Constant False Alarm Rate (cfar) Patents (Class 342/93)
  • Patent number: 11061113
    Abstract: The disclosed systems, structures, and methods are directed to an object detection system, employing a receiver configured to receive a signal reflected from an object, an analog-to-digital converter (ADC) configured to convert the received signal into a digital signal, a pre-processor configured to improve a signal-to-noise (SNR) of the digital signal and to generate a pre-processed signal corresponding to the digital signal, a parameter extractor configured to calculate a number of reference cells M and a multiplication factor K0, and a Constant False Alarm Rate (CFAR) processor configured to analyze a cell-under-test (CUT) and M reference cells in accordance with the number of reference cells M and the multiplication factor K0 to detect the presence of the object.
    Type: Grant
    Filed: September 30, 2020
    Date of Patent: July 13, 2021
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Ali Ahmed Ali Massoud, Zhiping Jiang, Hongbiao Gao
  • Patent number: 11047974
    Abstract: A system for virtual Doppler and/or aperture enhancement, preferably including one or more transmitter arrays, receiver arrays, and/or signal processors, and optionally including one or more velocity sensing modules. A method for virtual Doppler and/or aperture enhancement, preferably including transmitting a set of probe signals, receiving a set of reflected probe signals, and/or analyzing the set of received probe signals.
    Type: Grant
    Filed: December 10, 2020
    Date of Patent: June 29, 2021
    Assignee: Oculii Corp.
    Inventors: Lang Hong, Steven Hong
  • Patent number: 10969463
    Abstract: A method for processing radar data is described herein. In accordance with one embodiment, the method includes the calculation of a Range Map based on a digital radar signal received from a radar receiver. The Range Map includes spectral values for a plurality of discrete frequency values and a plurality of discrete time values, wherein each spectral value is represented by at least a first parameter. Further, the method includes applying an operation to at least the first parameters in the Range Map for at least one discrete frequency value to smooth or analyze at least a portion of the Range Map.
    Type: Grant
    Filed: October 11, 2018
    Date of Patent: April 6, 2021
    Assignee: Infineon Technologies AG
    Inventors: Alexander Melzer, Mario Huemer, Paul Meissner, Alexander Onic, Rainer Stuhlberger, Fisnik Sulejmani, Matthias Wagner
  • Patent number: 10935634
    Abstract: The application discloses a method for verifying the accuracy of a guided-wave radar measuring device used in process automation. The method includes sending measuring radar waves to a built-in verification circuit of a known and verified length and performing time-of-flight analysis on the measuring radar wave reflected by the built-in verification circuit. The application also discloses a guided-wave radar device having a built-in verification circuit.
    Type: Grant
    Filed: June 1, 2018
    Date of Patent: March 2, 2021
    Assignee: Endress+Hauser SE+Co. KG
    Inventor: Rob Vermeulen
  • Patent number: 10634783
    Abstract: An accelerator device for use in generating a list of potential targets in a radar system, such as an anti-collision radar for a motor vehicle, may process radar data signals arranged in cells stored in a system memory. A cell under test in is identified as a potential target if the cell under test is a local peak over boundary cells and is higher than a certain threshold calculated by sorting range and velocity radar data signals arranged in windows. The cells identified as a potential target are sorted in a sorted list of potential targets. The accelerator device may include a double-buffering local memory for storing cell under test and boundary cell data; and a first and a second sorting unit for performing concurrent sorting of the radar data signals arranged in windows and the cells identified as a potential target in pipeline with accesses to the system memory.
    Type: Grant
    Filed: December 10, 2018
    Date of Patent: April 28, 2020
    Assignee: STMICROELECTRONICS S.R.L.
    Inventors: Giampiero Borgonovo, Marco Montagnana
  • Patent number: 10317520
    Abstract: A radar system includes an image forming circuit that provides a two-dimensional image of an operating environment. The image includes pixel elements representative of the operating environment. The system includes at least one filter configured to convert the two-dimensional image into a clutter classification map of clutter regions. A predetermined number of clutter regions are selected as training cells for a predetermined cell-under-test (CUT). A space-time adaptive processor (STAP) is configured to derive a weighted filter from training cell data. The STAP applies the weighted filter to a digital return signal associated with the predetermined CUT to provide a STAP-filtered digital return signal having the clutter signal components substantially eliminated therefrom.
    Type: Grant
    Filed: March 18, 2016
    Date of Patent: June 11, 2019
    Assignee: SRC, Inc.
    Inventors: Christopher Thomas Capraro, Eva Beth Piltch, Jason Michael Steeger
  • Patent number: 10225672
    Abstract: Loud sounds with fast rise times, like gunfire and explosions, can cause noise-induced hearing loss (NIHL). Unfortunately, current models do not adequately explain how impulsive sounds cause NIHL, which makes it difficult to predict and prevent NIHL on battlefields and other hostile or rugged environments. Fortunately, the impulsive sounds experienced by soldiers and others working in rugged environments can be recorded using a compact, portable system that acquires, digitizes, and stores high-bandwidth audio data. An example of this system can be mounted on a helmet or other article and used to record hours of audio data at a bandwidth of 20 kHz or higher, which is broad enough to capture sounds with rise times less than 50 ms. An analog-to-digital converter (ADC) digitizes these broadband audio signals at rate of 40 kHz or higher to preserve the impulse information. A processor transfers the digitized samples from a buffer to a memory card for later retrieval using an interrupt-driven processing technique.
    Type: Grant
    Filed: April 17, 2018
    Date of Patent: March 5, 2019
    Assignee: Massachusetts Institute of Technology
    Inventors: Joseph J. Lacirignola, Trina Rae Vian, David F. Aubin, Jr., Thomas F. Quatieri, Kate D. Fischl, Paula P. Collins, Christopher J. Smalt, Paul D. Gatewood, Nicolas Malyska, David C. Maurer
  • Patent number: 9747894
    Abstract: The invention provides a system for speech keyword detection and associated method. The system includes a speech keyword detector, an activity predictor and a decision maker. The activity predictor obtains sensor data provided by a plurality of sensors, and processes the sensor data to provide an activity prediction result indicating a probability for whether a user is about to give voice keyword. The decision maker processes the activity prediction result and a preliminary keyword detection result of the speech keyword detection to provide a keyword detection result.
    Type: Grant
    Filed: January 29, 2014
    Date of Patent: August 29, 2017
    Assignee: MEDIATEK INC.
    Inventors: Chao-Ling Hsu, Yiou-Wen Cheng, Liang-Che Sun, Yuanyuan Wang
  • Patent number: 9746549
    Abstract: Integrated circuits may include a constant false alarm rate (CFAR) detection circuit, which may identify targets among clutter and noise in a range-Doppler map. The CFAR detection circuit may compute power values for each cell in the range-Doppler map and scan the range-Doppler map cell by cell. For this purpose, the CFAR detection circuit may compute a target value for a cell-under-test and surrounding cells and a noise value for one or more regions in local proximity of the cell-under-test on the range-Doppler map. For example, the CFAR detection circuit may perform a two-dimensional filtering to compute the target value and compute a sum of accumulated power values weighted by predetermined coefficients. The predetermined coefficients may taper at edges of the range-Doppler map and/or at edges of the regions. The CFAR detection circuit may declare a target based on a comparison of the target value and noise value.
    Type: Grant
    Filed: July 11, 2014
    Date of Patent: August 29, 2017
    Assignee: Altera Corporation
    Inventor: Michael Alan Parker
  • Patent number: 9478229
    Abstract: Loud sounds with fast rise times, like gunfire and explosions, can cause noise-induced hearing loss (NIHL). Unfortunately, current models do not adequately explain how impulsive sounds cause NIHL, which makes it difficult to predict and prevent NIHL on battlefields and other hostile or rugged environments. Fortunately, the impulsive sounds experienced by soldiers and others working in rugged environments can be recorded using a compact, portable system that acquires, digitizes, and stores high-bandwidth audio data. An example of this system can be mounted on a helmet or other article and used to record hours of audio data at a bandwidth of 20 kHz or higher, which is broad enough to capture sounds with rise times less than 50 ms. An analog-to-digital converter (ADC) digitizes these broadband audio signals at rate of 40 kHz or higher to preserve the impulse information. A processor transfers the digitized samples from a buffer to a memory card for later retrieval using an interrupt-driven processing technique.
    Type: Grant
    Filed: December 10, 2013
    Date of Patent: October 25, 2016
    Assignee: Massachusetts Institute of Technology
    Inventors: Joseph J. Lacirignola, Trina Rae Vian, David F. Aubin, Jr., Thomas F. Quatieri, Kate D. Fischl, Paula P. Collins, Christopher J. Smalt, Paul D. Gatewood, Nicolas Malyska, David C. Maurer
  • Patent number: 9279881
    Abstract: A radar detector suppresses alerts from vehicle guidance systems, by sweeping for a consistent radar signal; the center frequency of the signal is stored and the detector suppresses warnings of radar signals near that frequency. The detector uses an enhanced method for suppression of signals near a known location of a false signal source; in the event the detector detects a radar signal and finds a matching stored false signal, the detector will first compare the strength of the received signal to a threshold strength that is computed based upon the distance of the detector from the stored false signal, and will only suppress signals below threshold. The detector includes a camera directed to the road in the vicinity of the vehicle. Image data from the camera is processed to identify police vehicles as identified by flashing lights, a profile including a rooftop light bar and/or highly contrasting colored panels.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: March 8, 2016
    Assignee: Escort Inc.
    Inventors: Steven K. Orr, John Kuhn, Jeff Stevens, Thomas W. Humphrey
  • Patent number: 9274211
    Abstract: A target object detection device is provided. The device includes a transmitter for transmitting at least one transmission wave in a predetermined azimuth, an echo signal receiver for receiving echo signals of the transmission waves, an echo signal suppressor for suppressing levels of the echo signals corresponding to sampling positions, a target object detector for detecting the target object(s) based on the level-suppressed echo signals, a first updater for comparing amplitude level(s) of echo signals of sampling positions, with the threshold that is set in association with the first distance, and determining to update the values with a new threshold and a new suppression value, and a second updater for comparing amplitude level(s) of echo signals of sampling positions, with the threshold that is set in association with the second distance, and determining to update the values with a new threshold and a new suppression value.
    Type: Grant
    Filed: June 20, 2013
    Date of Patent: March 1, 2016
    Assignee: Furuno Electric Co., Ltd.
    Inventor: Hitoshi Maeno
  • Patent number: 9234961
    Abstract: A radar device is provided, which includes a receiver for transmitting a pulse-shaped radio wave and receiving a corresponding reflection signal as a reception signal, a Doppler processor for generating Doppler processed signals that are signals obtained by separating the reception signal according to Doppler frequencies or signals obtained based on the signals separated, an improvement level calculator for calculating a signal improvement level by comparing an amplitude value of the reception signal with amplitude values of the Doppler processed signals, a signal synthesizer for synthesizing the reception signal and the Doppler processed signals based on the signal improvement levels, and a display processor for generating a radar image based on the synthesized signal.
    Type: Grant
    Filed: June 19, 2013
    Date of Patent: January 12, 2016
    Assignee: Furuno Electric Co., Ltd.
    Inventors: Koji Dai, Tatsuya Kojima
  • Patent number: 9213088
    Abstract: Sidelobe suppression methods and systems for use in processing radar video streams generated by rotational radar antenna scanners. The sidelobe suppression methods function in parallel with traditional Sensitivity Control (SC) processing by selectively reducing sensitivity where necessary depending on sidelobe suppression schemes that can be either directional, omni-directional (non-directional), or a combination of these.
    Type: Grant
    Filed: May 17, 2012
    Date of Patent: December 15, 2015
    Assignee: Navico Holding AS
    Inventors: Robert Stephen Mowbray, Roger Phillips
  • Patent number: 9203561
    Abstract: High speed serial links are used in many applications as they provide high throughput with limited number of signals and input/output pins. Normally, the high speed links are established once at power up and rarely taken down except for maintenance purposes. When the high speed serial links are used for battery operated devices, the power consumption of these links becomes an important issue. Dynamic high speed serial link establishment and shutdown techniques are used in such application to keep the power consumption low. Frequent link establishment and shutdown may cause occasional link establishment failures leading to latencies and even complete failure to communicate between two entities. A method and apparatus are disclosed that enable robust link establishment for more reliable operation and reduced latency.
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: December 1, 2015
    Assignee: MBIT WIRELESS, INC.
    Inventors: Bhaskar Patel, Arumugam Govindswamy
  • Patent number: 9157992
    Abstract: Various embodiments are described herein for a detector and method that perform various types of CFAR detection on radar data including knowledge-aided CFAR detection, hybrid-CFAR detection and simplified censored CFAR detection. Knowledge about the type of local environment of a Cell Under Test and the proximity of the Cell Under Test to various types of noise can be used to select particular types of CFAR detection methods or combinations thereof. In other instances, certain parameters of a CFAR detection method can be adapted based on this knowledge.
    Type: Grant
    Filed: November 12, 2012
    Date of Patent: October 13, 2015
    Assignee: Raytheon Canada Limited
    Inventors: Jian Wang, Anthony M. Ponsford, Emily Wang
  • Patent number: 9151834
    Abstract: A network resource can be operatively coupled to personal electronic devices that include or are operatively coupled to micro-impulse radars (MIRs).
    Type: Grant
    Filed: April 29, 2011
    Date of Patent: October 6, 2015
    Assignee: The Invention Science Fund I, LLC
    Inventors: Roderick A. Hyde, Jordin T. Kare, Lowell L. Wood, Jr.
  • Patent number: 9030351
    Abstract: A land-based Smart-Sensor System and several system architectures for detection, tracking, and classification of people and vehicles automatically and in real time for border, property, and facility security surveillance is described. The preferred embodiment of the proposed Smart-Sensor System is comprised of (1) a low-cost, non-coherent radar, whose function is to detect and track people, singly or in groups, and various means of transportation, which may include vehicles, animals, or aircraft, singly or in groups, and cue (2) an optical sensor such as a long-wave infrared (LWIR) sensor, whose function is to classify the identified targets and produce movie clips for operator validation and use, and (3) an IBM CELL supercomputer to process the collected data in real-time. The Smart Sensor System can be implemented in a tower-based or a mobile-based, or combination system architecture. The radar can also be operated as a stand-alone system.
    Type: Grant
    Filed: December 10, 2012
    Date of Patent: May 12, 2015
    Assignee: Vista Research, Inc.
    Inventors: Phillip A. Fox, Joseph W. Maresca, Jr.
  • Patent number: 8976059
    Abstract: In one aspect, a method to identify and remove a false detection includes receiving a detection from a constant false alarm rate (CFAR) processor, performing a first similarity measure on adjacent coherent integration time values (CITs) corresponding to the detection, performing a second similarity measure on neighbor CITs corresponding to the detection, determining if at least one of the first or second similarity measure is below a threshold and discarding the detection if at least one of the first or second similarity measures is below the threshold.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: March 10, 2015
    Assignee: Raytheon Canada Limited
    Inventors: Reza M. Dizaji, Anthony M. Ponsford, Richard McKerracher, Emily Wang
  • Publication number: 20140375491
    Abstract: An embodiment relates to a method for processing radar signals. The radar signals may include digitized data received by at least two radar antennas. The method may include determining CFAR results on FFT results based on data received by a first antenna, and applying the CFAR results to FFT results based on data received by a second antenna.
    Type: Application
    Filed: June 20, 2013
    Publication date: December 25, 2014
    Inventors: Andre' ROGER, Romain YGNACE
  • Patent number: 8823579
    Abstract: There is provided a sensor for use generally within the signal processing unit of a radar system. The sensor enables entity returns to be classified according to the velocity of the entity and thus allows returns to be processed according to classification. In particular, the sensor comprises a first processing means that filters an input signal using a narrow-band notch filter to output a wideband output. In particular, the sensor comprises a second processing means that filters an input signal using a wide-band notch filter to output a narrowband output. The invention provides for the comparison of the outputs to determine how the entity return is to be classified.
    Type: Grant
    Filed: March 9, 2010
    Date of Patent: September 2, 2014
    Assignee: BAE Systems PLC
    Inventor: Philip Trevelyan Edwards
  • Publication number: 20140176361
    Abstract: In one aspect, a method to identify and remove a false detection includes receiving a detection from a constant false alarm rate (CFAR) processor, performing a first similarity measure on adjacent coherent integration time values (CITs) corresponding to the detection, performing a second similarity measure on neighbor CITs corresponding to the detection, determining if at least one of the first or second similarity measure is below a threshold and discarding the detection if at least one of the first or second similarity measures is below the threshold.
    Type: Application
    Filed: December 21, 2012
    Publication date: June 26, 2014
    Applicant: Raytheon Canada Limited
    Inventors: Reza M. Dizaji, Anthony M. Ponsford, Richard McKerracher, Emily Wang
  • Patent number: 8717228
    Abstract: This disclosure provides a method of detecting a target object by receiving reflection echoes of detection signals transmitted sequentially from a revolving antenna, and by detecting a target object based on detection data resulted from sampling reception signals at a predetermined time interval. The method comprises temporarily storing the detection data within a predetermined geographical range, and identifying the type of the reflection echo based on a change between values of the detection data at physically-close locations within the predetermined geographical range.
    Type: Grant
    Filed: October 20, 2011
    Date of Patent: May 6, 2014
    Assignee: Furuno Electric Company Limited
    Inventor: Koji Nishiyama
  • Patent number: 8717224
    Abstract: An embodiment of the present invention discloses a radar apparatus and an antenna apparatus, and more particularly, an integrated radar apparatus and an integrated antenna apparatus which make it possible to attain angle resolution with high definition, to decrease size and the number of devices, to integrate long and mid-range radar function and short range radar function.
    Type: Grant
    Filed: January 4, 2011
    Date of Patent: May 6, 2014
    Assignee: Mando Corporation
    Inventor: Seong Hee Jeong
  • Publication number: 20140028488
    Abstract: Described are radar systems and methods. A transmit pulse is generated by the radar system. A first portion of the transmit pulse is processed by the radar system to form transmit pulse data. A second portion of the transmit pulse is directed by the radar system into a monitored volume. A return signal is received by the radar system, the return signal at least partially comprising a portion of the second portion of the transmit pulse reflected by one or more objects in the monitored volume. The return signal is processed, by the radar system, to form return signal data.
    Type: Application
    Filed: March 15, 2013
    Publication date: January 30, 2014
    Applicant: LAUFER WIND GROUP LLC
    Inventors: Hamilton Morris Stewart, Eric David Laufer
  • Publication number: 20130342382
    Abstract: A target object detection device is provided. The device includes a transmitter for transmitting at least one transmission wave in a predetermined azimuth, an echo signal receiver for receiving echo signals of the transmission waves, an echo signal suppressor for suppressing levels of the echo signals corresponding to sampling positions, a target object detector for detecting the target object(s) based on the level-suppressed echo signals, a first updater for comparing amplitude level(s) of echo signals of sampling positions, with the threshold that is set in association with the first distance, and determining to update the values with a new threshold and a new suppression value, and a second updater for comparing amplitude level(s) of echo signals of sampling positions, with the threshold that is set in association with the second distance, and determining to update the values with a new threshold and a new suppression value.
    Type: Application
    Filed: June 20, 2013
    Publication date: December 26, 2013
    Inventor: Hitoshi Maeno
  • Patent number: 8604969
    Abstract: A sensor is used to identify detections of discrete objects in a search grid. An image grid of the detections is created. The image grid is analyzed to identify a pattern of detections. The pattern of detections is used to identify objects of interest.
    Type: Grant
    Filed: April 5, 2010
    Date of Patent: December 10, 2013
    Assignee: Raytheon Company
    Inventors: Thomas E. Wood, Douglas W. Arent, Charles M. Ciany, Clifford M Curtis, Thomas B. Pederson
  • Patent number: 8570213
    Abstract: This disclosure provides a fake image reduction device, which includes a target object detection module for being inputted with an echo signal from an antenna that transmits an electromagnetic wave and receives the echo signal, measuring a level of the echo signal to detect a target object, a reflecting body identifying module for identifying the detected target object as a reflecting body, and a fake image area setting module for setting a fake image area according to a distance and an azimuth direction from a transmitting position of the electromagnetic wave to the identified reflecting body.
    Type: Grant
    Filed: November 8, 2010
    Date of Patent: October 29, 2013
    Assignee: Furuno Electric Company Limited
    Inventor: Koji Nishiyama
  • Patent number: 8564474
    Abstract: This disclosure provides a method of setting a threshold according to a level of an echo signal of an unused component. The echo signals are generated by transmitting and receiving a radio wave with an antenna while the antenna revolves. The method of setting the threshold includes calculating a difference value between a level of the echo signal at an observing position and a level of the echo signal at a position comparatively on the antenna side and close to the observing position, selecting a process for setting a threshold from either one of a first threshold setting process and a second threshold setting process according to the difference value, and updating the threshold for the observing position by using the selected threshold setting processing.
    Type: Grant
    Filed: July 5, 2011
    Date of Patent: October 22, 2013
    Assignee: Furuno Electric Company Limited
    Inventor: Hitoshi Maeno
  • Publication number: 20130201054
    Abstract: Various embodiments are described herein for a detector and method that perform various types of CFAR detection on radar data including knowledge-aided CFAR detection, hybrid-CFAR detection and simplified censored CFAR detection. Knowledge about the type of local environment of a Cell Under Test and the proximity of the Cell Under Test to various types of noise can be used to select particular types of CFAR detection methods or combinations thereof. In other instances, certain parameters of a CFAR detection method can be adapted based on this knowledge.
    Type: Application
    Filed: November 12, 2012
    Publication date: August 8, 2013
    Applicant: RAYTHEON CANADA LIMITED
    Inventor: Raytheon Canada Limited
  • Patent number: 8502731
    Abstract: A system and method of detecting moving targets comprises transmitting electromagnetic waves rays from a plurality of transmitters at sequential; receiving reflected waves into a plurality of receivers after each transmission; the compilation of the reflected waves from the plurality of receivers for each transmission representing a data frame; forming a signal that monitors changes between the two sets of frames; at least one processor operating to process and compare frames; forming a difference image using a back-projection algorithm; scanning the difference image using a constant false alarm rate (CFAR) window; the CFAR window scanning the entire difference image and identifying a list of points of interest and eliminating the sidelobe artifacts present in the difference image thereby creating CFAR images; processing the CFAR images using morphological processing to create a morphological image; determining the number of clusters present in the morphological image; using K-means clustering to indicate the
    Type: Grant
    Filed: January 18, 2011
    Date of Patent: August 6, 2013
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Anthony Frank Martone, Kenneth Irving Ranney
  • Publication number: 20130033394
    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: Application
    Filed: August 5, 2011
    Publication date: February 7, 2013
    Inventor: Brent McCleary
  • Patent number: 8339306
    Abstract: A detection system includes a detection processor configured to receive a frame of image data that includes a range/Doppler matrix, perform a rate-of-change of variance calculation with respect to at least one pixel in the frame of image data, and compare the calculated rate-of-change of variance with a predetermined threshold to provide output data. The range/Doppler matrix may include N down-range samples and M cross-range samples. The detection processor may calculate a rate-of-change of variance over an N×M window within the range/Doppler matrix.
    Type: Grant
    Filed: November 2, 2011
    Date of Patent: December 25, 2012
    Assignee: Raytheon Company
    Inventors: Donald P. Bruyere, Ivan S. Ashcraft, John B. Treece
  • Patent number: 8330647
    Abstract: A land-based smart sensor system and several system architectures for detection, tracking, and classification of people and vehicles automatically and in real time for border, property, and facility security surveillance is described. The preferred embodiment of the proposed smart sensor system is comprised of (1) a low-cost, non-coherent radar, whose function is to detect and track people, singly or in groups, and various means of transportation, which may include vehicles, animals, or aircraft, singly or in groups, and cue (2) an optical sensor such as a long-wave infrared (LWIR) sensor, whose function is to classify the identified targets and produce movie clips for operator validation and use, and (3) a supercomputer to process the collected data in real-time. The smart sensor system can be implemented in a tower-based or a mobile-based, or combination system architecture. The radar can also be operated as a stand-alone system.
    Type: Grant
    Filed: June 8, 2007
    Date of Patent: December 11, 2012
    Assignee: Vista Research, Inc.
    Inventors: Phillilp A. Fox, Joseph W. Maresca, Jr.
  • Patent number: 8310392
    Abstract: A radar device includes an antenna, from which a detection signal is transmitted while the antenna being rotated and by which a reflective wave of the transmitted detection signal is received to detect echo data, wherein image data is generated based on the detected echo data, a continuity detecting module for detecting a planar continuity of the currently detected echo data with respect to a pixel concerned in the image data, a behavior data generating module for generating behavior data indicative of a behavior of the echo data for a predetermined number of scans of the past in the pixel concerned based on behavior determination data, and an echo kind determining module for determining a kind of the echo data of the pixel concerned based on the planar continuity and the behavior data.
    Type: Grant
    Filed: February 26, 2010
    Date of Patent: November 13, 2012
    Assignee: Furuno Electric Company, Limited
    Inventors: Tatsuya Kojima, Takumi Fujikawa, Hidetoshi Kaida, Yu Morita, Toshiaki Takaki, Katsunori Okamatu
  • Patent number: 8259000
    Abstract: The present invention relates to a detecting device for detecting an SSR signal having a characteristic structure. The detecting device comprises filtering means matched to the characteristic structure of the SSR signal, and means for maintaining a false-alarm rate at a substantially constant value. The characteristic structure of the SSR signal comprises either a preamble or an initial pulse and a final pulse separated by a fixed dwell time. The means for maintaining a false-alarm rate at a substantially constant value comprise computing means configured to compute a detection threshold on the basis of a signal supplied by the filtering means, and decision means configured to detect the SSR signal on the basis of the detection threshold and of the signal supplied by the filtering means.
    Type: Grant
    Filed: September 3, 2008
    Date of Patent: September 4, 2012
    Assignee: Selex Sistemi Integrati S.p.A.
    Inventors: Fabrizio Fiori, Gaspare Galati, Stefano Gelli, Emilio Giuseppe Piracci
  • Publication number: 20120182173
    Abstract: A system and method of detecting moving targets comprises transmitting electromagnetic waves rays from a plurality of transmitters at sequential; receiving reflected waves into a plurality of receivers after each transmission; the compilation of the reflected waves from the plurality of receivers for each transmission representing a data frame; forming a signal that monitors changes between the two sets of frames; at least one processor operating to process and compare frames; forming a difference image using a back-projection algorithm; scanning the difference image using a constant false alarm rate (CFAR) window; the CFAR window scanning the entire difference image and identifying a list of points of interest and eliminating the sidelobe artifacts present in the difference image thereby creating CFAR images; processing the CFAR images using morphological processing to create a morphological image; determining the number of clusters present in the morphological image; using K-means clustering to indicate the
    Type: Application
    Filed: January 18, 2011
    Publication date: July 19, 2012
    Applicant: U.S. Government as represented by the Secretary of the Army
    Inventors: Anthony F. Martone, Kenneth I. Ranney
  • Publication number: 20120182171
    Abstract: A system and method for locating a moving target behind a wall or barrier comprising: providing a plurality of images of the region of interest; selecting a reference image from the plurality of images; forming a predetermined number of difference images by subtracting the absolute value of the pixels of the reference image from the absolute values of pixels in a predetermined number of the plurality of images; eliminating negative pixel values in the predetermined number of difference images; minimizing the side lobes to form a combined difference image for each reference frame, selecting another reference image from the plurality of images and performing the steps of forming a plurality of difference images, eliminating negative pixel values, averaging the resulting predetermined number of difference images and minimizing the side lobes for each selected reference image to form a set of combined difference images which contain the moving target signature.
    Type: Application
    Filed: September 15, 2011
    Publication date: July 19, 2012
    Applicant: U.S. Government as represented by the Secretary of the Army
    Inventors: Anthony F. Martone, Kenneth I. Ranney, Calvin Duc Le
  • Patent number: 8212717
    Abstract: A detection system and method. The inventive system includes an arrangement for receiving a frame of image data; an arrangement for performing a variance calculation with respect to at least one pixel in the frame of image data; and an arrangement for comparing the calculated variance with a predetermined threshold to provide output data. In the illustrative embodiment, the frame of image data includes a range/Doppler matrix of N down range samples and M cross range samples. In this embodiment, the arrangement for performing a variance calculation includes an arrangement for calculating a variance over an N×M window within the range/Doppler matrix. The arrangement for performing a variance calculation includes an arrangement for identifying a change in a standard deviation of a small, localized sampling of cells. In accordance with the invention, the arrangement for performing a variance calculation outputs a variance pixel map.
    Type: Grant
    Filed: October 18, 2007
    Date of Patent: July 3, 2012
    Assignee: Raytheon Company
    Inventors: Donald P. Bruyere, Ivan S. Ashcraft, John B. Treece
  • Patent number: 8188910
    Abstract: The invention relates to the general field of the detection, notably the radar detection, of mobile or fixed targets. It consists of a method making it possible mainly to qualify the blips supplied by the processing subsystem of the detection system before the latter are analyzed to generate tracks, each track being assumed to represent the trajectory of a moving object that has been detected. According to the invention, an analysis duration is considered, and all of the blips detected during this period are considered. These blips are divided up into subsets, each subset corresponding to the blips that, during the analysis duration, have been detected in one and the same analysis channel defined by an initial position and a speed vector. The subsets formed in this way are then grouped together, one and the same group combining the subsets comprising blips for which the combined assertion of a plurality of attributes is verified.
    Type: Grant
    Filed: December 1, 2009
    Date of Patent: May 29, 2012
    Assignee: Thales
    Inventors: Philippe Reuillon, Albert Groenenboom, Michel Moruzzis
  • Publication number: 20120127019
    Abstract: This disclosure provides a method of detecting a target object by receiving reflection echoes of detection signals transmitted sequentially from a revolving antenna, and by detecting a target object based on detection data resulted from sampling reception signals at a predetermined time interval. The method comprises temporarily storing the detection data within a predetermined geographical range, and identifying the type of the reflection echo based on a change between values of the detection data at physically-close locations within the predetermined geographical range.
    Type: Application
    Filed: October 20, 2011
    Publication date: May 24, 2012
    Inventor: Koji NISHIYAMA
  • Patent number: 8125374
    Abstract: Described herein is a method of preventing false detections in sensors pulse-Doppler radar mounted on a moving platform. The method comprises filtering each received burst using Doppler filtering to split each received burst into at least a fast channel and one or more slow channels. The slow channel outputs are then used to derive compensation values for the fast channel. In particular, a zero Doppler slow channel is used to derive predicted surface clutter residue information, and a near zero Doppler slow channel is used to derive additional false alarm control attenuation information. Both the predicted surface clutter residue and the false alarm control attenuation information is used to apply compensation to the fast channel and a comparison is done to select the lower of the two values to generate an output signal.
    Type: Grant
    Filed: August 5, 2008
    Date of Patent: February 28, 2012
    Assignee: BAE Systems PLC
    Inventor: Philip Trevelyan Edwards
  • Patent number: 8112039
    Abstract: A system and method for providing radar signal detection in a communications system. In an example method, a raw energy detect signal is received and analyzed to determine if the raw energy detect signal contains a valid radar pulse. A bit is stored in a bit sequence storage device such that the bit has a first value if a valid radar pulse was detected or a second value indicating that a valid pulse was not detected. A set of bits in the bit sequence storage device are accessed to determine if a plurality of waveform-indicating locations in the bit sequence storage device includes valid pulses. In another aspect of the invention, a system detects a radar signal in a communications device. The system includes a pulse detector to detect pulses in a raw energy signal having a pulse width within a predetermined minimum and maximum pulse width. The system includes a frequency detector having a bit sequence storage device to store the bits output by the pulse detector.
    Type: Grant
    Filed: December 11, 2007
    Date of Patent: February 7, 2012
    Assignee: Xirrus, Inc.
    Inventor: Drew Bertagna
  • Patent number: 8094060
    Abstract: A method for processing returns from a sensor, such as a radar system, in order to identify targets is provided. The method uses a track before detect routine to integrate data from several scans in order to give better discrimination. In running the track before detect routine however a number of possible target motions are postulated and the data combined accounting for such motions. A result above a threshold may then be indicative to a target present and moving with the postulated velocity. The method gives more accurate target detection as the combined data at the correct target motion postulate is more consistent than transient noise and clutter. Once a target has been identified it is preferably removed from the data set in searching for additional targets.
    Type: Grant
    Filed: January 29, 2004
    Date of Patent: January 10, 2012
    Assignee: Qinetiq Limited
    Inventors: Gavin Spencer Beard, Robert Michael Horey, Richard Oliver Lane, Samantha Jane Lycett
  • Publication number: 20120001790
    Abstract: There is provided a sensor for use generally within the signal processing unit of a radar system. The sensor enables entity returns to be classified according to the velocity of the entity and thus allows returns to be processed according to classification. In particular the sensor comprises a first processing means that filters an input signal using a narrow-band notch filter to output a wideband output. In particular the sensor comprises a second processing means that filters an input signal using a wide-band notch filter to output a narrowband output. The invention provides for the comparison of the outputs to determine how the entity return is to be classified.
    Type: Application
    Filed: March 9, 2010
    Publication date: January 5, 2012
    Applicant: BAE SYSTEMS PLC
    Inventor: Philip Trevelyan Edwards
  • Patent number: 8054217
    Abstract: A detection system and method. The inventive system includes an arrangement for receiving a frame of image data; an arrangement for performing a rate of change of variance calculation with respect to at least one pixel in said frame of image data; and an arrangement for comparing said calculated rate of change of variance with a predetermined threshold to provide output data. In the illustrative embodiment, the frame of image data includes a range/Doppler matrix of N down range samples and M cross range samples. In this embodiment, the arrangement for performing a rate of change of variance calculation includes an arrangement for calculating a rate of change of variance over an N×M window within the range/Doppler matrix. The arrangement for performing a rate of change of variance calculation includes an arrangement for identifying a change in a standard deviation of a small, localized sampling of cells.
    Type: Grant
    Filed: October 18, 2007
    Date of Patent: November 8, 2011
    Assignee: Raytheon Company
    Inventors: Donald P. Bruyere, Ivan S. Ashcraft, John B. Treece
  • Publication number: 20110241930
    Abstract: A sensor is used to identify detections of discrete objects in a search grid. An image grid of the detections is created. The image grid is analyzed to identify a pattern of detections. The pattern of detections is used to identify objects of interest.
    Type: Application
    Filed: April 5, 2010
    Publication date: October 6, 2011
    Applicant: Raytheon Company
    Inventors: Thomas E. Wood, Douglas W. Arent, Charles M. Ciany, Clifford M. Curtis, Thomas B. Pederson
  • Patent number: 8026841
    Abstract: Disclosed is a method, means for and computer program for enhancing range and azimuth resolution in a two-dimensional (2D) image generated by a frequency modulated continuous-wave (FMCW) radar for providing enhanced situational awareness in autonomous approach and landing guidance (AALG) system by forming and displaying a two-dimensional (2D) model of landing conditions from received range and azimuth real beam radar (RBR) signals by rendering one or more target locations and amplitudes in both range and azimuth, selecting a region of interest from the displayed 2D model to enhance the one or more target locations in the selected region of interest, selectively applying range and azimuth resolution enhancement using a first and second beamforming approach or applying azimuth only resolution enhancement by using just the second beamforming approach to obtain an one or more accurate target location estimations and combining the enhanced one or more target locations to render an enhanced 2D image.
    Type: Grant
    Filed: September 18, 2008
    Date of Patent: September 27, 2011
    Assignee: BAE SYSTEMS Controls Inc.
    Inventors: Guoqing Liu, Ken Yang
  • Patent number: 8013781
    Abstract: In a radar system using a radar clutter map comprising a plurality of range-azimuth cells containing parameter data values indicative of time averaged echo returns for affecting alarm threshold levels at range-azimuth locations scanned by the radar system antenna, a method for detecting comprising the steps of obtaining from the radar clutter map a first parameter data value associated with a given cell under test (CUT); determining a second parameter data value using parameter data values of other cells from the plurality of range-azimuth cells from the radar clutter map; comparing the first parameter data value associated with the CUT with the second parameter data value; and generating a signal indicative of a target detection when the first parameter data value exceeds the second parameter data value by a given threshold corresponding to a target false alarm rate.
    Type: Grant
    Filed: September 24, 2008
    Date of Patent: September 6, 2011
    Assignee: Lockheed Martin Corporation
    Inventor: Peter H. Stockmann
  • Patent number: 7990309
    Abstract: A method of analyzing return signals of successive range cells in a scene using constant false alarm rate adaptive control comprising, for each successive range cell in turn is disclosed mathematically. The return signal is processed mathematically and averaged over a predetermined number of cells near that cell. A first variable factor and the return signal for that cell, to derive a first result. The first variable is adapted depending upon that first result. A second variable factor is derived in accordance with a predetermined relationship between the first and second factors are mathematically processed. The second factor is mathematically processed. The second averaged return signal and the return signal for the cell, to derive a second result. The second result is used as an indication of the presence of an object of interest in the scene.
    Type: Grant
    Filed: June 5, 2008
    Date of Patent: August 2, 2011
    Assignee: Thales Holdings UK PLC
    Inventor: Simon Watts