基于小波变换的信号滤波在探地雷达中的应用
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摘要
利用小波变换的时频局域性,提出了一种探地雷达信号处理的滤波方法。在连续小波变换的基础上,同时联合尺度和频率,通过能量分析确定回波信号主要分量所在区间,通过尺度分解和频域滤波剔除干扰分量,在此基础上重构信号,提高了信噪比。并针对不同连续小波基对信号处理的性能进行分析,对比结果表明与雷达发射母波相似的小波基在探地雷达信号处理中更有效。
A practical GPR signal process method is proposed by employing wavelet transform characteristic in time domain and frequency domain. Based on continuous wavelet transform, through scale decomposition and frequency filtering, the main component of echo signal is extracted by energy analysis, the disturbed component is eliminated. The SNR of reconstructed echo signal is improved. Meanwhile the method is applied to radar echo signal processing with different mother wavelets, the performance is analyzed, and it indicates that the mother wavelet similar to radar transmit signal is optimum in GPR signal processing.
A practical GPR signal process method is proposed by employing wavelet transform characteristic in time domain and frequency domain. Based on continuous wavelet transform, through scale decomposition and frequency filtering, the main component of echo signal is extracted by energy analysis, the disturbed component is eliminated. The SNR of reconstructed echo signal is improved. Meanwhile the method is applied to radar echo signal processing with different mother wavelets, the performance is analyzed, and it indicates that the mother wavelet similar to radar transmit signal is optimum in GPR signal processing.
引文
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[2]Fang Guangyou.Michele Pipan,Instantaneous parame-ters calculation and analysis of i mpulse ground pene-trating radar(GPR)data[C].International Geoscience and Remote Sensing Symposium,2001,6:2695~2697.
[3]Perrin,S Bibaut,A Duflos,et al..Use of wavelets for ground-penetrating radar signal analysis and multi-sensor fusionin the frame of land mine detection[C].IEEEInternational Conference on Systems,Man,and Cybernetics,2000,4:2940~2945.
[4]黄亮,文必洋,邓巍.高频地波雷达抑制瞬态干扰研究[J].电波科学学报,2004,19(2):166~170.L Huang,B Y Wen,W Deng.Suppressing instantane-ous interference of high frequency ground wave radar[J].Chinese Journal of Radio Science,2004,19(2):166~170.
[5]T Le-Tien,HTalhami and D T Nguyen.Target signature extraction based on the continuous wavelet transformin ultra-wideband rdar[J].IEEE Electronics Letters,1997,33(1):89~91.
[6]陈文超,师振盛,汪文秉,等.小波变换在去除探地雷达信号直达波的应用[J].电波科学学报,2000,15(3):352~357.WC Chen,Z S Shi,WB Wang,et al..Suppressingthe di-rect wave noise in GPRdata using the2-Dcontinue direc-tional wavelets[J].Chinese Journal of Radio Science,2000,15(3):352~357.
[7]高静怀,汪文秉等.地震资料处理中小波函数的选取研究[J].地球物理学报,1996,39(3):392~400.
[8]任春辉,魏平,肖先赐.改进的Morlet小波在信号特征提取中的应用[J].电波科学学报,2003,18(6):633~637.C H Ren,P Wei,X C Xiao.Application of a modified morlet wavelet infeature extraction[J].Chinese Journal of Radio Science,2003,18(6):633~637.
[9]Li Jianxun,XiaoYanjun.Research on signal processing of ultra-wideband ground penetrating radar[C].the IASTED International Conference on Signal and Image Processing,2004.
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