Sar spoofing jamming method based on joint network of jammer and receiver

Abstract

The SAR spoofing jamming method of joint networking of jammers and receivers, the steps are as follows: set several receivers and jammers to network, intercept radar signals through jammers and receivers, analyze SAR signal parameters; use the intercepted radar time domain signals to calculate The instantaneous slant distance difference between each receiver and the jammer; calculate the corresponding instantaneous position and distance parameters of each receiver; construct the coefficient matrix and calculate the inverse of the coefficient matrix; calculate the modulation parameters according to the coefficient matrix and the instantaneous position and distance parameters; The instantaneous slant distance difference between the point and the jammer; the interference modulation is performed on the signal intercepted by the jammer to generate a jamming signal; the deception jamming signal is forwarded, and the opponent's radar obtains the deception jamming signal superimposed by the real scene radar signal and the false scene deception jamming signal. The method of the invention avoids the influence of the approximation error on the SAR deception jamming effect, can obtain a realistic jamming image, realizes a good jamming effect, and has the advantages of simplicity, high efficiency and accuracy.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a deception jamming method for strip SAR, spotlight SAR and scanning SAR in radar signal processing. Background technique [0002] Synthetic Aperture Radar (SAR for short) jamming techniques can be divided into suppressive jamming and deceptive jamming. The principle of suppressive jamming is relatively simple. It uses high-power random noise to "cover" the real SAR signal, reducing the echo signal-to-noise ratio and making SAR unable to image. However, suppressive jamming requires a high power of the jammer. The economic utility in the application is not high. [0003] Deceptive jamming uses electronic reconnaissance methods to obtain key parameters such as the center frequency, modulation frequency, and bandwidth of the opponent's SAR signal, and interferes with the SAR system by jamming, modulating, simulating radar echoes or echo forwarding. The princi...

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Problems solved by technology

However, the interference formation of this method is to conduct simulation analysis on the premise of knowing the position relationship between the jammer and the false target point, as well as the operating speed and repetition frequency of the synthetic aperture radar, without considering the SAR parameter error and the jammer and false target. The impact of the position error on the interference effect, at the same time, there is approximate processing in the theoretical derivation, and no precise analysis

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