With Correlation Or Matched Filtering Patents (Class 367/100)
  • Patent number: 10785074
    Abstract: A synchronizer generates cross-products of In-phase (I) and Quadrature (Q) samples and stores the sign bits for the sine and cosine cross-products. The sign bits are compared to a local reference of a frame-start bit-sequence and the compare results accumulated as I and Q correlations for symbol and half-symbol sampling. Linear combinations of the accumulated I and Q correlations for the symbol and half-symbol sampling generate linear combination results for frequency bins that peak at a different implied Carrier Frequency Offset (CFO) settings. The maximum of the linear combination results is selected and the implied CFO setting for that frequency bin is applied to a demodulator to adjust the receiver's CFO setting and bit synchronization. Computational complexity is reduced since only the sign bit of each cross-product is retained for correlation with the frame-start bit-sequence. Linear combinations can support a wide CFO range.
    Type: Grant
    Filed: April 29, 2020
    Date of Patent: September 22, 2020
    Assignee: Hong Kong Applied Science and Technology Research Institute Company, Limited
    Inventors: Jianhui Wang, Tao Li
  • Patent number: 10746863
    Abstract: To acquire a beat frequency necessary for target extraction, target speed estimation, and Doppler influence detection by preventing the necessary beat frequency from overlapping unnecessary frequencies in a heterodyne processing result, an apparatus includes a wave receiver that receives a reflected wave of a chirp wave reflected from a target, and outputs a reception wave signal, a dual-sweep signal generator that generates a dual-sweep signal of the chirp wave, having a frequency which does not overlap that of the chirp wave, and a heterodyne processor that generates a beat frequency by multiplying the reception wave signal and the dual-sweep signal as a heterodyne signal.
    Type: Grant
    Filed: December 26, 2014
    Date of Patent: August 18, 2020
    Assignee: NEC Corporation
    Inventor: Osamu Hoshuyama
  • Patent number: 10620292
    Abstract: A signal evaluation system is provided for evaluating a first EM signal and a second EM signal for use in a passive coherent location system. The signal evaluation system includes: a spectrum detecting component that detects the first EM signal and the second EM signal; a signal characterization component that generates a first characterization of the first EM signal and to generate a second characterization of the second EM signal; and a ranking component that ranks the EM signals for use in the passive coherent location system. The first characterization is based on an amplitude associated with the first EM signal and one of range resolution, Doppler resolution, and combinations thereof associated with the first EM signal. The second characterization is based on an amplitude associated with the second EM signal and one of range resolution, Doppler resolution, and combinations thereof associated with the second EM signal.
    Type: Grant
    Filed: September 6, 2017
    Date of Patent: April 14, 2020
    Assignee: United States of America as represented by Secretary of the Navy
    Inventors: Nicholas T. Johnson, Mohammed Chergui, John D. Rockway, Oren Sternberg
  • Patent number: 10576931
    Abstract: A sensor-controlled key system for a motor vehicle for releasing an access authorization and for actuating auxiliary functions includes a control device having an electronic key device. The key system further includes at least one optical sensor device with at least one optical sensor element. The optical sensor element has a beam path that defines at least two observation regions B1, B2, Bn. The control device has a switching function that switches observation regions B1, B2, Bn on and off in dependence on a verified or non-verified access authorization.
    Type: Grant
    Filed: September 18, 2018
    Date of Patent: March 3, 2020
    Assignee: Dr. Ing. h.c. F. Porsche Aktiengesellschaft
    Inventor: Christoph Rausch
  • Patent number: 10338253
    Abstract: Artefacts arising from imperfect extrapolation of a data set subjected to filtering operation are removed by forming a model of the extrapolated data, performing a filtering process on the model and the data set to form a filtered model and a filtered data set, and adaptively subtracting the filtered model from the filtered data set. The adaptive subtraction may employ a least-square error filter.
    Type: Grant
    Filed: December 4, 2014
    Date of Patent: July 2, 2019
    Assignee: PGS Geophysical AS
    Inventors: Martijn Frijlink, Rob Hegge, Rolf Baardman
  • Patent number: 10061009
    Abstract: A system and method is described for generating a confidence level for data generated by a beamforming acoustic beacon system. The system may include an audio emission device to emit a set of sounds corresponding to a set of predefined modal patterns into a listening area. The sounds may be detected by an audio capture device to produce a set of impulse responses corresponding to the modal patterns. The impulse responses may be processed to produce a set of window synthesized impulse responses for various angles. These window synthesized impulse responses may (1) be formed based on a weighted set of the modal patterns that were originally used to emanate sound and (2) seek to emulate a target beam, which is also composed of the same weighted modal patterns. A confidence level may be computed based on the difference between the window synthesized impulse responses and the target beam pattern.
    Type: Grant
    Filed: September 28, 2015
    Date of Patent: August 28, 2018
    Assignee: Apple Inc.
    Inventors: Afrooz Family, Martin E. Johnson
  • Patent number: 10018714
    Abstract: A radar system for detecting a target containing electronic components. The radar system includes a radiofrequency transmitter which generates a radar signal at a fundamental frequency. A modulator modulates the radar signal at a modulation frequency and the modulated radar signal is coupled to a transmission antenna. A receiver receives an echo from the radar signal. A filter isolates the harmonics of the fundamental frequency from the echo and a demodulator then compares the phase of the harmonics of the echo with the phase of the harmonics of the radar signal and generates an output signal representative thereof. An imaging algorithm receives the output signal and creates a two-dimensional image of the received echo and then displays that image on a display.
    Type: Grant
    Filed: June 24, 2015
    Date of Patent: July 10, 2018
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: DaHan Liao
  • Patent number: 9755720
    Abstract: Apparatus is provided for: storing at least one three-dimensional matrix C[M][N][K] of calibration data; performing singular value decomposition of each at least one three-dimensional matrix C[M][N][K] of calibration data to produce at least one first unitary rotation matrix U, at least one diagonal scaling matrix S and at least one second unitary rotation matrix V; and resizing each of the at least one first unitary rotation matrix U, the at least one diagonal scaling matrix S and the at least one second unitary rotation matrix V by removing dimensions therefrom, thereby producing resized matrices U, S and V. Corresponding decompression is also provided.
    Type: Grant
    Filed: May 31, 2013
    Date of Patent: September 5, 2017
    Assignee: Nokia Technologies Oy
    Inventor: Xianjun Jiao
  • Patent number: 9702768
    Abstract: An acoustic signal traversing a hot gas is sampled at a source and a receiver and is represented in overlapping windows that maximize useable signal content. Samples in each window are processed to represented in different sparsified bins in the frequency domain. Determining a signal delay between the source and the receiver from a summation of maximum smoothed coherence transform cross-correlation values of different data windows wherein a sparseness of a mean smoothed coherence transform cross-correlation of windows is maximized. Determining a set of delay times wherein outliers are deleted to estimate a time of flight from which a temperature of the hot gas is calculated.
    Type: Grant
    Filed: August 7, 2013
    Date of Patent: July 11, 2017
    Assignee: Siemens Corporation
    Inventors: Heiko Claussen, Justinian Rosca, Michelle Xiaohong Yan, Upul P. DeSilva, Nancy H. Ulerich
  • Patent number: 9665784
    Abstract: Spoof-detection and liveness analysis is performed using a software-based solution on a user device, such as a smartphone having a camera, audio output component (e.g., earpiece), and audio input component (e.g., microphone). One or more audio signals are emitted from the audio output component of the user device, reflect off a target, and are received back at the audio input component of the device. Based on the reflections, a determination is made as to whether the target is comprised of a three-dimensional face-like structure and/or face-like tissue. Using at least this determination, a finding is made as to whether the target is likely to be spoofed, rather than a legitimate, live person.
    Type: Grant
    Filed: May 31, 2016
    Date of Patent: May 30, 2017
    Assignee: EyeVerify Inc.
    Inventors: Reza R. Derakhshani, Joel Teply
  • Patent number: 9465126
    Abstract: The present invention relates to an apparatus for use in geophysical surveying. Geophysical surveying typically involves stimulating an area of interest with a seismic source (204) and detecting the response in a sensor array. The application describes a fiber optic distributed sensing apparatus having a source (112) of electromagnetic radiation for repeatedly launching interrogating electromagnetic radiation into an optic fiber (104) deployed in said of area interest, a sampling detector (116) for sampling radiation back-scattered from the fiber; and a processor (108) arranged to process the back-scattered radiation to provide, for each of a plurality of longitudinal sensing portions of optic fiber, an indication of any incident acoustic signals affecting that sensing portion. The sampling detector is arranged to acquire a plurality of diversity samples for each said longitudinal sensing portion.
    Type: Grant
    Filed: July 12, 2012
    Date of Patent: October 11, 2016
    Assignee: OPTASENSE HOLDINGS LIMITED
    Inventors: Andrew Lewis, Stuart Russell
  • Patent number: 9405726
    Abstract: A method for calculating intermodulation noise generated with one or more land seismic sources. The method includes receiving seismic data generated by actuating the one or more land seismic source with a first sweep and a second sweep; calculating with a computing device a first earth response corresponding to the first sweep; calculating with the computing device a second earth response corresponding to the second sweep; and calculating the intermodulation noise based on the first and second earth responses. The second sweep is a time reverse sweep of the first sweep.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: August 2, 2016
    Assignee: CGG SERVICES SA
    Inventors: John Sallas, Kaelig Castor
  • Patent number: 9348023
    Abstract: There is provided a radar apparatus configured to extract peak signals which are obtained from a difference frequency between a transmission signal and a reception signal, and to derive information of the target on the basis of the extracted peak signals. A prediction unit predicts this time peak signal based on a peak signal obtained in previous time. An extraction unit extracts this time peak signal corresponding to the predicted peak signal from peak signals existing within a predetermined frequency range. The extraction unit extends the frequency range when this time peak signal corresponding to the predicted peak signal does not exist within the predetermined frequency range.
    Type: Grant
    Filed: November 5, 2013
    Date of Patent: May 24, 2016
    Assignee: FUJITSU TEN LIMITED
    Inventors: Hisateru Asanuma, Hiroyuki Ishimori
  • Patent number: 9322916
    Abstract: An environment monitoring device in a motor vehicle having a signal generating device for generating a transmitted signal, at least one ultrasonic transducer for converting electric oscillations into acoustic oscillations and/or vice versa, and an evaluation device which evaluates an electric received signal in order to determine distances to objects in an environment of the motor vehicle, wherein the signal generating device is linked to the at least one ultrasonic transducer so that the ultrasonic transducer emits an ultrasonic transmitted signal into the environment in accordance with the electric transmitted signal, and the evaluation device is connected to the at least one ultrasonic transducer or at least one further ultrasonic transducer in order to receive the electric received signal. Also disclosed is a method for monitoring an environment by using a cross-correlation.
    Type: Grant
    Filed: April 30, 2012
    Date of Patent: April 26, 2016
    Assignee: VOLKSWAGEN AG
    Inventors: Claudia Prausse, Volkmar Tanneberger, Stephan Max
  • Patent number: 9322808
    Abstract: The present invention relates to a method of non-destructive inspection of mechanical structures (2) by using vibratory waves in order to detect local defects and/or changes of state. According to the invention, the method comprises: a first training stage in which a transient vibratory excitation is injected into an inspection zone (Z) and the received signals are picked up and time reversed in order to constitute reference excitation signals; a second training stage in which the reference excitation signals are emitted simultaneously and the resulting diverging signals are picked up in order to constitute reference response signals; and a stage of inspecting the mechanical structure (2), in which the reference excitation signals are emitted, the resulting diverging signals are picked up, and the diverging signals are compared with the reference response signals.
    Type: Grant
    Filed: July 3, 2012
    Date of Patent: April 26, 2016
    Assignee: 01DB-METRAVIB
    Inventors: Pascal Vouagner, Jean-Louis Guyader, Jacques Charvin
  • Patent number: 9255991
    Abstract: A method for acoustically sensing an area is described. An acoustic transmit pulse is transmitted into the area by an acoustic transducer and a received signal is acquired with the aid of the transducer, in order to receive the transmit pulse reflected back from the area. Within a post-pulse oscillation time of the transducer, which directly follows the emission of the transmit pulse, the actual phase response of the received signal is determined. In the event the actual phase response deviates from a predefined setpoint phase response, an object is detected within the area. Also described is a device for acoustically sensing an area, which is designed to carry out the method.
    Type: Grant
    Filed: December 2, 2011
    Date of Patent: February 9, 2016
    Assignee: ROBERT BOSCH GMBH
    Inventors: Micha Kalbhenn, Albrecht Klotz, Juergen Schirmer, Thomas Treptow, Dirk Schmid, Nico Bannow, Peter Rapps, Tobias Kirchner, Thomas Dittrich, Michael Schumann
  • Patent number: 8995226
    Abstract: There is provided a method and associated apparatus for measurement. Specifically, a method for determining a distance travelled by a signal in a medium, or the time of flight of a signal travelled. The method comprises considering an unambiguous range wherein the unambiguous range greater than a distance to be travelled by a signal. A signal is then transmitted across the distance to be determined, the signal comprising at least two frequency components, the frequency components based on the unambiguous range and the speed of the signal in the medium. The distance travelled (or the time of flight) is determined by using the variance of the received phase characteristics, such as phase angle) of one frequency component of the received signal with the received phase characteristics of another frequency component of the received signal.
    Type: Grant
    Filed: June 23, 2011
    Date of Patent: March 31, 2015
    Assignee: Bios Developments Limited
    Inventors: Laurie Linnett, Allison Mason
  • Patent number: 8982668
    Abstract: In an embodiment a semiconductor device correlates a received signal with a known pattern. A correlation output is used as a basis for forming a confidence reference level. The confidence reference level and the correlation output are compared to identify a peak in the received signal indicating that a present signal state of the received signal contains the known pattern.
    Type: Grant
    Filed: November 15, 2010
    Date of Patent: March 17, 2015
    Assignee: Semiconductor Components Industries, LLC
    Inventors: Pavel Horsky, Ivan Koudar, Tomas Suchy
  • Patent number: 8854921
    Abstract: A method for detecting an object within a surrounding area of a vehicle, includes: repeatedly transmitting wave pulses into the surrounding area; repeatedly receiving wave pulses, which correspond to the transmitted wave pulses reflected by the objects; detecting the object with the aid of a signal representation of the received wave pulses, and ascertaining at least one signal characteristic of a first received wave pulse. The detecting of the object includes: comparing the curve in the form of the signal characteristic of the first received wave pulse to the curve of a further received wave pulse, which was received after the first received wave pulse, location information of the object being corrected in light of the comparison.
    Type: Grant
    Filed: November 26, 2010
    Date of Patent: October 7, 2014
    Assignee: Robert Bosch GmbH
    Inventor: Matthias Karl
  • Patent number: 8804459
    Abstract: A method and apparatus for passive determination of target data (R, K, V) associated with a target from measured and estimated bearing angles. The measured bearing angles (4) are determined by a sonar receiving installation (2) by directionally selective reception of sound waves which are emitted or sent from a target, and the estimated bearing angles are determined from estimated positions of the target. The bearing angle differences from estimated and measured bearing angles are minimized iteratively over a plurality of processing cycles, and a position of the target, on which the minimum is based, is determined as the optimized solution (12). Furthermore, limit values (10) are defined for the target data (R, K, V) to be determined, in order to exclude unrealistic target data as solutions.
    Type: Grant
    Filed: June 16, 2011
    Date of Patent: August 12, 2014
    Assignee: Atlas Elektronik GmbH
    Inventor: Ulrich Steimel
  • Publication number: 20140208845
    Abstract: A system for measuring the height of bin contents includes transmitters for transmitting pulses of wave energy towards the upper surface of the contents and receivers for receiving echoes of the pulses and producing corresponding signals. The transmitters and receivers are distributed aerially above the contents. The system also includes a processing apparatus, for using the received signals to map the upper surface, that includes correlators that correlate pulse waveforms with the signals, and a beamformer. In one embodiment, the beamformer computes, from the signals considered as corresponding to echoes, of pulses from fewer synthetic transmitters, received at a synthetic receiver array, respective directions of arrival of the signals.
    Type: Application
    Filed: March 18, 2013
    Publication date: July 31, 2014
    Inventors: Yossi Zlotnick, Avishai Bartov
  • Publication number: 20140198620
    Abstract: An environment monitoring device in a motor vehicle having a signal generating device for generating a transmitted signal, at least one ultrasonic transducer for converting electric oscillations into acoustic oscillations and/or vice versa, and an evaluation device which evaluates an electric received signal in order to determine distances to objects in an environment of the motor vehicle, wherein the signal generating device is linked to the at least one ultrasonic transducer so that the ultrasonic transducer emits an ultrasonic transmitted signal into the environment in accordance with the electric transmitted signal, and the evaluation device is connected to the at least one ultrasonic transducer or at least one further ultrasonic transducer in order to receive the electric received signal. Also disclosed is a method for monitoring an environment by using a cross-correlation.
    Type: Application
    Filed: April 30, 2012
    Publication date: July 17, 2014
    Applicant: VOLKSWAGEN AG
    Inventors: Claudia Prausse, Volkmar Tanneberger, Stephan Max
  • Patent number: 8693286
    Abstract: A position measurement apparatus and methodology is provided. Embodiments include a probe including an acoustic signal source, an optical signal source, and a probe processor for driving the signal sources such that the signals of the acoustic source and the optical source have a known temporal relationship to each other. A receiver receives the optical and acoustic signals, and a processor communicates with and controls the probe and the receiver, and processes data from the receiver. The acoustic signal source is a sinusoidally varying acoustic energy source, and the acoustic signal received by the receiver comprises a sinusoidal signal. The processor correlates the received sinusoidal signal to a mathematical reference sinusoidal signal, and determines a specific cycle and a specific phase as a time of flight measurement point based on the correlation.
    Type: Grant
    Filed: October 18, 2010
    Date of Patent: April 8, 2014
    Assignee: Snap-On Incorporated
    Inventors: Steve W. Rogers, Darwin Y. Chen, Eric F. Bryan, Adam C. Brown
  • Patent number: 8687462
    Abstract: A method of obtaining information about the positions of sources in a marine seismic source array that has N seismic sources, including at least Nunique types of sources that are nominally non-identical to one another, where 1?Nunique?N?1. The method comprises measuring the pressure field at M independent locations of the N sources, where M>Nunique, and obtaining information about the positions of sources from the M pressure measurements and from the constraint that at least two of the sources are nominally identical to one another.
    Type: Grant
    Filed: May 12, 2009
    Date of Patent: April 1, 2014
    Assignee: WesternGeco L.L.C.
    Inventor: Jon-Fredrik Hopperstad
  • Patent number: 8654609
    Abstract: A target detection device includes: a sound source which projects a sound pulse; a transducer array disposed in a region for receiving a forward scattered wave from an object in the propagation environment; an addition processing unit which extracts only a signal of the forward scattered wave by applying vector addition processing on a reference signal in a reference sound field received when an obstacle exists in the propagation environment and a mixed signal in a mixed sound field received when the target exists with the obstacle; a phase conjugation determination unit which checks whether a phase conjugacy is established by receiving the signal of the extracted forward scattered wave and employing a passive phase conjugation for determining the reference sound field; and a time reversal processing unit which generates a time reversal signal on condition that the phase conjugation determination unit judges that the phase conjugacy is established.
    Type: Grant
    Filed: November 5, 2009
    Date of Patent: February 18, 2014
    Assignee: NEC Corporation
    Inventors: Yoshiaki Tsurugaya, Toshiaki Kikuchi
  • Patent number: 8620082
    Abstract: Systems and methods for sonar image feature extraction, which fit a parameterized statistical model to sonar image data to extract features that describe image textures for follow-on pattern classification tasks. The systems and methods estimate the parameters of an assumed statistical model from the pixel values in the sonar images. The parameters of the distribution can then be used as features in a discriminant classifier to perform tasks such as texture segmentation or environmental characterization. The systems and methods divide a sonar image into separate overlapping cells. The ACF parameters of each cell are sequentially estimated using various methods. Based on the ACF parameters obtained, each cell is assigned a label via a pattern classification algorithm. The labeled image can be used in target recognition, environmental characterization and texture segmentation.
    Type: Grant
    Filed: April 1, 2011
    Date of Patent: December 31, 2013
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: James T. Cobb, Gerald J. Dobeck
  • Patent number: 8593908
    Abstract: A method, which allows, in an acoustic pulse-echo ranging system, the direct use of a digitized raw echo signal for correlation-based echo distance estimation, where an acoustic pulse having a carrier frequency is transmitted, a digital expected echo shape is provided with a time resolution higher than the carrier frequency, an echo is received from the acoustic pulse, the received echo is sampled and digitized at a sampling frequency higher than the carrier frequency, correlation values are created from the digitized received echo and the digital expected echo shape, the correlation values are weighted by emphasizing stronger correlation values, and the echo distance is determined from the center of mass of the weighted values.
    Type: Grant
    Filed: August 25, 2011
    Date of Patent: November 26, 2013
    Assignee: Siemens Aktiengesellschaft
    Inventors: Edson Ferreira, Jean-René Larocque
  • Publication number: 20130301391
    Abstract: A system for small space positioning comprises a transmitting element at a fixed and known location, which transmitting a modulated continuous wave, for example an ultrasonic wave, having a continuous carrier signal part and a base-band signal modulated thereon. The transmitting element transmits the modulated continuous wave over a range in which an object to be positioned may appear. A receiving element receives signals transmitted by the transmitting device and reflected by the object, and a position detection element determines a position of the object from analysis of both the carrier signal part and the base-band signal received from the reflected signal.
    Type: Application
    Filed: November 16, 2011
    Publication date: November 14, 2013
    Applicant: QUALCOMM Incorporated
    Inventors: Nathan Altman, Yossef Tsfaty, Meir Agassy
  • Publication number: 20130279295
    Abstract: A dual frequency ultrasonic locationing system includes an emitter operable to emit two different ultrasonic frequencies simultaneously in one ultrasonic burst. A receiver with at least two microphones is operable to receive the ultrasonic burst. A correlator is operable to correlate the signals obtained from each microphone to derive a time difference of arrival of the ultrasonic burst at each microphone. The time difference of arrival of the ultrasonic signal from the emitter impinging on each microphone of the receiver is utilized to determine a location of the emitter.
    Type: Application
    Filed: April 20, 2012
    Publication date: October 24, 2013
    Applicant: Symbol Technologies, Inc.
    Inventors: Russell E. Calvarese, Richard J. Lavery
  • Patent number: 8547397
    Abstract: A method for processing data, in particular an image representative of an observation zone in which is situated an object arranged with respect to a reference plane.
    Type: Grant
    Filed: March 23, 2010
    Date of Patent: October 1, 2013
    Assignee: France Telecom
    Inventor: Olivier Gachignard
  • Patent number: 8437222
    Abstract: A system and method of range estimation are disclosed. In one embodiment, the method comprises transmitting beams through a medium towards a surface, receiving reflected signals from the surface, and estimating range to the surfaced based on the reflected signals and an estimate of sidelobe coupling of the beams.
    Type: Grant
    Filed: March 30, 2011
    Date of Patent: May 7, 2013
    Assignee: Teledyne RD Instruments, Inc.
    Inventor: Mark A. Vogt
  • Patent number: 8385676
    Abstract: Embodiments of the present invention are directed to various enhanced discrete-universal denoisers that have been developed to denoise images and other one-dimensional, two-dimensional or higher-dimensional data sets in which the frequency of occurrence of individual contexts may be too low to gather efficient statistical data or context-based symbol prediction. In these denoisers, image quality, signal-to-noise ratios, or other measures of the effectiveness of denoising that would be expected to increase monotonically over a series of iterations may decrease, due to assumptions underlying the discrete-universal-denoising method losing validity. Embodiments of the present invention apply context-class-based statistics and statistical analysis to determine, on a per-context-class basis, when to at least temporarily terminate denoising iterations on each conditioning class.
    Type: Grant
    Filed: July 30, 2009
    Date of Patent: February 26, 2013
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Marcelo Weinberger, Gadiel Seroussi, Erik Ordentlich
  • Publication number: 20130033964
    Abstract: A method for detecting an object within a surrounding area of a vehicle, includes: repeatedly transmitting wave pulses into the surrounding area; repeatedly receiving wave pulses, which correspond to the transmitted wave pulses reflected by the objects; detecting the object with the aid of a signal representation of the received wave pulses, and ascertaining at least one signal characteristic of a first received wave pulse. The detecting of the object includes: comparing the curve in the form of the signal characteristic of the first received wave pulse to the curve of a further received wave pulse, which was received after the first received wave pulse, location information of the object being corrected in light of the comparison.
    Type: Application
    Filed: November 26, 2010
    Publication date: February 7, 2013
    Inventor: Matthias Karl
  • Patent number: 8195425
    Abstract: Systems and methods for estimating the distance between a start point and a true endpoint in which at least two functions of differing resolutions are used. The method includes measuring a coarse distance between the start point and an intermediate point using the lower resolution function, the intermediate point comprising a point which is substantially within one unit of the higher resolution function away from the true endpoint. Next, a vernier distance is measured from the intermediate point to a vernier endpoint using the higher resolution function, the vernier endpoint being within a narrow, vernier error window of the true endpoint. Subsequently, the coarse and vernier distances are summed to obtain the estimated distance.
    Type: Grant
    Filed: November 23, 2004
    Date of Patent: June 5, 2012
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Shekhar Ramachandra Borgaonkar, Prasenjit Dey, Deepu Vijayasenan
  • Publication number: 20120113753
    Abstract: A position detection system, includes at least one moving body (MB) including a transmission device simultaneously emitting a trigger signal indicating transmission timing and an ultrasonic signal obtained by modulating a signal of a frequency as a reference by pseudo random sequence data having high self-correlativity, and a reception device detecting MB position. The reception device includes ultrasonic reception units, a unit calculating a correlation value between a waveform of the ultrasonic signal and a model waveform of the pseudo random sequence, a unit subjecting the waveform of the ultrasonic signal and the model waveform to calculate a correlation value between the two waveforms, a unit calculating a propagation time of each ultrasonic to arrive at each of the ultrasonic reception units from trigger signal reception to correlation peak detection, and a unit calculating MB position from the ultrasonic propagation time and the interval length between the ultrasonic reception units.
    Type: Application
    Filed: July 2, 2010
    Publication date: May 10, 2012
    Applicant: NEC CORPORATION
    Inventors: Junichi Miyamoto, Hiroshi Kajitani
  • Patent number: 8154438
    Abstract: The present invention can find the exact location anywhere in the nautical world (latitude/longitude coordinates) by correlating or matching radar returns with maps produced by a digital nautical chart called a Chart Server, because each pixel location on the Chart Server maps can be traced back to a latitude/longitude coordinate. An obstacle avoidance module called a Chart Server provides digital nautical charts to create a map of the world. To determine the current world location of a vehicle, the invention combines the Chart Server maps with a radar return, which also appears to display prominent features such as coastlines, buoys, piers and the like. These return features from the radar are correlated or matched with features found in the Chart Server maps. The radar then reports its current location inside of its local map, which when translated to the Chart Server map, correlates to a latitude/longitude registration location.
    Type: Grant
    Filed: September 8, 2009
    Date of Patent: April 10, 2012
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Jacoby Larson, Michael Bruch
  • Publication number: 20120051185
    Abstract: A method, which allows, in an acoustic pulse-echo ranging system, the direct use of a digitized raw echo signal for correlation-based echo distance estimation, where an acoustic pulse having a carrier frequency is transmitted, a digital expected echo shape is provided with a time resolution higher than the carrier frequency, an echo is received from the acoustic pulse, the received echo is sampled and digitized at a sampling frequency higher than the carrier frequency, correlation values are created from the digitized received echo and the digital expected echo shape, the correlation values are weighted by emphasizing stronger correlation values, and the echo distance is determined from the center of mass of the weighted values.
    Type: Application
    Filed: August 25, 2011
    Publication date: March 1, 2012
    Applicant: Siemens Aktiengesellschaft
    Inventors: Edson FERREIRA, Jean-René Larocque
  • Patent number: 8127138
    Abstract: The invention as disclosed is of a method to authenticate identify and trace sonar transmissions and echoes by embedding transparent, secure and robust digital watermarks in signal space, where the additional information incurs no cost in bandwidth. The complex short time Fourier transform is selected as the domain for embedding the digital watermark, secured by a secret key, in the time frequency representation of the signal. The watermark is designed through an iterative optimization step. This step insures that the watermarked sonar is also realizable. Selection of the time frequency region for watermarking is driven by avoidance of interference with the sonar itself, or in case of network operation, other watermarks. In addition, the selected time-frequency region remains robust to sound channel and other transmission effects. Sonar echoes are authenticated in the time-frequency plane by a correlation receiver tuned to the watermarked region using the secret key.
    Type: Grant
    Filed: September 29, 2008
    Date of Patent: February 28, 2012
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Robert S. Lynch, G. Clifford Carter, Bijan Mobasseri
  • Publication number: 20110280106
    Abstract: The ultrasonic sensor having a switchable receive filter has a first bandwidth for a near measuring range of the ultrasonic sensor, and a second bandwidth for a distant measuring range of the ultrasonic sensor, the first bandwidth being greater than the second bandwidth.
    Type: Application
    Filed: August 6, 2009
    Publication date: November 17, 2011
    Inventor: Martin Reiche
  • Publication number: 20110261653
    Abstract: An object probing device includes: a sound source which projects a sound pulse within a propagation environment; a transducer array disposed in a region for receiving the forward scattered wave scattered forward from the object existing in the propagation environment; an addition processing unit which extracts only a signal of the forward scattered wave by applying vector addition processing on a reference signal in a reference sound field received by the transducer array when the object does not exist in the propagation environment and a mixed signal in a probe sound field received when the object exists; a time reversal processing unit which generates a time-reversed sound pulse by applying time reversal processing on the extracted forward scattered wave; and a phase conjugation determination unit which checks whether or not a phase conjugacy is established in the propagation environment by employing a passive phase conjugation to the time-reversed sound pulse.
    Type: Application
    Filed: November 5, 2009
    Publication date: October 27, 2011
    Applicants: NEC CORPORATION
    Inventors: Yoshiaki Tsurugaya, Toshiaki Kikuchi
  • Publication number: 20110242939
    Abstract: An active sonar system, a method associated therewith, and a computer-readable medium associate therewith, each provide a method of sonar signal processing. The method includes receiving a plurality of initial detections of a target and associated initial detection times, associated with sound transmitted at a pulse rate interval (PRI), and associated with received sound including echoes from a target. The echoes result from the transmitted sound. The method also includes analyzing the plurality of initial detection times with a pulse sorting transform configured to identify periodic PST detection times within the plurality of initial detection times that are equally spaced in time and that are representative of the echoes from the target.
    Type: Application
    Filed: April 6, 2010
    Publication date: October 6, 2011
    Applicant: Raytheon Company
    Inventor: Thomas B. Pederson
  • Patent number: 7929375
    Abstract: The invention is a method for improved active sonar using a singular value decomposition filtering and a Volterra-Hermite Basis Expansion to model real active sonar measurements. The fitting model minimizes the sum of the squared errors between a measured channel response, z(t), and model response, y(t), which is a fitted Volterra Series solution. The model requires as input an excitation waveform, x(t), to which is fitted the model response, y(t). A contracted broadband cross-ambiguity function is used to correct the excitation waveform for Doppler and range effects. Once completed, the modeled response can be used to determine the linearity or non-linearity of the channel effects. Appropriate measures can be utilized to reduce these effects on the measured channel response.
    Type: Grant
    Filed: June 26, 2007
    Date of Patent: April 19, 2011
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Albert H. Nuttall, Richard A. Katz
  • Patent number: 7924653
    Abstract: A system and method of range estimation are disclosed. In one embodiment, the method comprises transmitting beams through a medium towards a surface, receiving reflected signals from the surface, and estimating range to the surfaced based on the reflected signals and an estimate of sidelobe coupling of the beams.
    Type: Grant
    Filed: August 13, 2008
    Date of Patent: April 12, 2011
    Assignee: Teledyne RD Instruments, Inc.
    Inventor: Mark A. Vogt
  • Patent number: 7876645
    Abstract: The present invention refers to a system for detecting obstacles for vehicles, comprising at least one sensor able to transmit a detection signal and to receive an echo signal reflected off at least one obstacle, means of parametric evaluation of said received echo signal which comprise means of comparison between at least two successive echo signals for the determination of a reference echo signal able to define the position of at least one fixed obstacle with respect to said at least one sensor.
    Type: Grant
    Filed: July 28, 2006
    Date of Patent: January 25, 2011
    Assignee: Meta System S.p.A.
    Inventor: Severino Bigliardi
  • Patent number: 7855674
    Abstract: The present invention provides a coherent radar system based on a modification of standard non-coherent radar without Moving Target Indication. Typical radars in this class are Navigation radars which are mass produced with low cost components. These radars utilize a magnetron in the transmitter which is a random phase device. In the present invention, the received signal is extracted just prior to amplitude detection process (where phase information is lost), and digitized using an analogue to digital converter providing coherent detection based on correlation between the transmitted pulse and the received signal.
    Type: Grant
    Filed: July 13, 2006
    Date of Patent: December 21, 2010
    Assignee: Telefonaktiebolaget L M Ericsson (Public)
    Inventor: Per Atle Våland
  • Patent number: 7852709
    Abstract: A sonar system and method of use capable of discriminating a direct acoustic signal present at 60 dB or more above the acoustic echo signal.
    Type: Grant
    Filed: December 21, 2007
    Date of Patent: December 14, 2010
    Assignee: General Dynamice Information Technology
    Inventors: Donald Lerro, Larry Freeman, John Green, David Ashworth
  • Publication number: 20100245386
    Abstract: A method for processing data, in particular an image representative of an observation zone in which is situated an object arranged with respect to a reference plane.
    Type: Application
    Filed: March 23, 2010
    Publication date: September 30, 2010
    Applicant: France Telecom
    Inventor: OLIVIER GACHIGNARD
  • Publication number: 20100149923
    Abstract: The present invention refers to a system for detecting obstacles for vehicles, comprising at least one sensor able to transmit a detection signal and to receive an echo signal reflected off at least one obstacle, means of parametric evaluation of said received echo signal which comprise means of comparison between at least two successive echo signals for the determination of a reference echo signal able to define the position of at least one fixed obstacle with respect to said at least one sensor.
    Type: Application
    Filed: July 28, 2006
    Publication date: June 17, 2010
    Inventor: Severino Bigliardi
  • Patent number: 7664165
    Abstract: Provided is a correlation apparatus based on symmetry of a correlation coefficient that can reduce complexity of hardware by reducing the number of adders and multipliers. Accordingly, when values of a real number part and an imaginary number part are exchanged with respect to a middle point of a correlation coefficient sequence and divided into two parts of left and right by the middle point of the correlation coefficient sequence, the values of the real number part and the imaginary number part are even-symmetrical with respect to the middle point of the divided two parts. Therefore, the number of the adders required for forming the correlation apparatus is reduced by at least 20% and the number of the multipliers is reduced by at least 70% in comparison with the 62 adders and the 64 multipliers required for a conventional correlation apparatus.
    Type: Grant
    Filed: November 21, 2005
    Date of Patent: February 16, 2010
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Hun-Sik Kang, Jung-Sik Kim, Do-Young Kim
  • Patent number: 7663975
    Abstract: An underwater detection apparatus for detecting a target by transmitting and receiving an ultrasound signal is provided. The apparatus includes a replica memory module for storing the typical amplitude evolution of a seawall echo during a predetermined time period as a template-replica beforehand, a correlator module for determining a correlation between the amplitude evolution of an echo signal reflected from the target and the template-replica, a seawall detector module for detecting a seawall position based on the correlation, and a seawall display processor module for displaying the seawall on its position in an indicator.
    Type: Grant
    Filed: March 26, 2008
    Date of Patent: February 16, 2010
    Assignee: Furuno Electric Company Limited
    Inventors: Jerome Dubuis, Hitoshi Maeno, Florian Girault