高分辨率探地雷达步进系统的研究与实现
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摘要
基于对探地雷达回波信号的分析,提出了等效时间取样的探地雷达系统的设计方法。并分析了天线中心频率、分辨率和取样间隔的关系,构建了一种步进时间达到1.25×10-2ns的步进系统,实现了高分辨率的探测。最后,采用研制的探地雷达实验系统进行了实际探测实验,探测结果表明,等效时间取样技术对该系统是有效的,且步进系统的稳定性是较高的。
In this paper,a ground penetrating radar(GPR)with equivalent-time sampling is designed by analyzing the return signal od the radar.By employing the relationship of antenna center frequency,resolution and sampling separation,a step-sampling pulse generator with ns precision is designed for realizing high resolution detection.The measured data from a experimental radar show the validity of the proposed method.
In this paper,a ground penetrating radar(GPR)with equivalent-time sampling is designed by analyzing the return signal od the radar.By employing the relationship of antenna center frequency,resolution and sampling separation,a step-sampling pulse generator with ns precision is designed for realizing high resolution detection.The measured data from a experimental radar show the validity of the proposed method.
引文
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[16]钱卫明,阴泽杰,吴孝义.可编程延时芯片及其在系统时序控制中的应用[J].核电子学与探测技术,2000,20(4):305-307.
[2]范国新,陈平.探地雷达原理、设计思想及其实现[J].电波科学学报,1992,7(3):1-20.Fan G X,Chen P.The ground-probing radar′sprinciple,design consideration and its implementation[J].Chinese Journal of Radio Science,1992,7(3):1-20.
[3]李海华.探地雷达体制综述[J].测试技术学报,2003,17(1):25-28.
[4]方广有,佐藤源之.频率步进探地雷达及其在地雷探测中的应用[J].电子学报,2005,33(3):436-439.
[5]F Parrini,M Pieraccini,and C Atzeni.A High-speedContinuous Wave GPR[C].Proceedings of the TenthInternational Conference on Ground PenetratingRadar,2004,1(5):183-186.
[6]D J Daniels.Surface-penetrating Radar[J].Electronics&Communication Engineering Journal,1996,8(4):165-182.
[7]郑君里.信号与系统[M].北京:高等教育出版社,1981.
[8]朱华,黄辉林等.随机信号分析[M].北京:北京理工大学出版社,1990.
[9]D J Daniels,D J Gunton and H E Scott.Introductionto Subsurface Radar[C].IEEE Proc,1988,135(4):278-320.
[10]`Kallweit R S,Wood L C.The limits of resolution ofzero-phase wavelets[J].Geophysics,1982,47(7):1035-1046.
[11]O Yilmaz.Seismic data processing[M].Tulsa:Society of Exploration Geophysicists,1987.
[12]M A Widess.How thin is a thin bed?[J].Geophysics,1973,38(8):1176-1254.
[13]徐怀大,王世凤,陈开远.地震地层学解释基础[M].北京:石油工业出版社,1990.
[14]云美厚.地震分辨率[J].勘探地球物理进展,2005,27(1):12-18.
[15]袁明德.浅析探地雷达的分辨率[J].物探与化探,2003,27(1):28-31.
[16]钱卫明,阴泽杰,吴孝义.可编程延时芯片及其在系统时序控制中的应用[J].核电子学与探测技术,2000,20(4):305-307.
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