尺度效应对脉冲压缩信号的损耗分析与评估方法OA

High-resolution radar employing pulse compression based on large time-bandwidth product signals is regarded as the de-velopment trend of future radars.Its advantages are reflected in various aspects including range resolution,detection range,weak target detection and multi-target detection.However,Doppler frequency shifts caused by the relative motion between the target and the radar lead to scale effects in the echo signals.Especially in detection scenarios with large time-bandwidth product signals and high-speed targets,gain losses in pulse compression processing are caused by the scale effects.To solve this problem,an evalua-tion method for gain losses of pulse compression signals brought by the scale effects is proposed in this paper.Firstly,mathematical models for the scale effects existing in large time-bandwidth product signals under high-speed target detection conditions are estab-lished.Subsequently,the impacts imposed by the scale effects on pulse compression processing are analyzed.An evaluation meth-od is presented to characterize the gain loss of pulse compression,in which the ratio of the moving distance of a target within the signal time width to the signal range resolution-namely the loss evaluation factor function-is adopted.Finally,quantitative an-alyses are performed on two typical pulse compression signals,linear frequency modulation signals and phase-coded signals.The correctness of the theoretical analysis is validated by simulation results.