METHOD FOR DISTORTION OF RADAR IMAGE IN SPACE RADAR STATION WITH SYNTHETIC ANTENNA APERTURE Russian patent published in 2017 - IPC G01S13/90 G01S7/38 

FIELD: radio engineering.

SUBSTANCE: invention relates to radio engineering, in particular, to methods and equipment for electronic jamming of radar stations with synthetic antenna aperture (SAR). Said result is achieved by the following: method of distortion of a radar image in SAR, based on receiving by the relay station probing pulses of space SAR s_p(t), their amplification, transfer of carrier frequency to an intermediate frequency, filtration, analogue-to-digital conversion with a certain interval of sampling, recording the obtained sequence of digital readings, filtering and radiation of relayed radar signals in the direction of space SAR, followed by setting the dimensions of the masked elliptic area, for which is a false mark is formed, vector of geocentric coordinates of the point of the Earth's surface, corresponding to position of the center of the false marks, is calculated for each probing current distance between space SAR and point on the Earth's surface, corresponding to the position of the center of the false marks and the distance between space SAR and transponder, forming N realizations of functions of fast and slow phase modulation, distributed as per the Gaussian laws with zero mathematical expectation, mean-square deviations and certain correlation intervals, setting the law of pulse modulation (modulation function) in the form of a series of digital readings, converting the generated sequence of digital readings to analogue relayed pulse, transferring its frequency from intermediate to carrier and amplifying to a certain power level. Core of the invention is that the functions of fast and slow modulation used when forming relayed radar signal provide blur effects of the false mark with the respect to the coordinates of the inclined line and track distances by introducing uncertainty into the current phase of the retransmitted signal and random additional initial phase shift of the next additional retransmitted signal pulse respectively.

EFFECT: technical result is reduction of probability of correct detection masked objects by space SAR.

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