SAR deception jamming method with jammers and receivers jointly networked

Abstract

An SAR deception jamming method with jammers and receivers jointly networked includes the following steps that the multiple jammers and the multiple receivers are arranged for networking, radar signals are intercepted through the jammers and the receivers, and SAR signal parameters are analyzed; through the intercepted radar time domain signals, the instant slope distance difference from all the receivers to the jammers is calculated; the instant position distance parameters corresponding to all the receivers are calculated; a coefficient matrix is constructed, and the inverse of the coefficient matrix is calculated; according to the coefficient matrix and the instant position distance parameters, modulation parameters are calculated; the instant slope distance difference of points in jamming scenes relative to the jammers is calculated; jamming modulation is performed on the signals intercepted by the jammers to generate jamming signals; the deception jamming signals are forwarded, and an opposite-side radar obtains deception jamming signals with real-scene radar signals and the false-scene deception jamming signals overlapped. The method avoids influences of approximate errors on SAR deception jamming effect, vivid jamming images can be obtained, good jamming effect is achieved, and the method has the advantages of being simple, efficient and accurate.

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) 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 principle of spo...

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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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