PD雷达谱分析中的帧重叠ZoomFFT优化设计

针对脉冲多普勒(PD)雷达回波信号频谱分析问题,提出了帧重叠ZoomFFT方法。该方法既可以获得信号局部频谱的高分辨率,又可以提高FFT相参积累的增益,从而提高了PD雷达微弱信号的检测能力以及参数测量精度。文章在介绍该方法基本原理的基础上,针对高重频(HPRF)PD雷达应用,提出了帧重叠ZoomFFT方法的参数设计准则。同时分析了帧重叠对于非相参积累和目标检测的影响,并且给出了具体应用的参数设计及其性能仿真,最后介绍了采用帧重叠ZoomFFT方法的PD雷达信号实时谱分析系统的实现方案。

Frame-overlapped ZoomFFT optimization in PD radar spectrum analysis application

A frame-overlapped zoom-FFT method applied to pulse Doppler(PD) radar echo spectrum analysis is addressed.High resolution of signal local spectrum is achieved while coherent integration gain is improved by this method.As a result,the detection probability and the parameter estimation precision for weak echoes are enhanced.The principle of frame-overlapped ZoomFFT is firstly introduced.Then the parameter design criterions in high pulse repeat frequency(HPRF) PD radar application are presented.Furthermore after analyzing the effects on incoherent integration and target detection resulting from frame overlap,the parameter design process is illustrated by an example and the detection performance of overlap processing is compared with that of no-overlap processing by simulation.Finally,a real-time spectrum analysis system implementation adopting this method is proposed.