超宽带搜救雷达发射信号及径向分辨率研究

研究给出了城市灾害救助与生命搜索用超宽带搜救雷达的发射信号模型、目标信息模型、回波模型，在此基础上对雷达径向分辨率与发射信号脉冲宽度、脉冲间隔、脉冲串长度的关系进行了分析探讨。并对模型在Matlab上做了仿真。得出结论，随着雷达脉冲信号宽度增加，信号的UWB特性逐渐消失，目标对信号的多散射中心个数逐渐减少，直至成为点散射，雷达径向分辨能力逐渐变差，雷达一维时间图像逐渐变得模糊。

A Study on the Transmitted Signal and Range Resolution of UWB Search and Rescue Radar

In this paper, the transmitted signal model, the target signature model and the received signal model of UWB radar used for urban emergency search and rescue, are presented. More than that, the relationship between the range resolution of radar and the duration of the transmitted UWB-pulse, the time separation between the pulses, the length of the transmitted signal, have also been analyzed. The signal models are all simulated on the Matlab and good conclusions are drawn from them. When the width of signal pulse of radar is smaller, the UWB property of the signal disappears gradually. Multi - scatter - centers reduces to one, the range resolution of radar becomes worse, the image of radar turns more illegible.