Squinting SAR deception jamming method based on distributed receivers

Abstract

The invention relates to a squinting SAR deception jamming method based on distributed receivers. The squinting SAR deception jamming method includes the following steps: intercepting radar signals with a jammer and the receivers respectively, and analyzing SAR signal parameters; calculating delayed differences from the receivers to the jammer; calculating delayed coefficients according to the delayed differences and position coordinates of the receivers; designing position distribution of false scenes, and calculating the delayed differences corresponding to points of the false scenes with the delayed differences; conducting jamming modulation on the intercepted radar signals with the delayed differences, generating deception jamming signals, forwarding the deception jamming signals, and enabling a radar of an opposite party to obtain the deception jamming signals formed by real scene radar signals and the false scene deception jamming signals in an overlapped mode. According to the squinting SAR deception jamming method, the SAR parameters are wholly calculated, the shortcoming that the deception jamming effect is poor due to the fact that false scenes are defocused due to the fact that an existing electronic reconnaissance technology is not high in SAR parameter investigation accuracy and has parameter investigation errors is overcome, difficulty in investigation estimation on SAR squinting angles is avoided, and the squinting SAR deception jamming method has the advantages of being easy to implement, high in efficiency and high in fidelity.

Description

technical field [0001] The invention belongs to the technical field of signal processing, in particular to a method for SAR deception jamming 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 high power for the jammer. Deceptive jamming is to interfere with the SAR system by simulating radar echoes or echo forwarding on the basis of reconnaissance to obtain key parameters such as the center frequency, modulation frequency, and bandwidth of the opponent's SAR signal. Although the jamming principle is relatively complicated, it is flexible. High reliability, but also reduces the power requirements of the jammer. [0003] SAR de...

AI Technical Summary

Problems solved by technology

But the jamming effect of deception jamming largely depends on the accuracy of the reconnaissance system

With the existing detection methods, parameters such as the distance from SAR to the false scene, SAR operating speed, pulse repetition frequency (PRF) and oblique angle of view are difficult to be accurately detected. If the detected SAR signal parameters have large errors, it will lead to False scene defocusing of deceptive interference, affecting the effect of interference

[0004] Guang Yang, Shao-bin Li et al. used a squint SAR spoofing jamming method in the document "SAR COUNTER DECEPTION JAMMING BASED ON RADIOMETRIC CALIBRATION" (Radar Conference, 2009IET International, 20-22April2009:1-4), and got a good result interference effect, but the disadvantage of this method is that it is based on the precise detection of SAR parameters, and the literature does not consider the precise detection of oblique viewing angles

However, this method is also implemented on the basis of accurate detection of SAR parameters. When the parameter error is large, the influence of parameter detection error on the jamming effect is not fully considered.

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