中文摘要：

超宽带探地雷达应用中，射频干扰的抑制是一个重要的研究课题。射频干扰是影响目标检测和合成孔径成像效果的关键因素之一。针对无载波脉冲探地雷达，本文分别在3种信息数据采集方式：实时采样、周期等效采样和随机等效采样下，对均值滤波后的射频干扰特征进行了分析。分析指出采用随机等效采样，在不影响目标回波获取的情况下，可将射频干扰变为零均值随机信号，进而用经典的均值滤波方法进行干扰抑制。实验结果验证了本文分析的正确性和随机等效采样对射频干扰抑制的有效性。

英文摘要：

The radio frequency interference （RFI） suppression is one of the key research subjects for ultra-wide band ground penetrating radar （GPR）, which makes the most performance degradation in object detection and synthetic aperture imaging （SAI）. This paper compares the RFI properties of the impulse GPR after average filtering using three different sampling modes： real time sampling, periodic equivalent time sampling and random equivalent time sampling. Analysis indicates that the RFI can be transformed into zero-mean random signal using random equivalent time sampling mode without effecting on the object information and can be suppressed easily using a classical average filter. Experimental results conform to that of the theoretic analysis and indicate that the proposed method is effective.