METHOD FOR DETERMINING THE SPEED AND DIRECTION OF MOVEMENT OF GROUND OBJECTS BY AN ONBOARD RADAR STATION WITH AN ANTENNA ARRAY Russian patent published in 2022 - IPC G01S13/524 

FIELD: radar.

SUBSTANCE: invention relates to the field of radar and can be used in airborne radar stations (BRLS) to determine the speed and direction of movement of ground objects. The method is based on a telescopic survey of a section of the earth's surface, with the emission of a pulsed coherent radar signal and the reception of reflected signals s1(t), s2(t) by antenna array subarrays with radar phase centers shifted in azimuth, coherent accumulation of the received signals s1(t), s2( t), antenna aperture synthesis for each of the signals s1(t) and s2(t) in the form of two arrays of complex signal amplitudes and in coordinates i is the number of reading in azimuth, k is the number of reading in range. After that, the phase deviation Δϕ [i, k] of the signal of the first synthesized aperture is determined, caused by reflection from the stationary surface of the earth, and it is compensated with the formation of an array of complex amplitudes of the compensated signal. Next, in the received complex signal, the initial phase of the signal, caused by reflection from a moving object, is compensated, and form an array of complex amplitudes of the compensated signal Then form an array of complex amplitudes of the final compensated signal by averaging over adjacent azimuthal elements of the array of complex amplitudes, the threshold value is calculated for all its samples, their real part is compared with the threshold value, when the threshold is exceeded by the real part of the compensated signal sample, the presence of a moving object in the corresponding sample of azimuth i and range k is recorded. Next, the slant distance Rk to the moving object, the phase difference of the signals of the two sub-arrays, and the radial component of the speed of the moving object are determined. Then after the time interval T0, the operations described above are similarly repeated and the phase difference of the signals of the two sub-arrays received after the time interval T0 is determined. Next, the tangential component of the speed of the moving object is determined, and the speed of the moving object and the direction of its movement are determined from the known radial and tangential components of the speed.

EFFECT improvement of accuracy by suppressing interfering signal reflections.

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