INTERFERENCE SUPPRESSION METHOD Russian patent published in 2011 - IPC G01S7/36 

FIELD: radio engineering.

SUBSTANCE: in suppression method of interference representing mixture of interference from fixed local objects (LO) and moving passive interference (PI), in which from the signals and interference received with radar in N periods of repetition of coherent bock, where N≥3, there formed are references of complex envelope x_i,k, where i - number of repetition period of coherent block, 1≤i≤N, k - number of range element, there formed is window of N_u, range elements enveloping k element in which correlation parametres of interference are evaluated, including correlation coefficients of interference between neighbouring repetition periods of coherent block; evaluations of correlation parametres of interference are used for filtration of signals against mixture of interference from LO and PI, the following is performed: references of complex envelope x_i,k are supplied to N processing channels; at that, in j channel where j=1,…,N, at j≥2 they are first supplied to rejector filter of interference suppression from fixed LO of (j-1) order with binomial weight coefficients where m=1,…j; then, from references z_i,k(j) at the outlet of the above filter there formed is the above window from N_w, range elements enveloping k element in which there evaluated is the above interference correlation coefficient between neighbouring j and j+1 repetition periods of coherent block where - evaluations of module and phase of interference correlation coefficient, references z_i,k (j) are turned to phase in p repetition period of coherent block, where p=j,…,N so that phase of moving PI can be compensated; then at j≤N-1 those references are supplied to rejecter filter of interference suppression from moving PI of the same channel with actual coefficients w_2n, where n=1,…,N-j+1, which are found from pre-calculated ones for PI suppression with zero phase of correlation coefficient, Gaussian spectrum shape and various values of correlation coefficient module ρ₀, which are specified with accuracy Δρ₀ in the range of 0 to 1 so that design value ρ₀ can differ from the obtained evaluation by not more than the accuracy value Δρ₀; at outlets of rejector filters of interference suppression from moving PI in N processing channels there measured is interference power in window from N range elements enveloping k element, where N is chosen on the basis of allowable reduction of interference suppression as per minimum evaluation of interference power processing channel performing the above function of signal filtration against mixture of interference from LO and PI is chosen as output channel.

EFFECT: simplifying technical implementation of the method without reduction of suppression of mixture of interference from fixed local objects and moving passive interference.

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