多径环境中宽带信号的时延-尺度性能分析

Dalay-Scale Performance of Wideband Signals in Multipath Ocean Environment

该文根据宽带目标回波模型,建立了多径宽带回波模型,分别推导出了多径环境下矩形、高斯包络线性调频信号和双曲调频信号宽带模糊度函数。分析比较了不同的发射波形在多径环境中的时间分辨率。并通过对多径矩形包络线性调频信号和高斯包络双曲调频信号回波的仿真,分别给出了两条和三条路径时,两种不同发射信号的多径回波信号的宽带模糊度函数图。仿真结果表明在多径环境中高斯包络的双曲调频信号多普勒容限优于矩形包络线性调频信号,这样我们就可以忽略尺度对模糊度函数的幅值的影响。

According to the model of wideband target echo , we developed the wideband echo models in multipath . Then, we deduced the wideband ambiguity functions of rectangular - weighted LFM and Gaussian - weighted HFM signals and compared their time resolution in multipath. At last, two - path and three - path simulations were finished respectively. The results show that the Doppler tolerance of Gaussian - weighted HFM signals is better than that of rectangular - weighted LFM signals, so we can ignore the effect produced by scale on the amplitude of ambiguity funtions.