小波降噪在雷达制导空空导弹导引头上的应用

针对雷达制导空空导弹导引头因视线角速度电信号混有噪声而导致制导精度降低的现实，基于雷达导引头的高斯白噪声模型，提出了运用小波阈值降噪法改善信噪比．一方面，介绍了小波分析的基本理论和小波阈值降噪原理；另一方面，利用Matlab中的小波分析工具对雷达导引头视线角速度含噪信号进行了小波阈值降噪的离线和实时数值实验．仿真结果表明，小波阈值离线和实时降噪法都可以显著地提高雷达导引头信号的信噪比，并且可以应用于导弹的地面测试和飞行试验中．

The Application of Wavelet De-noising to the Radar Seeker of Air-to-air Missile

Aiming at the fact that the guidance accuracy of radar seeker of air-to-air missile declines due to noise effect on the electric signal from line of sight angular velocity, the method of wavelet de-noising via thresholding to improve signal-to-noise ratio is presented on the base of radar seeker model of Gauss white noise. The basic theo.ry of wavelet analysis and the principle of wavelet de-noising via thresholding are introduced. The wavelet analysis tools in Matlab are used for the off-line and real-time numerical experiments of the method of wavelet de-noising via thresholding on line of sight angular velocity signal plus noise for radar seeker. The simulation results show that both the off-line method of wavelet de-noising via thresholding and the real-time one can improve the signal-to-noise ratio of radar seeker significantly and they can be applied to missile ground tests and flight tests.