小波变换域的空间选通滤波算法抑制雷达RFI

该文在分析了冲激雷达接收中存在的射频干扰(RFI)的性质与特征的基础上,研究了超宽带时域接收机中的RFI抑制问题。针对超宽带的探地雷达(GPR),依据目标回波信号与RFI在小波域各尺度上分布的差异性和小波变换的多分辨分析理论,提出了小波域的多尺度空间选通滤波算法,对实测的超宽带GPR数据进行了RFI抑制处理,并对算法的性能进行了评估,同时与频域陷波法作了比较,结果表明该方法能较好地抑制GPR中的RFI,超过88%的RFI被抑制,并且有很好的信号保真度,其性能较频域陷波法有较大提高。

Radar RFI Suppression Using Spatially Selective Filtration

This paper firstly analyzes the sources and properties of the RFI signal, and compares the characteristics of object's echo and RFI in wavelet transform domain, and then based on the different behaviors of their wavelet coefficients over many wavelet scales and the theory of multiscale decompositions, the spatially selective filtering method of RFI suppression is proposed. The performance of the method is validated on experimental data of Ground Penetrating Radar, over 88 percent of RFI is suppressed effectively by the algorithm in the experiment and little impact is made on the object's echo wave. We have compared the performance of the method to that of the notch filter in frequency domain and found it to be superior.