UWB信号的穿墙传播特性研究

Study on Through-wall Propagation Properties of UWB Signal

超宽带信号的穿墙传播特性研究是决定穿墙成像成功的关键因素。文中利用时域有限差分方法仿真模拟了超宽带穿墙雷达成像场景,分析了墙体作用对目标散射信号的影响,仿真结果验证了超宽带信号在穿墙过程中经历了时间的延迟、信号的衰减以及波形的失真。此外,定性讨论了超宽带信号中心频率、接收天线采样位置、墙体材料以及厚度和目标信息对接收天线处提取的目标散射信号的影响。

The through-wall propagation properties of UWB signals is a crucial factor for the success of through-wall imaging. This paper analyzed the effects of walls on backscattered signal of an object. The UWB propagation through walls is simulated by finite-difference time-domain （FDTD）. The simulated results show that UWB signals suffer time delay, attenuation and distortion during propagating through walls. Moreover, the effects of UWB central frequency, sampling positions of receiving antenna, material or thickness of walls and information of an object on backscattered signal are also discussed qualitatively.