Abstract: A method for automatic control of false alarms in a detection list corresponding to an output of a detection processing operating on a radar signal delivered by a maritime observation radar includes a tracking process enabling the identification of detections in the detection list likely corresponding to a spike, the tracking process being a hierarchical tracking process consisting, at the lowest level, of tracking spikes, and, at the highest level, of tracking groups of spikes, the tracking of spikes at the lowest level being performed conditionally at the highest level based on a common parameter characteristic of each spikes group track.

Abstract: A method for observing an environment includes the implementation of several recurrences of a signal emission and reception step, at least one sequence of recurrences including, for N and M two integers: N first recurrences comprising the emission of pulses in a first direction at a first frequency and the reception of echoes emitted following this emission; M recurrences comprising the emission of pulses in a second direction at a second frequency; and N second recurrences comprising the emission of pulses at a repetition period in the second direction at the second frequency, and the reception of echoes emitted following this emission.

Abstract: An operating method for a radar includes a signal emission/receipt step including the following sub-steps: generation of two consecutive pulses associated with a first and a second Doppler sub-mode; emission of pulses in different frequency bands; receipt of pulse echoes in a common time window; preprocessing of received echoes in relation to the first Doppler sub-mode to determine a clutter zone; and preprocessing of received echoes in relation to the second Doppler sub-mode outside the clutter zone. The method further includes the step of implementation of an extraction processing from a preprocessing result of received echoes in relation to the second Doppler sub-mode.

Abstract: A method of operation for a target detection radar, including determining a plurality of active tracks in a visibility cone, each active track showing a target to pursue, for each active track, determining a waveform allowing its detection and tracking, determining compatibility of active tracks by comparing the determined waveforms for these tracks to form at least one set of compatible active tracks, and for the or each set of compatible active tracks, emitting/receiving a communal wave including consecutive pulses, each pulse being associated with one of the active tracks of the set.

Abstract: The present invention relates to a method of operating a target detection radar in a mode of maritime surveillance. The method includes determining a level of false alarms in each geographical sector, implementing several recurrences of a signal emission/reception operation, for each geographical sector, of a type chosen from simple waves and communal waves, based on the level of false alarms determined for at least one of the geographical sectors. Each communal wave includes at least two consecutive pulses associated with different emission directions and/or different frequencies, and emitted in different frequency bands. Each simple wave includes a single pulse.

Abstract: A method for operating a target-detection radar following a first radar mode and a second radar mode corresponding to Doppler modes, the method including the implementation of several recurrences of a signal emission/reception operation, each N-th recurrence of said operation including the following sub-operations: generation of two consecutive pulses associated with different radar modes and different emission directions, emission of the pulses in different frequency bands, the pulses associated with different radar modes are emitted using different polarizations, and reception in a common time window of the echoes of the pulses.

Abstract: A method of operating a target detection radar following a first mode of operation and at least one second mode of operation, the first mode of operation being a synthetic aperture radar imaging mode and each second mode of operation being different from the first mode of operation, the method including the implementation of several recurrences of a signal emission/reception operation, wherein, for each N, the Nth recurrence of the operation including the following sub-operations: generation of a sequence of consecutive pulses, each pulse of the sequence being associated with a respective mode of operation, emission of the pulses in different frequency bands, and reception of the pulse echoes in a common time window, during the sub-operation of emission, at least one of the pulses, called the out of phase pulse, being emitted with a random phase associated with the number N.

Abstract: A method for operating a target-detection radar following a first radar mode and a second radar mode corresponding to Doppler modes, the method including the implementation of several recurrences of a signal emission/reception operation, each N-th recurrence of the operation including the following sub-operations: generation of two consecutive pulses associated with different radar modes and different emission directions, emission of the pulses in different frequency bands, and reception in a common time window of the echoes of the pulses.

Abstract: A method for creating a virtual reception channel in a radar system includes an antenna possessing two physical reception channels (1r, 2r) spaced apart by a distance d in a direction x, two emission channels (1e, 2e) spaced apart by the same distance d in the same direction x and processing means, the method comprising: dynamically selecting two different waveforms, the waveforms being orthogonal to each other; generating a radar pulse of given central wavelength in each emission channel, each of the emission channels emitting one of the two different waveforms; acquiring with the reception channels echoes due to pulses emitted by the emission channels and reflected by at least one target; compressing the pulses by matched filtering of the echoes acquired by each physical reception channel, this involving correlating them with each of the waveforms generated in the emission channel; and repeating steps a) to c) while randomly changing one of the values of each of the phase codes associated with the generated

Abstract: The echoes being picked up in the distance-speed domain, the method being wherein it includes a step of producing a mask, in the distance-speed plane, overlying the zone of detection of the ground and/or sea clutter echoes picked up by the sidelobes, the zone being determinable by the antenna parameters of the radar, the waveform emitted by the radar and the environmental context of the radar, all the points of the distance-speed plane which are covered by the mask being assigned a characteristic which is specific to the mask; a step of filtering the received echoes, in which the echoes covered by the mask are rejected from the radar reception processing.

Abstract: A method for creating a virtual reception channel in a radar system includes an antenna possessing two physical reception channels (1r, 2r) spaced apart by a distance d in a direction x, two emission channels (1e, 2e) spaced apart by the same distance d in the same direction x and processing means, the method comprising: dynamically selecting two different waveforms, the waveforms being orthogonal to each other; generating a radar pulse of given central wavelength in each emission channel, each of the emission channels emitting one of the two different waveforms; acquiring with the reception channels echoes due to pulses emitted by the emission channels and reflected by at least one target; compressing the pulses by matched filtering of the echoes acquired by each physical reception channel, this involving correlating them with each of the waveforms generated in the emission channel; and repeating steps a) to c) while randomly changing one of the values of each of the phase codes associated with the generated

Abstract: The echoes being picked up in the distance-speed domain, the method being wherein it includes a step of producing a mask, in the distance-speed plane, overlying the zone of detection of the ground and/or sea clutter echoes picked up by the sidelobes, the zone being determinable by the antenna parameters of the radar, the waveform emitted by the radar and the environmental context of the radar, all the points of the distance-speed plane which are covered by the mask being assigned a characteristic which is specific to the mask; a step of filtering the received echoes, in which the echoes covered by the mask are rejected from the radar reception processing.

Abstract: Methods and devices for detecting, in a scene, a first type reflector is provided. The method includes identifying, using a radar in a mobile system, a zone of a distance-radial velocity space that contains a second type reflector. The second type reflector is capable of concealing the first type reflector. The method includes modeling an order two phase shift over time of theoretical first type and second type reflectors. The method includes creating a filter a distance and a radial velocity. The method includes illuminating the scene. The method includes acquiring raw radar data from the echoes reflected by the reflectors of the scene. The method includes obtaining distance profiles. The method includes applying a filter on the distance profiles. The method includes detecting the first type reflector among the second type reflector.

Abstract: A millimeter and/or submillimeter network vector analyzer comprises a millimeter source and a millimeter heterodyne receiver, and the network to be analyzed is placed between the source and the receiver. The millimeter source comprises a first microwave source feeding a millimeter harmonic generator. The millimeter heterodyne receiver comprises a millimeter harmonic mixer which is fed by a second microwave source which serves as a local oscillator for it, an HF (high frequency) vector receiver and a device for displaying the characteristics of the analyzed network. The analyzer includes a device for servocontrolling the frequency of emission of the second microwave source by the frequency of the first microwave source (or conversely), and a main HF (high frequency) oscillator activating this servocontrol device. The main oscillator is also directly used as a phase reference for the HF (high frequency) vector receiver.