spaced apart from the first antenna feed, the second antenna feed having ferrite loading and extending outside of the enclosure. An RF signal is provided in at least one of the first and second antenna feeds by the radar electronics.
    Type: Grant
    Filed: February 8, 2013
    Date of Patent: May 13, 2014
    Assignee: King Abdulaziz City for Science and Technology
    Inventors: Tariq A. Al-Khalefah, Khaled F. R. Almutairi, Per Arne Vincent Utsi
  • Patent number: 8717230
    Abstract: A method and system for suppressing unwanted signals when detecting objects of interest in a detection system comprising an antenna system and two or more receive beams. A background map is created by range, azimuth and Doppler. Locations within the residual clutter in the moving Doppler bins are selected for nulling. Adaptive nulling is performed independently on each Doppler bin of the selected location to enable Doppler-specific spatial nulling for the same range and azimuth bin.
    Type: Grant
    Filed: February 15, 2012
    Date of Patent: May 6, 2014
    Assignee: Lockheed Martin Corporation
    Inventors: Jonathan Fischi, Peter H. Stockmann
  • Patent number: 8704704
    Abstract: Presented is a method for determining speeds (vr14, vr16) and distances (r14, r16) of objects (14, 16) relative to a radar system (12) of a motor vehicle (10), wherein a coverage area (EB) of the radar system (12) is divided into at least two part-areas (TB1, TB2, TB3), the coverage area (EB) is examined for reflecting objects (14, 16) in successive measuring cycles (MZ1, MZ2; MZi, MZi+1), wherein radar signals received in a measuring cycle (MZ1, MZ2; MZi, MZi+1) are processed separated in accordance with part-areas (TB1, TB2, TB3) and processed signals are assembled to form a total result differentiated in accordance with spatial directions. The method is characterized in that from signals received in a first measuring cycle (MZ1; MZi), hypotheses for the distance (r14, r16) and speed (vr14, vr16) of reflecting objects (14, 16) are formed and the hypotheses are validated in dependence on signals received in at least one further measuring cycle (MZ2; MZi+2).
    Type: Grant
    Filed: June 16, 2007
    Date of Patent: April 22, 2014
    Assignee: VALEO Schalter und Sensoren GmbH
    Inventors: Urs Luebbert, Udo Haberland
  • Patent number: 8704702
    Abstract: The invention relates to a method for estimating an object motion characteristic from a radar signal. The method comprises the step of receiving radar data of an object from a multiple beam radar system. Further, the method comprises the steps of associating radar data with estimated height and/or cross-range information of object parts causing the corresponding radar data and fitting an object model with radar data being associated with a selected estimated height and/or cross-range information interval. The method also comprises the step of determining an object motion characteristic from the fitted object model.
    Type: Grant
    Filed: January 15, 2010
    Date of Patent: April 22, 2014
    Assignee: Nederlandse Organisatie voor toegepast-natuurwetenschappelijk Onderzoek TNO
    Inventor: Philip van Dorp
  • Patent number: 8698669
    Abstract: Another embodiment of the disclosure relates to an altitude system for an aircraft. The aircraft radar system includes a processor configured to determine an altitude of the aircraft using runway position information, and an angle to the runway associated with a radar beam to the runway. The angle to the runway is being determined using a pointing angle of the antenna adjusted with an angular offset. The angular offset is determined from phase processing.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: April 15, 2014
    Assignee: Rockwell Collins, Inc.
    Inventors: Daniel L. Woodell, Richard D. Jinkins, Richard M. Rademaker, Patrick D. McCusker
  • Publication number: 20140091964
    Abstract: A radar includes an antennal structure, with means for transmitting an impulse signal in a band centered on F1 according to a repetition period centered on a recurrence period Tr1 and pulse width T1, with means for receiving signals by the antenna in frequency band ?F, with a unit for processing the signals received on a set of N distance bins. The signals received are transmitted by another radar in a frequency band centered on F2 where F2?F1??F, according to a repetition period centered on a period Tr2 and pulse width T2. The signals transmitted by the two radars are asynchronous. The method comprises: slaving frequency F1 to frequency F2, by measuring the power received integrated over the N distance bins and over several recurrences, determination of period Tr2 and T2 and slaving the period centered on Tr1 to a period centered on Tr2 with Tr1=k*Tr2.
    Type: Application
    Filed: February 13, 2012
    Publication date: April 3, 2014
    Applicant: THALES
    Inventors: Pascal Cornic, Daniel Jahan, Patrick Garrec
  • Patent number: 8686892
    Abstract: A method of reducing cross-range streaking in a radar image includes determining a number of on-pixels in each line of at least a portion of the radar image, determining which lines have a determined number of on-pixels that exceeds a threshold number, and removing the on-pixels of lines having the determined number of on-pixels exceeding the threshold number.
    Type: Grant
    Filed: August 5, 2011
    Date of Patent: April 1, 2014
    Assignee: Raytheon Company
    Inventor: Brent McCleary
  • Patent number: 8686898
    Abstract: A DDS based system, such as a radar, includes means for generating a plurality of transmission signals using a DDS, and means for integrating signals derived therefrom, such as received signals. The system further includes means for varying the relative starting phase of the plurality of transmission signals, or adjusting the DDS input clock while maintaining similar primary output frequency characteristics of the transmission signals. The approach has the effect of changing the location of unwanted frequency spurs in each of the transmission signals, and hence the effects of these are decreased in the integration process. An improvement in the sensitivity of the system results. Although primarily suited to radar applications the invention may find utility in other systems such as sonar or lidar systems.
    Type: Grant
    Filed: November 19, 2009
    Date of Patent: April 1, 2014
    Assignee: Qinetiq Limited
    Inventors: Patrick David Lawrence Beasley, Robert David Hodges, David George Hodges
  • Patent number: 8686326
    Abstract: In certain aspects, this invention is a “control system” that detects and minimizes (or otherwise optimizes) an angle between vehicle centerline (or other reference axis) and vehicle velocity vector—as for JDAM penetration. Preferably detection is exclusively by optical flow (which herein encompasses sonic and other imaging), without data influence by navigation. In other aspects, the invention is a “guidance system”, with optical-flow subsystem to detect an angle between the vehicle velocity vector and line of sight to a destination—either a desired or an undesired destination. Here, vehicle trajectory is adjusted in response to detected angle, for optimum angle, e.g. to either home in on a desired destination or avoid an undesired destination (or rendezvous), and follow a path that's ideal for the particular mission—preferably by controlling an autopilot or applying information from navigation.
    Type: Grant
    Filed: March 25, 2009
    Date of Patent: April 1, 2014
    Assignee: Arete Associates
    Inventors: John C. Dennison, David C. Campion
  • Publication number: 20140085128
    Abstract: A first radar transmitter and a second radar transmitter transmit a first modulation signal and a second modulation signal which are generated by repeating a predetermined time of code sequences, each of which has a predetermined code length, using a first code width and a second code width, respectively. An A/D converter converts the modulation signal into a discrete signal in a sampling cycle shorter than a difference between the first code width and the second code width. A positioning section separates a plurality of reception signals using a first correlation value based on outputs from the A/D converter and a first delay section corresponding to the first code width and a second correlation value based on outputs from the A/D converter and a second delay section corresponding to the second code width.
    Type: Application
    Filed: May 25, 2012
    Publication date: March 27, 2014
    Applicant: Panasonic Corporation
    Inventors: Takaaki Kishigami, Yoichi Nakagawa, Hirohito Mukai
  • Patent number: 8681035
    Abstract: A microwave imaging system uses microwave radiation provided by a microwave source to image targets. The system includes an array of antenna elements that are capable of being programmed with a respective direction coefficient to direct the microwave illumination from the microwave source toward a position on the target. The antenna elements are further capable of being programmed to receive reflected microwave illumination reflected from the position on the target. A processor is operable to measure an intensity of the reflected microwave illumination to determine a value of a pixel within an image of the target. Multiple beams can be directed towards the target to obtain corresponding pixel values for use by the processor in constructing the image.
    Type: Grant
    Filed: June 8, 2005
    Date of Patent: March 25, 2014
    Assignee: Agilent Technologies, Inc.
    Inventors: Izhak Baharav, Robert C. Taber, Gregory S. Lee, John Stephen Kofol
  • Patent number: 8682507
    Abstract: Disclosed are a method and system for improving real-time determination of flight parameters of an aircraft during flight. A selection module selects and delivers measured values of input parameters to an estimation unit, and the estimation unit uses the input parameters to estimate at least two selected flight parameters. The input parameters are received by the estimation unit on the basis of identified flight mechanics equations associated with the selected flight parameters. The estimation unit includes an extended Kalman filter, which is configured to receive the values of the input parameters and to output joint estimations of the selected flight parameters based on the flight mechanics equations, during the flight of the aircraft.
    Type: Grant
    Filed: July 31, 2012
    Date of Patent: March 25, 2014
    Assignees: Airbus Operations SAS, Onera (Office National d'etudes et de Recherches Aerospatiales)
    Inventors: Pierre Ezerzere, Cedric Seren, Georges Hardier
  • Patent number: 8674875
    Abstract: The invention provides a security scanner that produces a radar profile of a clothed person or another object such as a bag carried by a person at a distance and does not require close proximity of the person or object to the scanner itself. The scanner includes a millimeter wave antenna system optimised for short-range active imaging and arranged to provide rapid high-resolution images of an object or person of interest and processing means for resolving the images so as to detect the presence of predetermined objects. The processing means preferably includes means for comparing contrasts in reflectivity in the scanned images with predetermined expected values from skin and light clothing. The processing means may also include means for detecting predetermined behavioral or physical traits such as the effect on gait on carried weighty objects or stiff structures strapped to the person from the images of a scanned object or person. The scanner may be incorporated within a turnstile access arrangement.
    Type: Grant
    Filed: September 7, 2007
    Date of Patent: March 18, 2014
    Assignee: MBDA UK Limited
    Inventors: Christopher Ralph Carter, Charles Anthony Rowatt
  • Patent number: 8665140
    Abstract: This disclosure provides a signal processing device, which includes an echo signal input unit for being inputted with echo signals caused by electromagnetic waves discharged from an antenna and reflected on one or more target objects, an echo signal level detector for detecting a level of each of the echo signals with reference to an azimuth and a distance to the antenna, a level change detector for detecting a level change between the echo signals from locations close to each other, the locations of the echo signals being such that the distances from the antenna are substantially the same but the azimuths are different, a pattern output module for comparing the level change with a predetermined reference pattern and outputting a level change pattern, and a missing determining module for determining a missing of a signal based on at least two of the level change patterns.
    Type: Grant
    Filed: November 10, 2011
    Date of Patent: March 4, 2014
    Assignee: Furuno Electric Company Limited
    Inventors: Kazuya Nakagawa, Hitoshi Maeno
  • Patent number: 8665133
    Abstract: Systems and methods for improving situational awareness on an in-trails procedures display. A radar system transmits a radar signal and receives and stores weather radar reflectivity values into a three-dimensional buffer. A processor determines whether any of the stored weather reflectivity values indicate the presence of a weather hazard and generates one or more weather hazard icons based on the stored weather reflectivity values. An in-trail procedures display device displays the generated weather hazard icons. Wake vortex information for other aircraft is generated and outputted on the in-trail procedures display. Also, the processor receives a request for an altitude change and generates an alert when the aircraft is determined not to be cleared to transition to the requested altitude based on a projected transition, any existing weather hazards, wake vortices of proximate aircraft, and in-trail procedures.
    Type: Grant
    Filed: February 4, 2010
    Date of Patent: March 4, 2014
    Assignee: Honeywell International Inc.
    Inventors: Ratan Khatwa, Dave Pepitone
  • Publication number: 20140049423
    Abstract: Frequency swept radar signals are transmitted from a plurality of transmitter antennas with predetermined timing offsets between the frequency sweeps of respective ones of the transmitters. A combination of reflections of the transmitted frequency swept radar signals is received. A filter bank separates a plurality of beat signals from respective frequency bands in the received combination of reflections. Transmitter antennas at respective different spatial locations may be used and intermediate signals derived from the separated beat signals may be summed to form a synthetic aperture radar image.
    Type: Application
    Filed: February 24, 2012
    Publication date: February 20, 2014
    Applicant: NEDERLANDSE ORGANISATIE VOOR TOEGEPAST-NATUURFWET ENSCHAPPELIJK ONDERZOEK TNO
    Inventors: Adriaan Jan De Jong, Wilhelmus Lambertus van Rossum
  • Patent number: 8654007
    Abstract: The present invention relates to the general field of radar tracking applied to multi-static radar systems. It consists of a method for coherently merging the individual tracks generated from the various bistatic bases that make up the system so as to generate and maintain global tracks so that an object detected by a single bistatic base is represented by the corresponding track and an object detected by a number of bistatic bases and giving rise to the creation of a number of individual tracks is represented only by a single global track.
    Type: Grant
    Filed: August 28, 2012
    Date of Patent: February 18, 2014
    Assignee: Thales
    Inventors: Sébastien Allam, Emmanuel De Gramont, Wilfried Greverie, Jean-Claude Deltour, Mathieu Klein
  • Patent number: 8648743
    Abstract: A method and an arrangement are provided for producing a computed distribution of speeds of scatterers in a target volume (1701). An estimate distribution of speeds at which scatterers would move in the target volume is provided (1201). It is converted (1202) to a candidate autocorrelation function that represent autocorrelation data points that a pulse radar would measure from the current estimate distribution. The fit of a candidate ACF to a measured ACF is measured (1203). The estimate distribution is accepted if a measured fit fulfills a predefined acceptance criterion, or modified (1205) in which case processing returns to the conversion of the modified estimate distribution to an ACF. An accepted estimate distribution is output (1206) as a computed distribution of speeds that describes the actual distribution of speeds.
    Type: Grant
    Filed: November 29, 2012
    Date of Patent: February 11, 2014
    Assignee: Eigenor Oy
    Inventor: Jorn Sierwald
  • Patent number: 8643537
    Abstract: A method for considering an echo amplitude profile as a result of convoluting a single echo with a channel response sequence, wherein for multiple echo detection, an estimation task is broken into three major steps comprising estimating a channel response, recovering a full shape of a single echo, and iteratively updating the channel response and echo shape to increase their accuracy. The estimation of the channel response is treated as a single echo detection problem and includes estimating the strongest echo for its position and amplitude, removing an echo corresponding to this recovered channel from the echo amplitude profile, and repeating the preceding steps for the next strongest echo.
    Type: Grant
    Filed: October 18, 2011
    Date of Patent: February 4, 2014
    Assignee: Siemens Aktiengesellschaft
    Inventor: Jing Liu
  • Publication number: 20140015709
    Abstract: There is provided a waveguide connecting structure, including first, second, third and fourth waveguides. A first coupling window at one of magnetic field planes of the third waveguide couples the first and third waveguides in such a manner that the electric field planes of both are in parallel. A second coupling window formed at one of the electric field planes of the third waveguide couples the second and third waveguides in such a manner that the electric field planes of the second waveguide is in parallel with the magnetic field planes of the first waveguide. A third coupling window formed at the other one of the electric field planes couples the fourth and third waveguides in such a manner that the electric field planes of the fourth waveguide is in parallel with the magnetic field planes of the first waveguide.
    Type: Application
    Filed: July 11, 2013
    Publication date: January 16, 2014
    Inventors: Tetsu SHIJO, Koh HASHIMOTO, Shuichi OBAYASHI
  • Publication number: 20140009325
    Abstract: The present invention provides a method for separating, or de-interleaving, a stream of radar pulses, interleaved in time, received by a receiving antenna (10) and receiver (12) from several radar sources. De-interleaving the stream of received pulses may include forming clusters of pulses having similar parameter values around anchor points, where each cluster is defined by a window around its anchor point. The dimensions of each window may be determined by a weighted distance, i.e., a measure of dissimilarity, calculated using weights. Each weight may depend inversely on the measurement error in the parameter with which the weight is associated. Each anchor point may have a set of weights adjusted to its parameter values, and which may change as operating conditions change. The weights may be determined using a method including a calibration step, which may include injecting pulses with known parameters into the receiver (12).
    Type: Application
    Filed: June 1, 2012
    Publication date: January 9, 2014
    Inventor: George D. Hammack
  • Patent number: 8624776
    Abstract: A radar or sonar system amplifies the signal received by an antenna of the radar system or a transducer of the sonar system is amplified and then subject to linear demodulation by a linear receiver. There may be an anti-aliasing filter and an analog-to-digital converter between the amplifier and the linear receiver. The system may also have a digital signal processor with a network stack running in the processor. That processor may also have a network interface media access controller, where the system operates at different ranges, the modulator may produce pulses of two pulse patterns differing in pulse duration and inter-pulse spacing, those pulse patterns are introduced and used to form two radar images with the two images being derived from data acquired in a duration not more than twenty times larger than the larger inter-pulse spacing, or for a radar system, larger than one half of the antenna resolution time. One or more look-up tables may be used to control the amplifier.
    Type: Grant
    Filed: August 29, 2008
    Date of Patent: January 7, 2014
    Assignee: Raymarine UK Limited
    Inventors: Richard Jales, Andrew Lawrence, Matthieu Maindrou
  • Patent number: 8610041
    Abstract: A system for engaging hostile air or space threats with a defensive missile, where the defensive missile comprises an antenna for receiving global positioning system (GPS) signals. A global positioning system receiver is coupled to said antenna, for receiving global positioning system signals directly from global positioning system satellites and global positioning system signals reflected from the threat. A processing arrangement processes the direct and reflected global positioning system signals for determining the position and velocity of the threat. Vectoring controls are coupled to the processing arrangement, and are responsive to the location of the threat for directing the defensive missile toward the threat. In a particular embodiment, the antenna of the defensive missile is directionally controllable, and the defensive missile includes an antenna direction controller responsive to the processor for directing at least a beam of the antenna toward the threat.
    Type: Grant
    Filed: May 23, 2011
    Date of Patent: December 17, 2013
    Assignee: Lockheed Martin Corporation
    Inventor: Jonathan A. Boardman
  • Patent number: 8610621
    Abstract: A method for transmission and detection in an adaptive-on-transmit (AT) system operating in the electromagnetic spectrum comprising determining a waveform-filter pair; and employing the waveform-filter pair in transmission and detection, wherein two or more are provided of the group consisting of an auto-correlation function sidelobe level reduction proportional to a the filter length, K, or better, an out-of-band spectral suppression of at least about 40 dB, and a frequency spectrum power tail power decay of K?4 or better.
    Type: Grant
    Filed: August 2, 2011
    Date of Patent: December 17, 2013
    Assignee: Arrowhead Center, Inc.
    Inventors: Ana Vazquez Alejos, Muhammad Dawood
  • Patent number: 8604971
    Abstract: A method and apparatus is devised for detecting objects of interest in which frequency-scanned RF in the HF region of the electromagnetic spectrum is projected out across a given area and returns are detected and converted into image data in which phase, amplitude, range and frequency associated with the incoming data is correlated with frequency-dependent range templates to determine the existence of, the range of and the direction of the objects of interest.
    Type: Grant
    Filed: December 1, 2009
    Date of Patent: December 10, 2013
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: John T. Apostolos, Richard J. Millard
  • Publication number: 20130321199
    Abstract: A passive radar device includes: a pulse-by-pulse range compression unit executing cross-correlation processing between received signals of a direct wave and scattered wave on each of pulses divided by a direct-wave reception unit and a scattered-wave reception unit, and calculating a pulse-by-pulse range profile; a block-by-block Doppler processing unit calculating a first Doppler frequency spectrum by executing pulse-direction Fourier transform in block units each grouping plural pulses; a Doppler frequency cell-associated range migration compensation unit compensating a range-direction movement amount with respect to the first Doppler frequency spectrum on a Doppler-frequency-cell-by-Doppler-frequency-cell basis and on a block-by-block basis; and a block-direction Doppler processing unit calculating a second Doppler frequency spectrum by executing block-direction Fourier transform on an output from the Doppler frequency cell-associated range migration compensation unit.
    Type: Application
    Filed: February 18, 2011
    Publication date: December 5, 2013
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kei Suwa, Tadashi Oshima, Shohei Nakamura, Toshio Wakayama
  • Patent number: 8598501
    Abstract: A sensor system uses ground emitters to illuminate a projectile in flight with a polarized RF beam. By monitoring the polarization modulation of RF signals received from antenna elements mounted on the projectile, both angular orientation and angular rate signals can be derived and used in the inertial solution in place of the gyroscope. Depending on the spacing and positional accuracies of the RF ground emitters, position information of the projectile may also be derived, which eliminates the need for accelerometers. When RF signals of ground emitter/s are blocked from the guided projectile, the sensor deploys another plurality of RF antennas mounted on the projectile nose to determine position and velocity vectors and orientation of incoming targets.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: December 3, 2013
    Assignee: Northrop Grumman Guidance an Electronics Co., Inc.
    Inventors: A. Douglas Meyer, Mostafa A. Karam, Charles A. Lee, Charles H. Volk
  • Patent number: 8593338
    Abstract: A new approach to radar imaging is described herein, in which radar pulses are transmitted with an uneven sampling scheme and subsequently processed with novel algorithms to produce images of equivalent resolution and quality as standard images produced using standard synthetic aperture radar (SAR) waveforms and processing techniques. The radar data collected with these waveforms can be used to create many other useful products such as moving target indication (MTI) and high resolution terrain information (HRTI). The waveform and the correction algorithms described herein allow the algorithms of these other radar products to take advantage of the quality Doppler resolution.
    Type: Grant
    Filed: January 17, 2013
    Date of Patent: November 26, 2013
    Assignee: Areté Associates
    Inventors: Jeremy Francis Burri, Michael Howard Farris, Matthew Michael Pohlman, Randall Edward Potter
  • Patent number: 8593335
    Abstract: A method includes inputting an echo signal from an antenna for discharging an electromagnetic wave to a predetermined area and receiving an echo signal reflected on a target object, outputting a level of the echo signal from every location so as to associate the level with a distance from the antenna in an azimuth direction where the electromagnetic wave is discharged, calculating a degree of change in the level of the echo signal from mutually adjacent locations among all the locations concerned, performing edge emphasis processing for the level of the echo signal in the azimuth direction based on the degree of change and outputting an edge-emphasized echo signal, and performing scan-to-scan correlation processing to calculate a correlation value of the echo signals of two or more scans using the edge-emphasized echo signals, where the echo signals from the entire predetermined area is used as one scan.
    Type: Grant
    Filed: January 25, 2011
    Date of Patent: November 26, 2013
    Assignee: FURUNO Electric Company Limited
    Inventor: Kazuya Nakagawa
  • Patent number: 8587473
    Abstract: A method for onboard determination of a roll angle of a projectile. The method including: transmitting a polarized RF signal from a reference source, with a predetermined polarization plane; receiving the signal at a pair of polarized RF sensor cavities positioned symmetrical on the projectile with respect to a reference roll position on the projectile; measuring a difference between an output of the pair of polarized RF sensor cavities resulting from the received signal to determine zero output roll positions of the projectile; and comparing an output of the pair of polarized RF sensor cavities at each of the zero output positions to determine when the projectile is parallel to the predetermined polarization plane. The method can also include analyzing an output of at least one third sensor positioned on the projectile to determine whether the roll angle position of the projectile is up as compared to the horizon.
    Type: Grant
    Filed: May 17, 2012
    Date of Patent: November 19, 2013
    Assignee: Omnitek Partners LLC
    Inventors: Jahangir S. Rastegar, Carlos M. Pereira
  • Patent number: 8586901
    Abstract: Embodiments of a guidance section that compensates for boresight error (BSE) caused by effects of a composite radome. The guidance section includes a BSE compensation element to add high-pass filtered noise to compensated BSE data. The guidance section also includes and a Kalman filter to generate line-of-sight rate (LOSR) BSE noise from the compensated BSE data and the added high-pass filtered noise. In some embodiments, a method for generating a revised BSE correction matrix is provided. The revised BSE correction matrix may compensate for BSE caused by effects in the composite radome and may correct for relative target velocity error.
    Type: Grant
    Filed: August 26, 2010
    Date of Patent: November 19, 2013
    Assignee: Raytheon Company
    Inventor: Robert L. Kesselring
  • Patent number: 8587468
    Abstract: A method, a system and a program product for deinterleaving and classifying an incoming unknown radar pulse pattern uses a library of state machines that mesh with a library of known radar pulse patterns of a library of known radar emitter sources. A continuous sequence of radar pulse descriptor words is secured for the incoming unknown radar pulse pattern and a plurality of state machines that may mesh with the continuous sequence of radar pulse descriptor words is selected from the library of state machines. The plurality of state machines that may mesh with the incoming unknown radar pulse pattern is operated upon the incoming unknown radar pulse pattern. Radar emitter sources that correlate with state machines that actually mesh with the incoming unknown radar pulse pattern are designated as radar emitter sources that comprise the incoming unknown radar pulse pattern.
    Type: Grant
    Filed: May 3, 2011
    Date of Patent: November 19, 2013
    Assignee: SRC, Inc.
    Inventors: Michael Patrick Card, Paul Guy Springer
  • Patent number: 8576110
    Abstract: A method of detecting a target in a room using a radar system having a transmitter for irradiating the object, a sensor for receiving reflected radiation, and circuitry for analyzing the reflected radiation to determine at least one characteristic thereof, the method including determining at least one parameter for each wall of a plurality of walls of a room containing the target; determining possible signal paths between the target and the sensor for paths including up to N reflections based on the at least one parameter of each wall and the location of the sensor; calculating target image locations based on the possible signal paths; and processing the received radiation to determine a target location based on target image locations.
    Type: Grant
    Filed: July 7, 2011
    Date of Patent: November 5, 2013
    Assignee: Raytheon Company
    Inventor: Mark L. Valentine
  • Patent number: 8569669
    Abstract: A SAR image recorded by a reconnaissance system is transferred as a reference edge image together with the data of the trajectory as a reference. The signal of the infrared seeker head of the missile is converted into a virtual SAR edge image and compared to the SAR reference image to calculate the precise position of the missile.
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: October 29, 2013
    Assignee: LFK-Lenkflugkoerpersysteme GmbH
    Inventors: Michael Holicki, Nikolaus Schweyer, Juergen Zoz
  • Patent number: 8564473
    Abstract: A method for constructing focused radar images includes chopping the radar illumination period into p sub-periods, two successive sub-periods overlapping temporally; choosing n successive sub-periods from among the p sub-periods, and for each of the n chosen sub-periods, performing radar acquisitions to generate an image IM_0x of resolution R0; and applying an autofocus processing to each of the n images IM_0x generated; combining the n images so as to generate at least one new focused radar image IM_1x. The method is applied notably to the production of high-resolution SAR images with the help of an aircraft equipped with a radar antenna.
    Type: Grant
    Filed: May 17, 2011
    Date of Patent: October 22, 2013
    Assignee: Thales
    Inventors: Luc Bosser, Joan Broussolle, Julien Lafaix
  • Patent number: 8558731
    Abstract: A method of determining an angle within the beam to a target using an airborne radar includes receiving first data associated with first returns associated with a first portion of an antenna. The method further includes receiving second data associated with second returns associated with a second portion of an antenna, wherein the first portion is not identical to the second portion. The method further includes determining the angle within the beam to the target using the first and second data.
    Type: Grant
    Filed: July 2, 2008
    Date of Patent: October 15, 2013
    Assignee: Rockwell Collins, Inc.
    Inventor: Daniel L. Woodell
  • Patent number: 8558730
    Abstract: A method for detecting precipitation in a region monitored by radar beams includes ascertaining a first average power of a first backscattered radar signal, ascertaining a second average power of a second backscattered radar signal, and detecting an existence of a homogenous medium when the average powers conform.
    Type: Grant
    Filed: September 17, 2007
    Date of Patent: October 15, 2013
    Assignee: Robert Bosch GmbH
    Inventor: Alebel Arage Hassen
  • Patent number: 8547273
    Abstract: The invention provides a pulse radar apparatus, and a control method thereof, that permits to readily downsize and to lower its cost and allows information on an object to be detected in high precision by removing an influence of noise when a gain of a variable gain amplifier is discontinuously changed corresponding to detected distance, with a simple configuration. A variable gain amplifier 135 configured to adjust a gain corresponding to a distance gate is used to be able to detect weak reflected wave from a distant object and to amplify a reflected wave from a short distance with a low gain. An offset noise from the variable gain amplifier 135 is prepared together with interference noise and self-mixing noise in advance as a replica signal of unwanted wave and the replica signal is removed from a baseband signal in detecting the object T.
    Type: Grant
    Filed: September 6, 2012
    Date of Patent: October 1, 2013
    Assignees: Furukawa Electric Co., Ltd., Furukawa Automotive Systems Inc.
    Inventors: Yasushi Aoyagi, Kazutaka Kamimura, Yoshihito Ishida
  • Publication number: 20130241767
    Abstract: Electromagnetic wave structure modulation apparatus comprises an encoded device that has an electromagnetic wave-transparent material having a three-dimensional volume and electromagnetic wave-opaque walls, and a plurality of electromagnetic wave-opaque projections projecting into the electromagnetic wave-transparent material. The apparatus further comprises an interrogating device that has a transceiver operable to transmit an electromagnetic wave into the electromagnetic wave-transparent material, the electromagnetic wave being modulated and reflected by the electromagnetic wave-opaque walls and projections, an antenna operable to receive the reflected electromagnetic waves, and a decoder operable to decode the received reflected electromagnetic waves.
    Type: Application
    Filed: January 25, 2013
    Publication date: September 19, 2013
    Inventor: Duke Loi
  • 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
  • Patent number: 8525725
    Abstract: The present disclosure describes a method and system for detecting and determining the position of a target or intruder using a plurality of sensors positioned throughout a secured perimeter and a single antenna. The system of the present disclosure detects and determines the position of a target by first analyzing the return signal strength values of each of the sensors. Next, Zvalues for each of the sensors are calculated. Based on the Zvalues, certain sensors are selected to compute a signal strength center-of-mass location, which is then used to determine the position of the target.
    Type: Grant
    Filed: March 8, 2011
    Date of Patent: September 3, 2013
    Assignee: Lockheed Martin Corporation
    Inventors: Vibeke Libby, Troy E. Wenski, Allen R. Lorenz
  • Publication number: 20130222178
    Abstract: A dual mode ground penetrating radar includes an enclosure which houses radar electronics. The dual mode ground penetrating radar includes a enclosure housing radar electronics. The dual mode ground penetrating radar further includes a first antenna feed having ferrite loading and extending outside of the enclosure. The dual mode ground penetrating radar further includes a second antenna feed spaced apart from the first antenna feed, the second antenna feed having ferrite loading and extending outside of the enclosure. An RF signal is provided in at least one of the first and second antenna feeds by the radar electronics.
    Type: Application
    Filed: February 8, 2013
    Publication date: August 29, 2013
    Applicant: King Abdulaziz City for Science and Technology
    Inventor: King Abdulaziz City for Science and Technology