时频分析在超宽带散射信号处理中的应用

Application of time-frequency analysis on UWB scattering signal processing

简要介绍了伪Wigner分布和小波变换信号处理中的分析方法,描述了在超宽带散射信号分析中的应用情况,对一些简单形状的金属散射体的双站背向散射信号作了实际测量,并且用伪Wigner分布和小波分析方法对这些信号进行了时频分析,由此验证了超宽带信号在目标探测和识别方面的优越性。

In this paper, the basic principle of the timefrequency(TF) analysis, including wavelet transform, is depicted briefly. It's application on UWB scattering signal is introduced in detail also. Through the processing of UWB scattering signal from tested target with the aid of the TF analysis, the signature of the target can be gotten easily so that the detection and discrimination of the target might be improved. In the work, the measurement of scattering signal was made for some simple shaped metal targets which was in air or hidden in some kinds of soil and leaves using picosecond pulse generator (PPG) in the form of bistation configuration, and the experimental data was processed with pseudo Wigner distribution and Mayer wavelet transform. The analytical results prove the superiority of UWB pulse (noncarried) in the detection and identification of target.