Research On Anti-jamming Methods Based On Adaptive Filtering

The spectrum of electromagnetic wave is becoming more and more crowded. In addition, active deception jamming has developed. Both of these make the radar face spectrum interference and active deception jamming, which degrades target detection performance. Adaptive filtering is an effective technology to suppress range and Doppler sidelobe, which can improve the detection performance. Therefore, it is potential to improve survival ability and detecting ability of radar when the technology is applied to anti-jamming field.This dissertation focuses on the spectrum interference, range deception jamming, velocity deception jamming and range-velocity two-dimensional deception jamming, which studies several interference suppression methods based on the adaptive filtering algorithm, mainly including the following:1. Aiming at the problem of anti-electromagnetic spectrum suppressing interference, the anti-spectrum interference method based on the adaptive filtering algorithm is proposed, which can restrain interference and range sidelobe spectrum more effectively compared to the existing method based on the least squares algorithm.2. Aiming at the typical anti-range deception jamming on behalf of false target jamming and intercept copy(C&I) interference, the principle is analyzed and mathematical model is set up. Algorithm based on adaptive filtering of anti-range deception jamming resistance method is proposed, which can effectively estimate the range profile of both the real goal and the range false targets. In addition, we analyze the applicable conditions of adaptive filtering algorithm to different types of interference and how interference bandwidth such parameters effect the performance of the algorithm.3. Aiming at the velocity deception jamming, the production principle is analyzed and the mathematical model is set up. Then we propose the anti-velocity deception jamming method based on adaptive filtering, which can estimate the velocity of the real targets and interference of false targets effectively. In addition, we analysis how interference power and interference target quantity effect the performance of the algorithm.4. Aiming at the range-Doppler two-dimensional deception jamming, the mathematical model is set up. We propose the method of anti-range-Doppler two-dimensional deception jamming based on adaptive filtering algorithm, which can estimate the range-Doppler plane of both the real targets and the false targets effectively by suppressing the autocorrelation sidelobe, cross-correlation sidelobe and Doppler sidelobe of the real target echo and the false target echo.The above methods have been verified effective by simulation. The proposed adaptive filtering algorithms can suppress interference and improve the performance of target detection to a certain extent.