MOVING TARGET SELECTION METHOD Russian patent published in 2024 - IPC G01S13/524 G01S7/36 

FIELD: physics.

SUBSTANCE: invention relates to radar and can be used in coherent-pulse, pulse-Doppler radar stations, which detect moving targets against the background of passive interference of various origins, for example, reflections from the underlying surface, meteorological formations, clouds of dipoles, using moving target selection systems (MTS). In the disclosed method, the radar antenna receives a packet of N pulses, quadrature components of the complex envelope of the received packet of signals are extracted, in each of which the signals are converted to digital form. From the obtained complex digital samples of the received packet of N pulses in the range strobe, a vector of input data Y of size N × 1, over which inter-period filter processing is performed by N-point fast Fourier transform (FFT) algorithm. Calculating weight vector b of size M × 1, the elements of which are determined by the value of the complex frequency characteristic of the n^th Doppler filter at the passive interference frequency ƒ_m, M is the number of sinusoids used for the passive interference approximation, which with a certain pitch overlap the passive interference frequency range in order to provide a given suppression coefficient, as well as the value of the complex frequency characteristic of the Doppler filter, in which the passive interference is suppressed at frequencies ƒ_m. Calculating the value Δ according to expression , where u_0,s is a complex signal in the s^th range gate at the output of the Doppler filter, in which passive interference is suppressed, u is a vector whose elements u_m,s are complex signals at the output of Doppler filters with numbers in the s^th range gate, T is the vector transposition sign, comparing the magnitude Δ with preset threshold η, when the threshold is exceeded, a decision is made on the presence of a moving target.

EFFECT: high efficiency of selecting moving targets while increasing power and width of the passive jamming spectrum.

1 cl, 6 dwg