高重频频率步进雷达抑制折叠杂波方法

A Method of Suppressing Folded Clutter in High PRF Stepped Frequency Radar

针对频率步进雷达体制中高重频导致的杂波折叠现象,本文提出了一种有效的折叠杂波抑制方法。首先在接收机前端控制中频带通滤波器的通带范围以抑制距离处理间隔之外的折叠杂波,并设计发射脉冲包络以利于更好地削弱该折叠杂波回波;然后通过波形参数设计及高分辨处理以进一步抑制距离处理间隔内的折叠杂波。该方法不需要改变基本的频率步进波形,也不会增加频率步进雷达信号处理的复杂度,具有简单易行的优点。此外,本文还通过比较表明高重频频率步进雷达比PD雷达在折叠杂波抑制方面具有更好的性能。仿真实验验证了所提方法的有效性。

A method is proposed to suppress the folded clutter which is caused by high pulse repetition frequency （PRF） of stepped frequency radar. Firstly, the folded clutter outside the range processing interval is attenuated by the intermediate frequency （IF） band-pass filter in the receiver＇ s foreside. In order that the band-pass filter can reject the external folded clutter more effectively, the transmitted pulse envelope is designed. Secondly, the folded clutter within the range processing interval is further cancelled using high range resolution processing of the return signal on condition of specific waveform parameters. The method does not ehange the basic stepped frequency waveform or complicate the signal processing of stepped frequency radar. Therefore, it has the advantages Qf simpleness and effectiveness. Comparing with pulse Doppler （PD） radar, high PRF stepped frequency radar is better at suppressing folded clutter. Simulation results validate the correctness of the method.