Fast Fourier Transform (fft) Patents (Class 342/196)
  • Patent number: 10209356
    Abstract: An image of a region of interest (ROI) is generated by a radar system including a set of one or more antennas. The radar system has unknown position perturbations. Pulses are transmitted, as a source signal, to the ROI using the set of antennas at different positions and echoes are received, as a reflected signal, by the set of antennas at the different positions. The reflected signal is deconvolved with the source signal to produce deconvolved data. The deconvolved data are compensated according a coherence between the reflected signal to produce compensated data. Then, a procedure is applied to the compensated data to produce reconstructed data, which are used to reconstruct auto focused images.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: February 19, 2019
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventor: Dehong Liu
  • Patent number: 10127821
    Abstract: An aircraft system includes a processing unit configured to identify an airport marker during a surface operation at an airport. The processing unit is further configured to automatically generate a reporting message based on the airport marker at a predetermined location relative to the airport marker. The aircraft system further includes a communications unit coupled to the processing unit and configured to send the reporting message.
    Type: Grant
    Filed: June 24, 2015
    Date of Patent: November 13, 2018
    Assignee: HONEYWELL INTERNATIONAL INC.
    Inventors: Padmashree Balasubramanian, Ravindra Jayaprakash
  • Patent number: 10028099
    Abstract: A locator assembly is provided. The locator assembly includes an article of wear and a location sending device embedded in the article of wear. A bio-related electric generator is connected to the location sending device for providing power for the location sending device. A system for locating a person and a locating method are also provided.
    Type: Grant
    Filed: December 14, 2015
    Date of Patent: July 17, 2018
    Assignee: Location Labs, Inc.
    Inventor: Andrew Weiss
  • Patent number: 9925984
    Abstract: Provided are a vehicle approach detection device and a vehicle approach detection method that are capable of detecting an approach of another vehicle without installing a dedicated device on a road. At least one of a vehicle surrounding video for showing an observed area (for example, road surface) used to observe irradiation light (for example, headlight beam emitted from a headlight of another vehicle) from another vehicle and a vehicle surrounding environmental sound is detected as vehicle external information, and it is determined based on the detected vehicle external information whether or not another vehicle is approaching an own vehicle.
    Type: Grant
    Filed: August 3, 2016
    Date of Patent: March 27, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoichi Kato, Takahisa Aoyagi
  • Patent number: 9778557
    Abstract: A method includes receiving from multiple transducers respective signals including reflections of a transmitted signal from a target. An image of the target is produced irrespective of sparsity of the received signals, by computing transducer-specific frequency-domain coefficients for each of the received signals, deriving, from the transducer-specific frequency-domain coefficients, beamforming frequency-domain coefficients of a beamformed signal in which the reflections received from a selected direction relative to the transducers are emphasized, and reconstructing the image of the target at the selected direction based on the beamforming frequency-domain coefficients.
    Type: Grant
    Filed: December 5, 2013
    Date of Patent: October 3, 2017
    Assignee: TECHNION RESEARCH & DEVELOPMENT FOUNDATION LTD.
    Inventors: Yonina Eldar, Tatiana Chernyakova, Ron Amit
  • Patent number: 9582630
    Abstract: One or more systems and methods for a cell based hybrid resistance and capacitance (RC) extraction are provided. The method includes generating a layout for a semiconductor arrangement, performing a three-dimensional (3D) RC extraction on a target unit cell to obtain a 3D RC result including a coupling capacitance between unit cells, generating a 3D RC netlist based upon the 3D RC result, performing a 2.5 dimensional (2.5D) RC extraction on a peripheral cell to obtain a 2.5D RC netlist, and combining the 3D RC netlist with the 2.5D RC netlist to create a hybrid RC netlist for the layout. In some embodiments, the hybrid RC netlist is generated by stitching the coupling capacitance for at least one of the target unit cell, a repeating unit cell, or the peripheral cell together. In some embodiments, the 3D RC result for the target unit cell is stitched to the repeating unit cell.
    Type: Grant
    Filed: August 28, 2014
    Date of Patent: February 28, 2017
    Assignee: Taiwan Semiconductor Manufacturing Company Limited
    Inventors: Ze-Ming Wu, Shih Hsin Chen, Chien-Chih Kuo, Kai-Ming Liu, Hsien-Hsin Sean Lee
  • Patent number: 9413060
    Abstract: A high performance broadband antenna for backpack and helmet application allowing data, video, and voice transmission between parties. The antenna consists of a pair of triangle shaped elements which are configured to stick on a backpack surface or place over a helmet with a coaxial cable connecting a radiating structure to the communication equipment on the body. A metal shielding performs as a ground plane and also acts as a protectant from radiation hazards to the head or body areas. The antenna is made with materials that conform to the shape of a helmet or stick directly onto a backpack surface. This design can function under multiple frequencies on UHF and S bands; its placement on a helmet receives less Interference from Its surroundings.
    Type: Grant
    Filed: May 22, 2014
    Date of Patent: August 9, 2016
    Inventors: Gary Gwoon Wong, Calvin Gwoon Wong, Perry Gwoon Wong, Kalem Gwoon Wong
  • Patent number: 9329266
    Abstract: According to one embodiment, a weather radar apparatus includes an antenna apparatus, a signal processing apparatus, a data converter, a forecasting unit, a state determination unit, and radar controller. The antenna apparatus radiates a radar pulse and receives a reflection pulse. The signal processing apparatus calculates a reception intensity, a Doppler speed, and a speed width. The data converter calculates rainfall intensity data and wind direction/speed data. The forecasting unit generates forecasting data based on the rainfall intensity data and on the wind direction/speed data. The state determination unit generates an observation sequence. The radar controller controls the antenna apparatus in accordance with the observation sequence.
    Type: Grant
    Filed: January 31, 2014
    Date of Patent: May 3, 2016
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Fumihiko Mizutani, Hideki Marui
  • Patent number: 9286667
    Abstract: A method of eliminating spurious echoes in SAR imaging comprises a step Etp1 of defining the SAR imaging parameters, a step Etp2 of calculating the spectrum of the signal received, in each distance bin, of a zone of interest 51, a step Etp3 of filtering the spectra in each distance bin, a step Etp4 of SAR imagette 51 formation and a step Etp5 of concatenating the SAR imagettes 51 to form the final SAR image.
    Type: Grant
    Filed: April 24, 2014
    Date of Patent: March 15, 2016
    Assignee: THALES
    Inventors: Nicolas Bon, Jean-Michel Quellec, Gabriel Marchalot
  • Patent number: 9182478
    Abstract: A radar device includes a signal generator that generates an intermittent signal having a prescribed signal width and signal interval, a transmission signal position adjuster that outputs a transmission signal while adjusting positions of the intermittent signal on the time axis, an RF transmitter that transmits the transmission signal, an RF receiver that receives a reception signal including reflection waves reflected from an object in a measurement subject space, an AD converter that converts the reception signal into a digital signal, and an object detector that detects the object based on the reception signal. The transmission signal position adjuster outputs a transmission signal in which positions of respective signal units of the intermittent signal on the time axis are adjusted in units of a time adjustment amount that is shorter than a sampling interval of the AD converter.
    Type: Grant
    Filed: September 12, 2011
    Date of Patent: November 10, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Hirohito Mukai, Takaaki Kishigami, Yoichi Nakagawa
  • Patent number: 9041592
    Abstract: A radar sensor and a method of detecting an object by using the same are provided. The method includes: receiving at least one radar signal reflected from the object; converting the received at least one radar signal to at least one signal in a frequency domain; accumulating the converted at least one signal for a predetermined time and extracting at least one feature from the accumulated at least one signal; and identifying the object by comparing the extracted at least one feature with at least one reference value stored in a database.
    Type: Grant
    Filed: October 12, 2012
    Date of Patent: May 26, 2015
    Assignee: SAMSUNG TECHWIN CO., LTD.
    Inventor: Ki-Yong Jeon
  • Patent number: 9041598
    Abstract: A method for processing return radar waveforms in response to transmitted radar waveforms. The method includes receiving, with a processor, a return radar waveform having a Doppler shift larger than Doppler tolerance. The method also includes separating, with the processor, the return radar waveform into a plurality of shortened waveforms. The method also includes compressing, with the processor, each of the plurality of shortened waveforms with a shortened form of the return radar waveform. The method also includes summing, with the processor, the plurality of compressed, shortened waveforms by computing a Doppler Fourier transform for each radar range bin of the return radar waveform using the plurality of compressed, shortened waveforms.
    Type: Grant
    Filed: June 22, 2011
    Date of Patent: May 26, 2015
    Assignee: Raytheon Company
    Inventor: Robert E. Crisler
  • Patent number: 9007258
    Abstract: An electronic scan type radar device which uses a high resolution performance processing to estimate directions of arrival of radio waves, wherein powers of arrival waves received for targets are accurately calculated, that is, a vehicle-mounted radar device utilizing electronic scan which uses a predetermined angle estimation system to estimate directions of arrival of reflected waves, comprising finding mode vectors for angles calculated from the receive signals of the antennas, decomposing a vector of the receive signals into directions of the mode vectors, and defining the lengths of the decomposed vectors the receive powers of the reflected waves arriving from the targets. Due to this method, even if there are targets, it is possible to accurately calculate the powers of the arrival waves, whereby pairing is accurately performed, the precision of detection of targets is improved, and erroneous operation of a vehicle-mounted radar device utilizing electronic scans is prevented.
    Type: Grant
    Filed: December 12, 2011
    Date of Patent: April 14, 2015
    Assignee: Fujitsu Ten Limited
    Inventor: Yasuhiro Kurono
  • Patent number: 8912950
    Abstract: This invention relates to sense through the wall radar. A main channel of a radar system (12) is operated at a frequency capable of penetrating opaque barriers such as the wall (24) of a building (22) to sense targets (16) therein. The main channel performance may be impaired by multipath interference, i.e., radar returns resulting from targets (20) outside the building (22) illuminated by reflection from the wall (24). A guard channel of the radar, operating at a higher frequency which does not penetrate the wall (24), is used to identify targets (20) outside the building (22) and suppress the multipath interference they produce in the main channel.
    Type: Grant
    Filed: March 23, 2012
    Date of Patent: December 16, 2014
    Assignee: Raytheon Company
    Inventor: Scott E. Adcook
  • 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: 8872697
    Abstract: The present invention uses a Single Instruction Multiple Data (SIMD) architecture to form real time 3D radar images recorded in cylindrical near field scenarios using a wavefront reconstruction approach. A novel interpolation approach is executed in parallel, significantly reducing the reconstruction time without compromising the spatial accuracy and signal to noise ratios of the resulting images. Since each point in the problem space can be processed independently, the proposed technique was implemented using an approach on a General Purpose Graphics Processing Unit (GPGPU) to take advantage of the high performance computing capabilities of this platform.
    Type: Grant
    Filed: August 15, 2012
    Date of Patent: October 28, 2014
    Inventors: Daniel Flores Tapia, Stephen Pistorius
  • Patent number: 8874390
    Abstract: An instrument (100) is provided according to an embodiment of the invention. The instrument (100) includes an interface (101) configured to receive a Doppler measurement signal and a processing system (112) coupled to the interface (101) and receiving the Doppler measurement signal. The processing system (112) is configured to generate a two-sided velocity spectrum including a plurality of discrete frequency bins from the Doppler measurement signal, with the two-sided velocity spectrum distinguishing spectral elements, and process one or more velocity spectrum bin pairs against a plurality of local gate thresholds, with the one or more velocity spectrum bin pairs being substantially symmetrically located about one or more carrier wave bins and wherein each velocity spectrum bin pair is processed against a corresponding local gate threshold of the plurality of local gate thresholds.
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: October 28, 2014
    Assignee: Hach Company
    Inventor: David Langley Rick
  • Patent number: 8866668
    Abstract: In a radar apparatus, a peak extractor performs frequency analysis on a beat signal to obtain a frequency spectrum for each of first and second detection modes based on the beat signal for a corresponding one of the first and second detection modes. The peak extractor extracts a plurality of first peak-signal components from the frequency spectrum obtained for the first detection mode, and a plurality of second peak-signal components from the frequency spectrum obtained for the second detection mode. A determiner compares each of the plurality of first peak-signal components with a corresponding one of the plurality of second peak-signal components to deter mine whether a noise is included in the beat signal according to a result of the comparison.
    Type: Grant
    Filed: October 30, 2012
    Date of Patent: October 21, 2014
    Assignee: Denso Corporation
    Inventor: Hideki Kitagawa
  • Patent number: 8854251
    Abstract: Provided is an object identification device and a method for the same that are capable of identifying a three-dimensional object and a road surface static object, irrespective of situations. The object identification device identifies an object, based on a transmission signal and a reflection signal caused by the object reflecting the transmission signal. The object identification device includes: a measurement section configured to measure at least one of the relative distance and the relative velocity with respect to the object; an intensity detection section configured to detect the intensity of the reflection signal; and an object identification section configured to identify the object which can be an obstacle object, based on at least one of the relative velocity and the variation in the relative distance, and on the variation in the intensity.
    Type: Grant
    Filed: June 16, 2010
    Date of Patent: October 7, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Setsuo Tokoro
  • Patent number: 8847815
    Abstract: An electronic scanning radar apparatus mounted on a moving object includes a receiving unit including a plurality of antennas receiving a received wave arriving from a target having reflected a transmitted wave, a beat signal generating unit generating a beat signal from the transmitted wave and the received wave, a frequency resolving unit resolving the beat signal in beat frequencies and to calculate complex data based on the beat signal resolved for each beat frequency, and an azimuth detecting unit calculating a direction of arrival of the received wave based on original complex data calculated based on the beat signal, wherein the azimuth detecting unit includes a data extending unit generating extended complex data by extending the number of data based on the original complex data, and a first computation processing unit calculating the direction of arrival of the received wave based on the extended complex data.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: September 30, 2014
    Assignee: Honda elesys Co., Ltd.
    Inventor: Junji Kanamoto
  • Patent number: 8842035
    Abstract: An apparatus includes an extendable wand, and a sensor head coupled to the wand. The sensor head includes a continuous wave metal detector (CWMD) and a radar. When the wand is collapsed, the wand and the sensor head collapse to fill a volume that is smaller than a volume filled by the sensor head and the wand when the wand is extended. Frequency-domain data from a sensor configured to sense a region is accessed, the frequency-domain data is transformed to generate a time-domain representation of the region, a first model is determined based on the accessed frequency-domain data, a second model is determined based on the generated time-domain representation, the second model being associated with a particular region within the sensed region, and a background model that represents a background of the region is determined based on the first model and the second model.
    Type: Grant
    Filed: April 6, 2011
    Date of Patent: September 23, 2014
    Assignee: L-3 Communications Security and Detection Systems, Inc.
    Inventors: Herbert Duvoisin, III, Juan Antonio Torres-Rosario, Christopher Gary Sentelle, Douglas O. Carlson, Glen A. Holman, Marquette Trishaun
  • Patent number: 8823582
    Abstract: An FMCW radar sensor system is described having an antenna covered by a radome, a mixer for mixing a frequency-modulated transmission signal with a signal received by the antenna, a device for recording the mixed product of the mixer as a time-dependent signal, a device for calculating the spectrum of the time-dependent signal, and a device for detecting a reflecting coating on the radome, characterized in that the device for detecting the reflecting coating is configured for analyzing the time-dependent signal and for determining the extent of reflection on the radome based on the amplitude of this signal.
    Type: Grant
    Filed: December 28, 2009
    Date of Patent: September 2, 2014
    Assignee: Robert Bosch GmbH
    Inventors: Armin Himmelstoss, Stefan Heilmann, Goetz Kuehnle, Dirk Bechler, Elisabeth Hauk, Rahel Hauk, Manuel Hauk
  • Patent number: 8816902
    Abstract: There is provided a radar apparatus for detecting a target. A detection signal generating unit generates detection signals of the target based on transmission and reception waves of antennas. A detection signal processing unit performs frequency analysis on the detection signals to extract signal components of the target, and performs a predetermined process on the signal components to calculate at least one of a distance to the target, a relative speed to the target, and an orientation of the target. The detection signal generating unit includes a filter unit for giving changes to the detection signals in a frequency bandwidth higher than Nyquist frequency which is a half a sampling frequency. The detection signal processing unit acquires the signal components from the detection signals to which the filter unit gives the changes to determine whether the signal components are generated by replication due to the Nyquist frequency.
    Type: Grant
    Filed: May 16, 2012
    Date of Patent: August 26, 2014
    Assignee: Fujitsu Ten Limited
    Inventor: Hiroshi Itoh
  • Publication number: 20140232586
    Abstract: A device for radar applications includes a computing engine, a radar acquisition unit connected to the computing engine, a timer unit connected to the computing engine, a cascade input port, and a cascade output port. The cascade input port is configured to convey an input signal to the computing engine and the cascade output port is configured to convey an output signal from the computing engine. Further, an according system, a radar system, a vehicle with such radar system and a method are provided.
    Type: Application
    Filed: February 19, 2013
    Publication date: August 21, 2014
    Applicant: Infineon Technologies AG
    Inventors: Romain Ygnace, Andre Roger
  • Patent number: 8803730
    Abstract: A system, method, and apparatus for radar pulse detection using a digital radar receiver are disclosed herein. In electronic warfare (EW), radars operate in an environment with highly dense electronic waveforms. As a result, the radars may receive thousands or millions of radar pulses every second. To detect and sort out radar pulses emitted from different radars is a challenging problem in electronic warfare. The present disclosure teaches a radar pulse detection system that utilizes digital channelization and joint-channel detection techniques to detect and separate radar pulses that are sent from different radar emitters. The main features of the present disclosure are: 1.) a digital channelization technique to separate radar pulses from their mixtures; 2.) a multi-channel detection technique to detect radar pulses; and 3.) an innovative technique to separate overlapped radar pulses.
    Type: Grant
    Filed: July 21, 2011
    Date of Patent: August 12, 2014
    Assignee: The Boeing Company
    Inventor: Qin Jiang
  • Patent number: 8791856
    Abstract: Systems and methods for automatically determining a noise threshold are provided. In one implementation, a system comprises: an antenna configured to gather data about a surrounding environment; a processing unit configured to remove samples representing target data from the gathered data; to estimate the noise floor from the gathered data with the removed target data; and to determine a noise threshold from the estimated noise floor; and a memory device configured to store the estimated noise floor.
    Type: Grant
    Filed: April 6, 2011
    Date of Patent: July 29, 2014
    Assignee: Honeywell International Inc.
    Inventors: David C. Vacanti, Radde Majeed, Anthony H. Luk
  • Publication number: 20140159947
    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: Application
    Filed: December 6, 2012
    Publication date: June 12, 2014
    Inventors: YAO-HWA WEN, MIN-FANG LO
  • 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: 8718153
    Abstract: The present invention relates to a signal transmitting apparatus, a method thereof, and an inverse fast Fourier transform (IFFT) apparatus for a signal transmitting apparatus. A signal transmitting apparatus according to an embodiment of the present invention receives data, and performs inverse fast Fourier transform (IFFT) on the data on the basis of a twiddle factor for shifting output data by the size of a cyclic prefix. In addition, the signal transmitting apparatus sequentially stores data corresponding to the size of the cyclic prefix starting with initial data among the transformed data, and generates an OFDM symbol on the basis of the stored data and the transformed data. According to the embodiment of the present invention, it is possible to efficiently reduce a time delay and a memory use amount when a cyclic prefix is added at a transmitting end, without changing the size of hardware and power consumption.
    Type: Grant
    Filed: April 17, 2008
    Date of Patent: May 6, 2014
    Assignees: Samsung Electronics Co., Ltd., Electronics and Telecommunications Research Institute
    Inventors: Jun-Woo Kim, Dae-Ho Kim, Young-Ha Lee, Youn-Ok Park
  • Patent number: 8681038
    Abstract: Described are computer-based methods and apparatuses, including computer program products, for radar data processing. In some examples, the method includes determining a plurality of substantially equally spaced frequency intervals within radar data based on an interval size; transforming parts of the radar data within each of the plurality of substantially equally spaced frequency intervals; determining a magnitude of each of the transformed parts of the radar data; and summing the magnitude for each of the transformed parts of the radar data to form adaptive radar data. The adaptive radar data can have a higher signal-to-noise ratio than the radar data.
    Type: Grant
    Filed: March 9, 2011
    Date of Patent: March 25, 2014
    Assignee: Raytheon Company
    Inventors: Arjang J. Noushin, Kenric P. Nelson
  • Patent number: 8682821
    Abstract: A method of detecting movement includes using a radar sensor to monitor a space, and receiving an output signal from the radar sensor. A Fourier transform is performed on the output signal to produce a frequency domain signal spectrum. The frequency domain signal spectrum is transformed into an acoustic domain signal. It is decided whether the output signal is indicative of movement of a predetermined object or a non-human animal dependent upon at least one feature of the acoustic domain signal and at least one spectral feature of the signal spectrum.
    Type: Grant
    Filed: August 8, 2011
    Date of Patent: March 25, 2014
    Assignee: Robert Bosch GmbH
    Inventors: Diego Benitez, Zhaozhang Jin
  • Patent number: 8619908
    Abstract: A wireless ranging system for determining a range of a remote wireless device may include a wireless transmitter and a wireless receiver. The wireless ranging system may also include a ranging controller to cooperate with the wireless transmitter and receiver to generate a multi-carrier base waveform, transmit a sounder waveform to the remote wireless device including concatenated copies of the multi-carrier base waveform, and receive a return waveform from the remote wireless device in response to the sounder waveform. The ranging controller may also generate time domain samples from the return waveform, convert the time domain samples into frequency domain data, and process the frequency domain data to determine the range of the remote wireless device.
    Type: Grant
    Filed: December 2, 2009
    Date of Patent: December 31, 2013
    Assignee: Harris Corporation
    Inventors: John E. Hoffmann, Carlos G. Abascal, Christopher D. Moffatt
  • 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: 8599061
    Abstract: An apparatus for detecting a cavity comprising a signal receiver, a signal analyzer and a threshold excedent determination processor. The signal receiver receives a reflected signal resulting from an interaction of multi-frequency irradiating signal(s) with at least one cavity. The irradiating signal may include an electromagnetic or acoustic signal above a cavity dependent cutoff frequency with a randomized spectral component. The signal analyzer computes cavity detecting statistic(s) of the reflected signal. The cavity detecting statistic(s) may include an autocorrelation function. The autocorrelation function may be a Fourier transform of the power spectral density of the reflected signal. The threshold excedent determination processor generates a notification when cavity detecting statistic(s) exceed a threshold. The threshold may include a multi-variable function. The cavity may be the bore of a weapon. The apparatus may be configured to determine the bearing from the cavity to the apparatus.
    Type: Grant
    Filed: October 22, 2010
    Date of Patent: December 3, 2013
    Assignee: George Mason Intellectual Properties, Inc.
    Inventor: Kenneth J Hintz
  • 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: 8570208
    Abstract: A radar tomography apparatus and method determines one or more material properties of an object at a first number of positions distributed within a region of interest of said object. The apparatus includes one or more transmitters that transmit radiation, in particular microwave radiation, in the direction of the region of interest of the object, a plurality of receivers that receive radiation reflected from or transmitted through the region of interest of the object, a processor that processes the received radiation, said processor including a forward solver that determines electromagnetic field values at a second number of positions distributed in the region of interest from the received radiation.
    Type: Grant
    Filed: July 7, 2011
    Date of Patent: October 29, 2013
    Assignee: Sony Corporation
    Inventor: Michel Sarkis
  • Patent number: 8493265
    Abstract: A method includes: generating a frequency-modulated continuous signal, an emission sequence being formed of successive ramps centered on a carrier frequency; fixing a modulation band ?F and the duration Tr of a recurrence in such a way that at the range limit, a reception ramp appears shifted by at least one given frequency with respect to the corresponding emission ramp, on account of the propagation delay for the outward-return journey to a target kTr+?, k being an integer and ? a duration less than Tr; demodulating the signal received by the signal emitted, the resulting signal including a first sinusoid at the frequency ?Fdim=(1?(?/Tr)·?F and a second sinusoid at the frequency ?Fd=(?/Tr)·?F; sampling the resulting signal and performing a first fast Fourier transformation on this resulting signal over the duration of each emission ramp; detecting in the resulting spectrum the spectral lines appearing at the frequencies ?Fd and ?Fdim, and performing the vector sum of these two spectral lines after resetting
    Type: Grant
    Filed: December 16, 2010
    Date of Patent: July 23, 2013
    Assignee: Thales
    Inventors: Pascal Cornic, Patrick Le Bihan, Stéphane Kemkemian
  • Patent number: 8466834
    Abstract: A method of radar-imaging a scene in the far-field of a one-dimensional radar array, comprises providing an array of backscatter data D(fm, x?n) of the scene, these backscatter data being associated to a plurality of positions x?n, n=0 . . . N?1, N>1, that are regularly spaced along an axis of the radar array. The backscatter data for each radar array position x?n are sampled in frequency domain, at different frequencies fm, m=0 . . . M?1, M>1, defined by fm=fc?B/2+m??f, where fc represents the center frequency, B the bandwidth and ?f the frequency step of the sampling. A radar reflectivity image 1 (?m?, ?n?) is computed in a pseudo-polar coordinate system based upon the formula (2) with formula (3) where j represents the imaginary unit, formula (A) is the baseband frequency, FFT2D denotes the 2D Fast Fourier Transform operator, ?m?, m?=0 . . . M?1, and ?n?, n?=0 . . .
    Type: Grant
    Filed: May 4, 2009
    Date of Patent: June 18, 2013
    Assignee: The European Union, Represented by the European Commission
    Inventor: Joaquim Fortuny-Guasch
  • Patent number: 8466832
    Abstract: Doppler-inspired methods for signal generation and frequency up-conversion are provided that are compatible with CMOS technology. In accordance with an embodiment, a circuit is provided that includes two input signals that can propagate on artificial transmission lines in opposite directions, resembling the relative movement of source and observer in Doppler frequency shift; and an output signal combiner. By controlling the characteristics of the transmission lines and the input signal frequencies, the harmonic generation of active devices is utilized and combined to provide the desired high-frequency component at the output.
    Type: Grant
    Filed: September 28, 2010
    Date of Patent: June 18, 2013
    Assignee: Cornell University
    Inventors: Ehsan Afshari, Omeed Momeni
  • Patent number: 8416119
    Abstract: According to one embodiment, a weather radar apparatus includes a transmitting/receiving unit configured to transmit a radar wave to an observation target and receive a reflected wave, a distribution unit configured to distribute a received signal of the reflected wave to a main path and at least another path, an extraction unit configured to extract, from a signal of the other path, an interference wave signal extracted from another radio station, and a removing unit configured to remove the interference wave signal extracted from a signal of the main path.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: April 9, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Fumihiko Mizutani, Masakazu Wada, Hiroshi Ishizawa
  • Patent number: 8416121
    Abstract: A frequency modulation continuous wave (FMCW) system includes a first memory receiving a clock signal and storing voltage digital values of I FMCW signals, a second memory receiving the clock signal and storing the voltage digital values of the Q FMCW signals, a first digital-to-analog converter (DAC) connected to the first memory and receiving the clock signal for converting the voltage digital values of the I FMCW signal to a first analog voltage, a second digital-to-analog converter (DAC) connected to the second memory and receiving the clock signal for converting the voltage digital values of the Q FMCW signal to a second analog voltage, an I low-pass filter connected to the first DAC smoothing the I FMCW signal and a Q low-pass filter connected to the second DAC smoothing the Q FMCW signal.
    Type: Grant
    Filed: December 8, 2010
    Date of Patent: April 9, 2013
    Assignee: International Business Machines Corporation
    Inventors: Howard H. Chen, Kai D. Feng, Duixian Liu
  • Patent number: 8400346
    Abstract: A method comprises transmitting a radar signal into an target area, receiving reflected portions of the radar signal from the target area, and processing the reflected portions of the radar signal. The step of processing comprises windowing analog signals representative of the reflected portions of the radar signal, performing a fast Fourier transform on the windowed analog signals to produce an FFT result for each window, and obtaining the average of the FFT results from consecutive windows. In accordance with the method, a user receives indication from an indicator that a golf ball is present in the target area when the average of the FFT results corresponds to characteristics of the golf ball. The system comprises a radar transceiver, a processor for processing reflected portions of the radar signal, and an indicator indicating to the user a golf ball present in the target area.
    Type: Grant
    Filed: June 25, 2010
    Date of Patent: March 19, 2013
    Assignee: Glass Wind, LLC
    Inventors: Kevin M. Hubbard, Dennis P. Bevirt
  • Patent number: 8391336
    Abstract: To generate a pulse for ranging, a kernel is convolved with a spreading sequence. The spreading sequence is parametrized by one or more ordered (length, sparsity) pairs, such that the first sparsity differs from the bit length of the kernel and/or a subsequent sparsity differs from the product of the immediately preceding length and the immediately preceding sparsity. Alternatively, a kernel is convolved with an ordered plurality of spreading sequences, all but the first of which may be non-binary. The pulse is launched towards a target. The reflection from the target is transformed to a received reflection, compressed by deconvolution of the spreading sequence, and post-processed to provide a range to the target and/or a direction of arrival from the target.
    Type: Grant
    Filed: March 7, 2011
    Date of Patent: March 5, 2013
    Assignee: A.P.M. Automation Solutions Ltd
    Inventor: Alex Chiskis
  • Patent number: 8384588
    Abstract: A method for estimating a target angle of a wideband signal received on an electronically steered antenna array includes: generating spatial frequency data from the received wideband signal; stabilizing the spatial frequency data to a beam steering direction; compressing the stabilized spatial frequency data to a plurality of frequency range bins; calculating a monopulse discriminant from the stabilized spatial frequency data; and calculating the target angle using the monopulse discriminant.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: February 26, 2013
    Assignee: Raytheon Company
    Inventor: Charles T. Hansen
  • Patent number: 8378882
    Abstract: A method for operating a radar, having the following steps: determining first and second differential signals from a first and second transmitted frequency-modulated signal and received components of the first and second transmitted frequency-modulated signal reflected by a plurality of objects; determining in each case one first and one second chirp signal for each first and the second differential signal, the first chirp signal corresponding to the double differentiation of the phase of the first and the second differential signal with respect to time; assigning one of the first differential signals to one of the second differential signals, based on a correspondence of the first chirp signal, that is assigned to the one first differential signal, to the second chirp signal that is assigned to the one second differential signal; and determining the separation distance and/or the relative speed of one of the objects, based on the one first differential signal and the one second differential signal assigned t
    Type: Grant
    Filed: December 4, 2007
    Date of Patent: February 19, 2013
    Assignee: Robert Bosch GmbH
    Inventor: Wolf Steffens
  • Patent number: 8378878
    Abstract: A new approach to radar imaging is described herein, in which radar pulses are transmitted wi th 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: August 5, 2010
    Date of Patent: February 19, 2013
    Assignee: Areté Associates
    Inventors: Jeremy Francis Burri, Michael Howard Farris, Matthew Michael Pohlman, Randall Edward Potter
  • Patent number: 8368586
    Abstract: A system includes a multi-system approach to detecting concealed weapons and person borne improvised explosive devices (PBIED). A first and second radar system operate at different center frequencies to provide, respectively, isolation of a target of interest from clutter and fine detail information on the target, such as whether the target is a living person, whether a concealed object may be present, material composition of the object, and shape, size, and position of the target relative to the system. Circular polarized radar beam may be used to distinguish a suspect object from within a crowd of people. Radar image of the object may be overlaid on visual image of a person carrying the object. Radar tracking of the object is coordinated with visual tracking of the target provided by a camera system, with visual display and tracking of the target overlaid with the radar information.
    Type: Grant
    Filed: August 6, 2010
    Date of Patent: February 5, 2013
    Assignee: Tialinx, Inc.
    Inventors: Farrokh Mohamadi, Mikko Oijala, Mohsen Zolghadri, Paul Strauch
  • Patent number: 8362947
    Abstract: The invention provides a method for obtaining the object-plane field without a pure theoretical estimation or a direct experimental measurement of a point spread function (PSF) of an imaging system. Instead, at least two image-plane fields have to be recorded. It is essential that the resolutions of the system producing the images have to be quite different from each other. Although both PSFs of the system are unknown, the recording conditions have to be chosen so that the second PSF could be expressed via the first PSF. Two integral equations—(1) a convolution of the object-plane field with the first PSF and (2) a convolution of the object-plane field with the second PSF (expressed via the first PSF)—can be reduced to one functional equation in the Fourier space. The reverse Fourier transform of the solution of this equation is the object-plane field.
    Type: Grant
    Filed: March 29, 2011
    Date of Patent: January 29, 2013
    Inventor: Victor Gorelik
  • Patent number: 8358233
    Abstract: A process is provided for analyzing a radar signal using CLEAN to identify an undetected target in sidelobes of a detected target. The process includes obtaining system impulse response data of a waveform for a point target having a signal data vector based on a convolution under conjugate transpose multiplied by a target amplitude vector plus a noise vector, estimating the target amplitude vector, and applying a CLEAN Deconvolver to remove the detected target from the data signal vector based on the estimate amplitude vector absent the detected target and an amplitude vector of an undetected target. The process further includes building a detected target vector with the amplitude estimate vector, setting to zero all elements of the detected target vector except at an initial time, and recomputing the amplitude estimate vector by a Reformulated CLEAN Detector.
    Type: Grant
    Filed: September 14, 2010
    Date of Patent: January 22, 2013
    Assignee: The United States of America as Represented by the Secretary of the Navy
    Inventor: Terry L. Foreman
  • Patent number: RE45061
    Abstract: Communication between a remote locator and a transponder is used to determine the relative position of the transponder. The transponder and locator each include a transmitter and a receiver. The locator transmits an inquiry in the form of a relatively powerful cyclically encoded signal with repetitive elements, uniquely associated with a target transponder. Periodically, each transponder correlates its coded ID against a possible inquiry signal, determining frequency, phase and framing in the process. Upon a match, the transponder transmits a synthesized response coherent with the received signal. The locator integrates multiple cyclical response elements, allowing low-power transmissions from the transponder. The locator correlates the integrated response, determines round-trip Doppler shift, time-of-flight, and then computes the distance and angle to the transponder. The transponder can be wearable, bionically implanted, or attached to, or embedded in, some object.
    Type: Grant
    Filed: January 11, 2012
    Date of Patent: August 5, 2014
    Assignee: Santa Monica Semiconductor, LLC
    Inventor: Lawrence J. Karr