Thales

Nicolas Bon

Jean-Paul Artis

Stéphane Kemkemian

Jean-Michel Quellec

Clémentine Costes

Maxence Marcant

Henri Sauvageot

Alain Becker

Olivier Pujol

Frédéric Mesnard

Gabriel Marchalot

Nicolas Raguenes

Jean-Baptiste Genin

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 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 method for processing signals of an airborne radar includes a correction of the erroneous angle of pointing of the radar beam, comprising an evaluation of the error in the pointing angle for a constant height of the aerial transporter. For a given angle of scan, the method carries out at least two series of measurements of the power of the echoes returned following the emission of radar signals, each series being associated with a given distance-bin, the measurements being dependent on the angle of pointing of the radar antenna, formulates a vertical profile of the power of the echoes returned for each series of measurements, and then on the basis of each vertical profile, measures the pointing angle corresponding to a power of the echoes returned by the ground alone, and calculates the error in the pointing angle on the basis of the measured pointing angles.

Method for processing signals of an airborne radar with correction of the error in the radar beam pointing angle and corresponding device

The invention targets a method of processing a radar image obtained from a radar. It comprises an automatic evaluation of the altitude of the isotherm at zero degrees Celsius, called zero isotherm, using a processing of the reflectivity information (rf(px)) conveyed by pixels (px) forming all or part of the radar image.

Method of processing a radar image, obtained in particular from an airborne radar, with evaluation of the altitude of the 0&#xb0; C. isotherm

The method processes measured vertical profiles of the power of the echoes returned following a transmission of radar signals, each measured vertical profile being a function of the sweep angle of the radar beam and associated with a given pointing angle/distance box pair of the radar beam. The method generates a synthetic vertical profile of the power of the echoes returned by the ground only, and includes, for each measured vertical profile: superposition of the synthetic vertical profile on the measured vertical profile in question, for various values of the sweep angle, calculation of the error that exists between the measured vertical profile and the synthetic vertical profile, for each sweep angle value in question, and an exclusion, from the measured vertical profile, of the values for which the calculated error is less than a given threshold, in order to generate a resultant vertical profile with no ground echoes.

Method for processing measured vertical profiles of the power of the echoes returned following a transmission of radar signals

The present invention relates to a method of characterizing the convection intensity of a cloud by a meteorological radar. The reflectivity of said cloud to an electromagnetic wave being distributed in space, the distribution of the reflectivity being discretized according to a network of points (i, j, k) of the space in three dimensions, at least one profile () is defined as a normalized function of a parameter (), which is in turn a given numeric function in two dimensions (i, j) of the distribution of the reflectivity at each point of the network, said normalized function varying uniformly between a minimum constant value and a maximum constant value, the function being equal to the minimum value when the parameter is less than a low threshold (threshold min) and being equal to the maximum value when the parameter is greater than a high threshold (threshold max), the cloud being characterized as convective when the profile is equal to one of the constant values and as stratiform when it is equal to the other constant value. The invention applies notably to meteorological radars on board aeroplanes.

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Brest, France

Nicolas Bon