脉宽-调频极性捷变波形相参处理能力分析

脉间捷变波形的匹配滤波响应存在差异,对地/海杂波等效为距离旁瓣调制(range sidelobe modulation,RSM),导致杂波抑制能力下降,甚至无法进行相参处理.针对线性调频(linear frequency modulation,LFM)信号在带宽恒定前提下,改变脉宽和调频极性后具有主瓣宽度相同、旁瓣幅度...

Analysis of coherent processing capability of pulse width-FMpolarity agile waveform

The matched filter response of the interpulse agile waveform is different, and the ground/sea clutter is equivalent to the range sidelobe modulation (RSM), which leads to a decrease in clutter suppression ability and even incapability of coherent processing. Aiming at the characteristics of the linear frequency modulation (LFM) signal with the same main lobe width and small sidelobe amplitude fluctuation after changing the pulse width and frequency modulation polarity under the premise of constant bandwidth, the ambiguity function, peak gain loss, single-channel moving target indicator (MTI) processing performance and space-time processing performance are analyzed in this paper. The simulation results show that under the condition that the time width-bandwidth product is more than 1 000 and the normalized pulse width change is less than 0.4, the target accumulation loss is less than 1 dB, the single-channel time-domain clutter suppression capability is better than 29 dB when the pulse width is slipped, the space-time clutter suppression processing loss is less than 1 dB when the clutter to noise ratio (CNR) is lower than 40 dB.