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.

Abstract: A system and method of radar location comprises radar signal emission means, an emitted pulse of duration T1 and index i starting at instant T2(i); means receiving reflected radar signals; means determining correlation between reconstruction of an emitted pulse and signal received during the time interval between T2(i)+2*T1 and T2(i+1). The means determining a correlation can reconstruct a set, of at least one truncated pulse j of duration T3(j), less than T1, 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 T2(i)+T1 and T2(i)+T1+T3(j) and determining a second signal, based on first correlated signals j, by copying the time interval, of said correlated signal j, between T2(i)+T1+T3(j) and T2(i)+T1+T3(j+1), onto the time interval, of said second signal, between T2(i)+T1+T3(j) and T2(i)+T1+T3(j+1).

Abstract: A method for controlling laws of illumination of a radar antenna with adjustable gain and/or phase, suitable for sending and for receiving a radar signal, the method including obtaining a position of an obstacle located in a near field of a beam of the radar antenna according to a direction of aim of said beam, calculating the laws of illumination on sending and on receiving of said radar antenna so as to adjust the direction of the aim of the radar beam while minimizing interaction and/or effects between the beam of the radar antenna and the obstacle, and implementing the calculated laws of illumination on sending and on receiving of the radar antenna.

Abstract: A radar emission-reception method including a step of cyclic emission of a group of pulses of different frequency, each frequency being emitted on a different channel and each cycle comprises a single emission phase and a single listening phase and a reception step during which the echoes of each emitted pulse are processed simultaneously and in parallel in different reception frequency channels. Also, a radar making it possible to implement the emission-reception method.

Abstract: A method of estimating the angular position ?c 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 ?(i) of the antenna; estimating, for each pulse or group of pulses of time index i, the Doppler frequency fD(i) of the echo or echoes received; pairing, for each pulse or group of pulses of time index i, the angular position ?(i) and the Doppler frequency fD(i); and, estimating the angular position ?c at least by solving the equation ? ? ? f D ? ( i ) 2 = V a ? sin ? ? ? ? ( i ) ? ( ? c - ? ? ( i ) ) + V r , c , where ? is the wavelength of the radar, Va is the norm of the speed of the carrier and Vr,c is the radial speed of the target.

Abstract: A system and method for scanning through a 360° 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;i. The radar system includes the radar antenna with the two elementary electronic scanning antennas and an aiming computer.

Abstract: 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: Z = MAX t ∈ D t , f ∈ D f ⁢ ( ∑

Abstract: The disclosure pertains to methods of fast exploration in azimuth by a surveillance radar antenna and to radars implementing such methods. The method consists in driving, at slow speed, an antenna comprising two elementary electronic scanning antennas installed back to back, simultaneously controlling the electronic aiming of each elementary electronic scanning antenna, switching over the microwave signal sent alternatively between the two elementary electronic scanning antennas and, before each rotation of the radar beam, initializing the electronic aiming of each elementary electronic scanning antenna at a determined angle &thgr;i. The radar comprises an antenna with two elementary electronic scanning antennas and an aiming computer. Application especially to a sea patrol radar.