基于长时间相参积累的拖曳式诱饵分辨算法

Resolving Towed Decoy Based on Long-Term Coherent Integration

针对准连续波雷达导引头信号处理及拖曳式雷达诱饵的干扰特性,提出了一种长时间相参积累的方法来完成目标及诱饵的多普勒频率域分辨.通过使用分数阶傅里叶(FrFT)变换对目标与诱饵的回波信号进行多普勒处理,解决了弹目径向加速度造成的多普勒频谱展宽问题.提出使用最小波形熵作为分数阶次搜索准则,降低分数阶次估计误差.计算机仿真结果验证了该方法的有效性.

According to the signal processing principle of interrupted continuous-wave radar homing head and the interference principle of towed decoy, a long-term coherent integration method is proposed for resolving the target and towed decoy in the Doppler frequency domain. Instead of the Fourier transform, the method uses the FrFT（fractional Fourier transform） for Doppler processing which is less vulnerable to the radial acceleration. The least waveform entropy criterion is also proposed to give a more robust estimation of the FrFT order. Some computer simulation results are presented which illustrate the effectiveness of the method.