Thales

Thomson-csf

Jean-Michel Quellec

Jean-Paul Artis

Daniel Jahan

Daniel Christien

Pascal Cornic

Stéphane Kemkemian

Richard Montigny

Nicolas Bon

Gabriel Marchalot

Patrick Le Bihan

Myriam Chabah

Xavier Mayeux

Patrick Legros

The invention relates to a method for testing the electromagnetic compatibility of a radar detector with at least one onboard pulse signal transmitter, wherein said radar detector and each onboard transmitter are part of the same platform, by means of eliminating the external echo component in the signals received by the radar detector, said method comprising a training phase allowing the detected pulses to be divided into classes, grouping together the pulses for which at least two characteristics have a common range of values, and a phase of eliminating the pulses that belong to the selected classes.

Method for testing the electromagnetic compatibility of a radar detector with at least one onboard pulse signal transmitter

The invention relates to a method for testing the electromagnetic compatibility of a radar detector with at least one onboard pulse signal transmitter, wherein said radar detector and each onboard transmitter are part of the same platform, by means of eliminating the onboard component in the signals received by said radar detector, where the onboard component corresponds to the mix of the direct component and the reflected component onboard, said method comprising a training phase allowing the detected pulses to be divided into classes, grouping together the pulses for which at least two characteristics have a common range of values, and a phase of eliminating the pulses that belong to the selected classes.

The invention relates to a method for testing the electromagnetic compatibility of a radar detector with at least one onboard pulse signal transmitter, wherein said radar detector and each onboard transmitter are part of the same platform, by means of eliminating the onboard component in the signals received by said radar detector, where the onboard component corresponds to the mix of the direct component and the reflected component onboard, said method comprising a training phase allowing the detected pulses to be divided into classes, grouping together the pulses for which at least two characteristics have a common range of values, and a phase of eliminating, the pulses that belong to the selected classes.

The invention relates to a method for determining features of an electromagnetic wave received by a reception system (), the reception system () comprising at least two reception channels (), each reception channel () comprising an antenna () and a reception chain (), each reception chain () being capable of delivering a value representative of the power delivered by the corresponding antenna () after reception of the wave by the reception system (), the features comprising at least the direction of arrival of the received wave, the method comprising a step of providing a measurement vector,

Method for determining features of an electromagnetic wave

A method for jamming airborne SAR radar implemented by a jamming device includes at least two cooperating units surrounding an area on the ground to be protected, at least two units providing a radar-detection function and at least one unit providing a radar-jamming function, each unit being interlinked by a two-way data link and being synchronized by a common clock, the method comprises a step of identifying the signals received and whether the received signals correspond to SAR signals; a step of characterizing the received SAR signal over a short duration; a step of computing a filter adapted to the signal; a step of carrying out pulse compression of the signal; a step of iteratively periodically characterizing the signal over a long duration; a step of computing the jamming signals to be transmitted; a step of transmitting the jamming signals.

Method for jamming synthetic aperture radars and associated device

A method including providing a replica of a signal emitted by an on-board radar, receiving by a radar detector a signal, the received signal being the sum of a first signal depending on the signal emitted by the on-board radar and a second signal independent of the signal emitted by the on-board radar, the first signal being able to be represented by a linear combination of elementary signals each having an amplitude coefficient and a delay relative to the signal emitted by the on-board radar, processing the received signal, determining the amplitude coefficients and the delays of the elementary signals of the first signal relative to the signal emitted by the on-board radar, from the provided replica and the processed received signal, and eliminating, in the processed received signal, the first signal to obtain the second signal, from the provided replica.

Method for deleting a signal coming from an on-board radar

A detection method implementing an FMCW waveform is provided, the emitted waveform is formed of a recurring pattern of given period Tr covering an emission frequency band of given width B, each pattern being divided into a given number P of sub-patterns of duration Tr/P covering an excursion frequency band &#x394;F=B/P, the sub-patterns being mutually spaced by a frequency interval equal to &#x394;F. The radar performs: a first distance-compression processing operation carrying out a low-resolution distance compression at the scale of each recurring pattern on a fraction B/P of the emission band of width B corresponding to the frequency band covered by each of the sub-patterns; a Doppler processing operation on a given number N of successive recurrences so as to form P ambiguous distance-Doppler maps of low distance resolution, the maps being segmented into various speed domains; a second distance-compression processing operation of resolution that differs depending on the speed domain to which the relative speed of the target with respect to the radar belongs.

Multi-resolution FMCW radar detection method and radar implementing such a method

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.

Method for detecting, over several antenna revolutions, slow-moving targets buried in the radar clutter, using a mobile radar having a rotary antenna

A method of eliminating spurious echoes in SAR imaging comprises a step Etpof defining the SAR imaging parameters, a step Etpof calculating the spectrum of the signal received, in each distance bin, of a zone of interest, a step Etpof filtering the spectra in each distance bin, a step Etpof SAR imagetteformation and a step Etpof concatenating the SAR imagettesto form the final SAR image.

Method of eliminating spurious echoes in SAR imaging

A system and method of radar location comprises radar signal emission means, an emitted pulse of duration Tand index i starting at instant T(); means receiving reflected radar signals; means determining correlation between reconstruction of an emitted pulse and signal received during the time interval between T()+2*Tand T(i+1). The means determining a correlation can reconstruct a set, of at least one truncated pulse j of duration T(), less than T, corresponding to the final part of said emitted pulse, said truncated pulses having increasing respective durations, determining at least one first correlated signal j by correlation of said truncated pulse j and signal received during time interval between T()+Tand T()+T+T() and determining a second signal, based on first correlated signals j, by copying the time interval, of said correlated signal j, between T()+T+T() and T()+T+T(j+), onto the time interval, of said second signal, between T()+T+T() and T()+T+T(j+).

System and method of radar location

A method of estimating the angular position &#x3b8;of a target detected by a radar equipping a mobile carrier and emitting, via an steerable antenna, a signal, in the form of pulses, towards the target and receiving echoes from the reflection of said signal on the target, comprises: estimating, for each pulse or group of pulses of time index i, the angular position &#x3b8;(i) of the antenna; estimating, for each pulse or group of pulses of time index i, the Doppler frequency f(i) of the echo or echoes received; pairing, for each pulse or group of pulses of time index i, the angular position &#x3b8;(i) and the Doppler frequency f(i); and, estimating the angular position &#x3b8;at least by solving the equation where &#x3bb; is the wavelength of the radar, Vis the norm of the speed of the carrier and Vis the radial speed of the target.

Method for estimating the angular position of a target by radar detection and radar implementing said method

A system and method for scanning through a &deg; azimuth by a surveillance radar antenna. The method includes driving at slow speed the radar antenna including two electronic scanning antennas installed back to back, simultaneously controlling the electronic aiming of each of the two electronic scanning antenna, switching the microwave signal sent alternatively between the two electronic scanning antennas and, before each rotation of the radar beam, initializing the electronic aiming of each of the two elementary electronic scanning antenna at a determined angle &thgr; . The radar system includes the radar antenna with the two elementary electronic scanning antennas and an aiming computer.

Method of exploration in azimuth for a radar, and radar implementing the method

A method for the detection of a target by a radar in the presence of noise, the detection being performed on M antenna rotations, comprises at least: a first step for the estimation of the Doppler frequency ({circumflex over (f)}) of the target; a detection step, the target being detected if an associated variable Z is greater than or equal to a predetermined threshold S, the variable Z being defined according to the following relationship:

Growing community of inventors

Brest, France

Jean-Michel Quellec