基于后向散射系数模型的杂波仿真与信号重构

分析机载PD雷达的地杂波特性,研究杂波仿真技术。针对机载PD雷达地杂波形成的特点,从机载PD雷达的工作过程出发,基于后向散射系数模型,采用距离-多普勒划分法的杂波功率谱闭合计算模型,计算机载PD雷达的地杂波功率谱分布情况,经仿真分析地杂波分布规律受脉冲重复频率、载机速度和天线指向等因素的影响。提出一种时域信号重构方法,解决了如何由基于后向散射系数模型得到的杂波功率谱重构不具备时域统计特性的时域视频杂波信号的问题。

Clutter's simulation and signal reconstruction based on backward scattering factor model

The ground clutter＇s characteristic of airborne PD radar is analyzed,and the clutter＇s simulation techniques are researched.Aimed at the formative characteristic of airborne PD radar＇s ground clutter,the distribution circs of ground clutter＇s power spectrum is calculated based on the backward scattering factor model,adopted the clutter＇s power spectrum analytic calculation model of range-doppler divisiory method from the airborne PD radar＇s working process.And the influence of clutter＇s power spectrum distribution which is affected by the pulse repeat frequency（PRF）,the velocity of airplane and the point of antenna factor is analysed.A time-domain signal reconstruction method is proposed.This method resolved the problem of how can get the time-domain video clutter signal which don＇t have the statistic character from the clutter＇s power spectrum which is based on the backward scattering factor model.