CAJ | 학술논문

针对频率步进雷达体制中高莺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.
침대빈솔보진뢰체체제중고앵빈도치적잡파절첩현상,본문제출료일충유효적절첩잡파억제방법.수선재접수궤전단공제중빈대통려파기적통대범위이억제거리처리간격지외적절첩잡파,병설계발사맥충포락이리우경호지삭약해절첩잡파회파;연후통과파형삼수설계급고분변처리이진일보억제거리처리간격내적절첩잡파.해방법불수요개변기본적빈솔보진파형,야불회증가빈솔보진뢰체신호처리적복잡도,구유간단역행적우점.차외,본문환통과비교표명고중빈빈솔보진뢰체비PD뢰체재절첩잡파억제방면구유경호적성능.방진실험험증료소제방법적유효성.
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 change the basic stepped frequency waveform or complicate the signal processing of stepped frequency radar. Therefore, it has the advantages of simple-heSS 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.