Random pulse jamming model and TH-BPM (Time Hopping-Binary Phase Data Modulation)UWB communication system model were established with the background noise being neglected. Soft decision detection and hard decision detection were studied respectively, and the relation between anti -jamming performance and two parameters of pulse and TH code was found. Both theoretical analysis and simulation results show that the performance of soft decision is not always better than hard decision, the performance of multi -pulses receiver is actually not as good as mono-pulse receiver when soft decision is applied with low SJR, and TH code has a slight impact on random pulse jamming.%基于忽略背景热噪声影响的前提,建立了随机脉冲干扰模型和调时-二相调制超宽带(TH-BPM-UWB)通信系统模型.对软判决检测方式和硬判决检测方式分别作了研究,确定出脉冲参数、跳时码参数与超宽带通信系统抗干扰性能之间的关系.理论分析和实验仿真表明:软判决的性能并不总是优于硬判决；当多脉冲接收机采用软判决且信干比较小时,其性能反而不如单脉冲接收机；跳时码调制对随机脉冲干扰的影响很小.
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