天基监视雷达的距离游走和距离重叠补偿研究

Research on Correcting of Range Walking and Range Foldover of Space-Based Surveillance Radar

为了实现天基雷达杂波消除、高分辨率的角度估计和广域监视功能,采用三通道相位中心偏置天线(DPCA)/monopulse(单脉冲)信号处理系统。天基雷达的运动和地球自转,使得地球上每一点的杂波都产生了附加的多普勒成分——距离游走效应。距离游走与距离重叠效应相结合,显著地降低DPCA处理算法的杂波抑制性能。针对距离游走效应在相干处理阶段进行反向补偿、在非相干积累阶段采用线性内插的方法进行校正,针对距离重叠效应采用基于普罗米修斯结构的波形分集技术进行校正。实验结果显示,提出的距离游走和距离重叠综合补偿方案显著提高杂波抑制效果。

To derive clutter cancellation, high resolution angle estimation and wide-area surveillance, Space-Based Radar （SBR） uses the signal processing system of 3-Channel DPCA/monopulse. Radar＇ s motion and earth＇ s rotation generates a Doppler frequency component to the clutter return from any point on the earth range walking. It is shown that range walking together with range foldover significantly degrades the clutter suppression performance of DPCA algorithms. Effects of range walking are eliminated by appropriate inverse compensation during coherent processing interval and linear interpolations during Non-coherent interval. Effect of range foldover is eliminated by use of waveform diversity based on Prometheus construction. The simulation result shows that the correcting approach purposed can improve the effect of clutter suppression markedly.