Patents by Inventor Stephane Kemkemian

Stephane Kemkemian has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20240201322
    Abstract: The invention relates to a target characterisation method for a detection device of multi-panel radar or sonar type with electronic scanning, comprising the steps of: generating a plurality of pulses on a plurality of antenna panels (PE1, PE2, PE3) of the detection device according to a temporal and angular interleaving pattern, so as to perform a scan over all of the relative bearing domain of the detection device; generating a plurality of detection maps, by the acquisition of a plurality of observations combined with one another by coherent or non-coherent integration of the echoes corresponding to the plurality of pulses, each detection map being obtained in a given direction (EL1, EL2, EL3) corresponding to the width of the main lobe of the antenna panel; combining the detection maps so as to detect a presence of a target in the relative bearing domain of the detection device.
    Type: Application
    Filed: December 15, 2023
    Publication date: June 20, 2024
    Inventors: Adrien GILLIOT, Vincent CORRETJA, Stephane KEMKEMIAN, Nicolas LEGER
  • Patent number: 9664778
    Abstract: A radar and method for making a radar undetectable, comprising comprises: on a transmit antenna consisting of N individual subarrays that are non-directional in at least one plane in transmission, each being linked to a waveform generator, generating, for each of the individual subarrays, a waveform so as to make each of the individual subarrays transmit continuous or quasi-continuous signals according to a temporal and periodic pattern by using transmission patterns made up of N different subarrays and which are deduced from one another by an individual delay, on the receive antenna comprising M individual subarrays adapted to pick up the reflected signals obtained from the transmission of the N individual subarrays of the transmit antenna, performing a compression of the received signal in space and in time of the received signals.
    Type: Grant
    Filed: February 28, 2013
    Date of Patent: May 30, 2017
    Assignee: THALES
    Inventors: Pascal Cornic, Stephane Kemkemian, Jean-Paul Artis
  • Patent number: 9513366
    Abstract: A method for detecting targets using a mobile radar having a rotary antenna, notably small targets buried in radar clutter, without increasing the number of false detections, includes determining pre-detections during N antenna revolutions, including determining pre-detections revolution by revolution, each pre-detection being stored in a grid of cells centered on the position that the radar occupied at the start of the current revolution, each grid cell corresponding to an azimuth range and a distance range. This step also includes, at the end of each revolution, a step of shifting all the pre-detections stored in the grid during the previous revolutions by the movement undergone by the radar during the last revolution. The method also includes determining detections, a target being detected from the moment that a set of pre-detections stored in the grid has its distances to the radar which constitute a linear progression during the N antenna revolutions.
    Type: Grant
    Filed: April 5, 2012
    Date of Patent: December 6, 2016
    Assignee: Thales
    Inventors: Jean-Michel Quellec, Stephane Kemkemian, Xavier Mayeux
  • Patent number: 9488720
    Abstract: An active and passive detection device is provided with a low probability of interception having a fixed antenna structure, transmission means and reception means. The antenna structure is formed by a plurality of radiating elements grouped into identical subnetworks and comprises at least one transmission subnetwork and at least three reception subnetworks. The transmission means are capable of generating an unfocused continuous waveform having low peak power in one plane and of transmitting said waveform. The reception means are capable of detecting the targets following the formation of a plurality of directional beams on the basis of the signals received on the reception subnetworks. The reception means are likewise capable of implementing the interception of radar signals from other radar sources using cross correlation processing between the signals received on at least three reception subnetworks.
    Type: Grant
    Filed: March 26, 2013
    Date of Patent: November 8, 2016
    Assignee: THALES
    Inventors: Pascal Cornic, Patrick Le Bihan, Stephane Kemkemian
  • Publication number: 20150061928
    Abstract: A radar and method for making a radar undetectable, comprising comprises: on a transmit antenna consisting of N individual subarrays that are non-directional in at least one plane in transmission, each being linked to a waveform generator, generating, for each of the individual subarrays, a waveform so as to make each of the individual subarrays transmit continuous or quasi-continuous signals according to a temporal and periodic pattern by using transmission patterns made up of N different subarrays and which are deduced from one another by an individual delay, on the receive antenna comprising M individual subarrays adapted to pick up the reflected signals obtained from the transmission of the N individual subarrays of the transmit antenna, performing a compression of the received signal in space and in time of the received signals.
    Type: Application
    Filed: February 28, 2013
    Publication date: March 5, 2015
    Applicant: THALES
    Inventors: Pascal Cornic, Stephane Kemkemian, Jean-Paul Artis
  • Patent number: 8786487
    Abstract: A radar includes a transmitting antenna and receiving antenna formed by an array of radiant elements. Antenna beams are calculated in P directions by a BFC function. Detections of a target by secondary lobes of the beams are processed by an algorithm comparing levels received in a distance-speed resolution cell, a single detection at most not being possible for each distance-speed resolution cell. Processing means use the assumption that there may probably be more than one echo with a signal-to-noise ratio that is sufficient to be detectable, for a given resolution cell of the radar, either in speed mode or in distance mode, or, alternatively, a distance-speed depending on the processing implemented; and, if there is more than one echo detectable for each resolution cell out of the plurality of beams formed by BFC, only the echo and BFC that obtain maximum power or maximum signal-to-noise ratio are/is considered valid.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: July 22, 2014
    Assignee: Thales
    Inventors: Stephane Kemkemian, Pascal Cornic, Patrick Garrec, Patrick Le Bihan, Myriam Nouvel-Fiani
  • Publication number: 20140043185
    Abstract: A method for detecting targets using a mobile radar having a rotary antenna, notably small targets buried in radar clutter, without increasing the number of false detections, includes determining pre-detections during N antenna revolutions, including determining pre-detections revolution by revolution, each pre-detection being stored in a grid of cells centered on the position that the radar occupied at the start of the current revolution, each grid cell corresponding to an azimuth range and a distance range. This step also includes, at the end of each revolution, a step of shifting all the pre-detections stored in the grid during the previous revolutions by the movement undergone by the radar during the last revolution. The method also includes determining detections, a target being detected from the moment that a set of pre-detections stored in the grid has its distances to the radar which constitute a linear progression during the N antenna revolutions.
    Type: Application
    Filed: April 5, 2012
    Publication date: February 13, 2014
    Applicant: THALES
    Inventors: Jean-Michel Quellec, Stephane Kemkemian, Xavier Mayeux
  • Publication number: 20120081247
    Abstract: A radar includes a transmitting antenna and receiving antenna formed by an array of radiant elements. Antenna beams are calculated in P directions by a BFC function. Detections of a target by secondary lobes of the beams are processed by an algorithm comparing levels received in a distance-speed resolution cell, a single detection at most not being possible for each distance-speed resolution cell. Processing means use the assumption that there may probably be more than one echo with a signal-to-noise ratio that is sufficient to be detectable, for a given resolution cell of the radar, either in speed mode or in distance mode, or, alternatively, a distance-speed depending on the processing implemented; and, if there is more than one echo detectable for each resolution cell out of the plurality of beams formed by BFC, only the echo and BFC that obtain maximum power or maximum signal-to-noise ratio are/is considered valid.
    Type: Application
    Filed: September 28, 2011
    Publication date: April 5, 2012
    Applicant: THALES
    Inventors: Stephane KEMKEMIAN, Pascal CORNIC, Patrick GARREC, Patrick LE BIHAN, Myriam NOUVEL-FIANI
  • Patent number: 8120523
    Abstract: The present invention relates to a method of eliminating ground echoes for a meteorological radar. The ground echoes being received from a predetermined area by a radar, the radar illuminating, for a predetermined number R of transmission recurrences, the area over a number P of distance cells, the method includes a step for calculating a spatial statistical parameter of the cluttered echoes received by the radar in response to the recurrences over an analysis path for distance cells, and a step to compare the spatial variation level of the spatial statistical parameter along the analysis path, the echoes being considered to be ground echoes when the level of said variation is greater than a predetermined threshold.
    Type: Grant
    Filed: May 28, 2009
    Date of Patent: February 21, 2012
    Assignee: Thales
    Inventors: Stephane Kemkemian, Stephane Guguen, Christian Chaure
  • Patent number: 7924211
    Abstract: Detecting reflectors of an emitted electromagnetic pulse, using a received signal, by time-sampling the received signal and the emitted pulse at a same sampling frequency, each received sample corresponding to a return-trip distance for the emitted pulse between its transmitter and a possible reflector. The sampled received signal is divided by the emitted pulse sampled and temporally translated into an interval of duration equal to the emitted pulse divided into L samples, producing L results of the division. A weighted summing of the L results of the division is calculated, the sets of L weights each having a support on which the weights are not zero, every subinterval of length between L/n and L being the support for at least one set of weights and no support having a length of less than L/n, wherein the sums of the weights of a set all being equal, and n is a nonzero integer such that L/n is greater than or equal to 2.
    Type: Grant
    Filed: May 14, 2007
    Date of Patent: April 12, 2011
    Assignee: Thales
    Inventors: Luc Bosser, Stephane Kemkemian, Myriam Nouvel
  • Patent number: 7864110
    Abstract: The invention relates to a method for beam formation by calculation. For each defective active module of rank ip, the missing samples of the microwave signal a(îp) are calculated by one or more non-adaptive interpolations using the samples coming from the active modules in nominal operating mode situated in the neighborhood of the defective active modules, the beam being formed as if the interpolated samples a(îp) were the real measurements. In particular, the invention is applicable to the compensation for the effects of failures of one or more active modules distributed over an antenna of a radar with electronic scanning. The method according to the invention can notably be implemented within an airborne weather radar.
    Type: Grant
    Filed: May 24, 2006
    Date of Patent: January 4, 2011
    Assignee: Thales
    Inventors: Stephane Kemkemian, Jean-Paul Artis
  • Publication number: 20100188283
    Abstract: The present invention relates to a method for characterizing an atmospheric turbulence by representative parameters measured by a radar. The emission beam of the radar carried by an aircraft scanning the zone of the turbulence, a measured parameter being the total variance of the velocity of the turbulence ?U, this total variance at a point x0 inside the turbulence is the sum of the spatial variance of the spectral moment of order 1 of the signals received by the radar Var[M1({right arrow over (x)})] and of the spatial mean of the spectral moment of order 2 of the signals received Mean[M2({right arrow over (x)})], the moments being distributed as a vector {right arrow over (x)} sweeping an atmospheric domain around the point x0. The invention applies notably in respect of meteorological radars fitted to aircraft such as airliners for example.
    Type: Application
    Filed: June 13, 2008
    Publication date: July 29, 2010
    Applicant: Thales
    Inventors: Stephane Kemkemian, Helene Thuilliez, Myriam Nouvel
  • Publication number: 20100176984
    Abstract: The present invention relates to a method of eliminating ground echoes for a meteorological radar. The ground echoes being received from a predetermined area by a radar, the radar illuminating, for a predetermined number R of transmission recurrences, the area over a number P of distance cells, the method includes a step for calculating a spatial statistical parameter of the cluttered echoes received by the radar in response to the recurrences over an analysis path for distance cells, and a step to compare the spatial variation level of the spatial statistical parameter along the analysis path, the echoes being considered to be ground echoes when the level of said variation is greater than a predetermined threshold.
    Type: Application
    Filed: May 28, 2009
    Publication date: July 15, 2010
    Applicant: Thales
    Inventors: Stephane Kemkemian, Stephane Guguen, Christian Chaure
  • Publication number: 20090278729
    Abstract: Detecting reflectors of an emitted electromagnetic pulse, using a received signal, by time-sampling the received signal and the emitted pulse at a same sampling frequency, each received sample corresponding to a return-trip distance for the emitted pulse between its transmitter and a possible reflector. The sampled received signal is divided by the emitted pulse sampled and temporally translated into an interval of duration equal to the emitted pulse divided into L samples, producing L results of the division. A weighted summing of the L results of the division is calculated, the sets of L weights each having a support on which the weights are not zero, every subinterval of length between L/n and L being the support for at least one set of weights and no support having a length of less than L/n, wherein the sums of the weights of a set all being equal, and n is a nonzero integer such that L/n is greater than or equal to 2.
    Type: Application
    Filed: May 14, 2007
    Publication date: November 12, 2009
    Applicant: Thales
    Inventors: Luc Bosser, Stephane Kemkemian, Myriam Nouvel
  • Publication number: 20080291082
    Abstract: An aim of the invention is to allow the detection of turbulence in the absence of tracers. A radar is embedded aboard an aircraft (21) and implements the following steps: searching for the upper part of a convective system (1) situated outside the given zone, reflecting the electromagnetic waves; searching for divergence zone (7) inside the convective system by searching for a divergence profile; reckoning the appearance of turbulence in the given zone as a function of observable meteorological phenomena in the divergence zone (7) by applying fluid mechanics properties.
    Type: Application
    Filed: April 25, 2008
    Publication date: November 27, 2008
    Applicant: THALES
    Inventor: Stephane Kemkemian
  • Publication number: 20080180323
    Abstract: The invention relates to a method for beam formation by calculation. For each defective active module of rank ip, the missing samples of the microwave signal a(îp) are calculated by one or more non-adaptive interpolations using the samples coming from the active modules in nominal operating mode situated in the neighborhood of the defective active modules, the beam being formed as if the interpolated samples a(îp) were the real measurements. In particular, the invention is applicable to the compensation for the effects of failures of one or more active modules distributed over an antenna of a radar with electronic scanning. The method according to the invention can notably be implemented within an airborne weather radar.
    Type: Application
    Filed: May 24, 2006
    Publication date: July 31, 2008
    Applicant: Thales
    Inventors: Stephane Kemkemian, Jean-Paul Artis
  • Patent number: 5963163
    Abstract: In a method and device for frequency-modulated continuous-wave radar detection with removal of ambiguity between the distance and the speed, the radar sends out at least alternately two parallel and discontinuous frequency modulation ramps that are slightly offset by a frequency variation (.DELTA.F), the frequency switching from one ramp to the other at the end of a given duration (Tf), the distance from a detected target being estimated as a function of the difference in phase (.DELTA..phi.) between a received signal (S.sub.1 (t)) corresponding to the first ramp and a received signal (S.sub.2 (t)) corresponding to the second ramp, the speed of the target being obtained from the estimated distance and the ambiguity straight line associated with the target. The disclosed method and device can be applied especially to radars for automobiles.
    Type: Grant
    Filed: February 25, 1998
    Date of Patent: October 5, 1999
    Assignee: Thomson-CSF
    Inventors: Stephane Kemkemian, Philippe Lacomme
  • Patent number: 5955985
    Abstract: Disclosed is a device for the reduction of noise in a radar receiver. The noise to be reduced being governed by a 1/F.sup.k relationship and the radar carrying out an encoding of the transmission in at least two frequencies, the device comprises at least the following means: firstly, means for routing the signals received to at least two channels so that, when a target is illuminated by a transmission at the first code frequency (F.sub.1), the corresponding received signal (S.sub.1) is sampled and routed to a first channel and then, when the target is illuminated by the second code frequency (F.sub.2), the corresponding received signal (S.sub.2) is sampled and routed to a second channel; and secondly, means for the linear combination of the signal (S.sub.1) present in the first channel and the signal (S.sub.2) present in the second channel, the linear combination synthesizing a filtering of the noise.
    Type: Grant
    Filed: February 24, 1998
    Date of Patent: September 21, 1999
    Assignee: Thomson-CSF
    Inventors: Stephane Kemkemian, Philippe Lacomme