超宽带探地雷达信号处理
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摘要
基于探地雷达信号传输机理,建立了超宽带探地雷达宽带回波模型,揭示了多谱分量对目标回波及宽相关处理方法的影响.利用时频分析提取回波信号的主频及带宽进行频域滤波,提高了信号的信噪比,符合匹配滤波的条件.通过构造匹配母波和匹配滤波进行精确检测,形成了工程化的滤波方法.实际数据验证了算法的有效性.
A practical wideband correlation processing was proposed for ultra-wideband ground-penetrating radar (UWB GPR).The signal model of UWB GPR was built based on the mechanism of signal transmission, which shows the effect from multi-frequency component to target wave and wideband correlation processing. Transient central frequency and transient frequency width are obtained based on time-frequency analysis. Frequency filtering can be used to satisfy the condition of matching filtering. Through building the matching original wave and matching filtering, the practical filtering is found. The experimental (results) indicate that it can be useful to improve the processing performance.
A practical wideband correlation processing was proposed for ultra-wideband ground-penetrating radar (UWB GPR).The signal model of UWB GPR was built based on the mechanism of signal transmission, which shows the effect from multi-frequency component to target wave and wideband correlation processing. Transient central frequency and transient frequency width are obtained based on time-frequency analysis. Frequency filtering can be used to satisfy the condition of matching filtering. Through building the matching original wave and matching filtering, the practical filtering is found. The experimental (results) indicate that it can be useful to improve the processing performance.
引文
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[2]Le-Tien T,Talhami H,Nguyen D T.Target signa-ture extraction based on the continuous wavelet transform in ultra-wideband radar[J].IEE Electronics Letters,1997,33(1):89-91.
[3]Stanislav V,Lawrence C,Ressler M A,et al.Ultra-wideband,short-pulse ground-penetrating radar:Simulation and measurement[J].IEEE Transactions on Geoscience and Remote Sensing,1997,35(3):762-772.
[4]Sai B L.GPR phase-based techniques for profiling rough surfaces and detecting small,low-contrast landmines under flat ground[J].IEEE Transactions on Geoscience and Remote Sensing,2004,42(2):318-326.
[5]Immoreev I Ya,Fedotov D V,Chernyak V S.De-tection of ultra wideband radar signals scattered from complex targets[A].IEEE Conference on Ultra Wideband Systems and Technologies[C].Russian,Moscow:[s.n.],2002.193-196.
[6]Sachs J,Peyel P,Roerg M,et al.Ultra-wideband principles for surface penetrating radar[A].EUROEM2000Conference[C].UK,Edinburg:[s.n.],2000.247-257.
[7]Weiss L G.Wavelets and wideband correlation pro-cessing[J].IEEE Signal Processing Magazine,1994,11(1):13-32.
[8]高静怀,汪文秉,朱光明,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.GAO Jing-huai,WANG Wen-bing,ZHU Guang-ming,et al.On the choice of wavelet functions for seismic data processing[J].Acta Geophysica Sinica,1996,39(3):392-400.
[9]詹毅,马长征,梁昌洪.宽带相关信号的参数估计问题[J].西安电子科技大学学报,1999:26(4):467-470.ZHAN Yi,MA Chang-zheng,LIANG Chang-hong.Estimation of the parameters of wide band correlative signals[J].Journal of Xidian University,1999,26(4):467-470.
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