METHOD FOR SPATIAL COMPENSATION OF DIRECT AND REFLECTED SIGNALS WHEN A REFLECTED SIGNAL FROM AN AIR TARGET IS DETECTED BY A BISTATIC RADAR SYSTEM Russian patent published in 2020 - IPC G01S5/06 G01S13/56 H01Q3/26 H04B1/12 

FIELD: radar ranging.

SUBSTANCE: invention relates to radar and is intended for detection of a signal reflected from an air target, against a background of a direct probing signal from a radio transmitter, and signals reflected from stationary objects. In the method of spatial compensation of direct and reflected signals when a reflected signal is detected from an air target by a bistatic radar system, a radio transmitter transmitting the probing signal is used, and a radio receiver comprising an adaptive antenna array (AAA) consisting of antenna elements, a beam-forming circuit with weight coefficients, an adaptive control pattern and an adder unit. Method comprises emitting a probing signal by a radio transmitter, receiving a radio signal from a radio target reflected from an air target, as well as direct sounding signal from radio transmitter and signals reflected from stationary objects. At the output of the adder, using the recursive estimation of the weight coefficients vector, the signal s(t)=W^H(t)X(t) is output, where X(t) is a vector of complex signals x_n(t), n = 1, 2, … , N in AAA channels, N is the number of antenna elements, W^H(t) is the transposed and complex conjugate vector of weight coefficients w₁, w₂,… w_N, W(t)=W(t-1)+kG(t), t – time counts, k – scalar gain factor. For k<0, AAA provides minimization of power, while k>0 provides maximization. Providing detection of a weak radio signal reflected from an air target against the background of strong interfering signals is achieved using a variable amplification factor determined depending on the gradient of the mean square of the output signal s(t).

EFFECT: high rate of adaptation and low dispersion of residual noise at low ratios of signal amplitude reflected from target, to amplitudes of interference signals.

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