时频分布与雷达信号的多目标分辨

Time-Frequency Distribution and Multi-target Resolution of Radar Signal

编队飞行的目标,由于它们之间的间距很小,利用目标回波多普勒频率的差别有可能分辨目标。本文介绍了时频分布的基本概念,用线性调频(LFM)信号模型来表示多普勒回波信号的变化,采用时频分布的方法来分辨编队目标,并举用常见的Wigner Vill分布(WVD)、Choi Williams分布、Wigner Hough变换对窄带多目标雷达信号数据进行了分析比较。

Due to the short distance between planes which fly in a group, the difference among Doppler frequency of the targets may be used to separate them. Firstly, TimeFrequency Distribution is introduced in this paper. Doppler echoes can be modeled as linear frequency modulated (LFM) signal. And the timefrequency analyzing methods are used to analyze the signal. The radar simulated data is analyzed by Wignervill Distribution (WVD), ChoiWilliams Distribution(CWD) , WignerHough Transform . It is shown by simulation results that TimeFrequency Distribution can resolute multitargets of radar signal, but different distribution has different quality. 