超宽带穿墙探测雷达TH-UWB脉冲串信号分析

Analysis on Time-Hopping sequences modulated UWB pulses for through-the-wall detecting radar

从定义出发推导了跳时调制超宽带广义高斯脉冲串(GGP)波形距离模糊函数的解析表达式,并通过仿真分析该波形模糊函数与跳时序列自相关特性、序列周期、脉冲平均重复周期、有效时间宽度、时间尺度因子及调制系数的关系。结果表明:选择良好自相关特性和较长序列周期的跳时序列可增强旁瓣抑制能力;增大时间尺度因子或减小有效时间宽度可增加距离分辨力;权衡选择适宜的调制系数不仅保持波形原有的距离分辨特性,而且有利于采用距离门技术抑制旁瓣。

An analytical expression of the range ambiguity function for a train of time-hopping modulated ultra-wideband （TH-UWB） GGP waveforms is derived. Subsequently, the relation of the range ambiguity function with the autocorrelation properties, period of time-hopping sequences, and the average pulse repetition period, effective duration, scaling parameter and modulating coeffiecient of GGP pulses is analyzed with numerical simulations. The results show that range side-lobe suppression characteristic is improved by choosing the good autocorrelation properties or long period of TH sequences, and the range resolution is increased with the short effective duration or large sealing parameter. Moreover, the appropriate modulating coeffiecient is chosen in order to preserve the range resolution and apply the range gate technique for side-lobe suppression.