| 探地雷达空气回波特点与处理方法 |
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| 引用本文： | 石建平,;张志勇,;邓居智.探地雷达空气回波特点与处理方法[J].国外铀金地质,2009(3):172-177. |
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| 作者姓名： | 石建平 ;张志勇 ;邓居智 |
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| 作者单位： | [1]湖南核工业地质局304大队,湖南长沙410003; [2]东华理工大学,江西抚州344000; [3]中国地质大学（北京）,北京100083 |
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| 摘 要： | 探地雷达发射的电磁波在整个空间传播，存在空气中回波，空气中回波可分为以下3种：直达波、系统振铃、反射回波。直达波位于探地雷达记录的初期很小时间段，对识别地下介质反射影响不大，系统振铃和地表反射体的回波是探地雷达探地工作的主要干扰。空气中反射体的反射回波时距曲线一般有两种形式：双曲线型、线型。可以通过计算介质中电磁波波速来识别反射回波是空气中反射体形成的，还是地下介质反射形成的。应用水平背景移除、二维滤波可以有效滤除探测剖面中的水平和倾斜同向轴干扰信号；利用地下介质和空气中雷达波速进行偏移处理的资料进行对比解释可以有效提高解释的正确性。
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| 关 键 词： | 探地雷达 空气中回波 水平背景移除 二维滤波 偏移 |
Character of GPR wave in air and processed method |
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| Institution: | SHI Jian-ping, ZHANG Zhi-yong, DENG Ju-zhi (1. Geological Party No. 304, Bureau Geology of Hunan Nuclear Industry, Changsha, Hunan 410003, China; 2. East China Institute of Technology, Fuzhou, Jiangxi 344000, China; 3. China University of Geosciences(Beijing), Beijing 100083, China) |
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| Abstract: | The wave reflected by objects in the air is unavoidable because electromagnetic wave of GPR was send to all directions. There are three air reflection types： directly arrived wave, system ring and reflection wave. The directly arrived waves don＇t disturb the recognition of the reflections from earth because they affect the first short time of GPR trace record. But system ring and reflection from air are the mainly part of disturbs. The time and distance curve of reflection from air can be classified into two types： hyperbola type and line type. The reflection from air and from earth can be recognized by calculating the velocity of electromagnetic wave. Line type reflection can be filtered by background remove and 2-D filter; by comparing the migrated profiles with velocity in air and ground, the interpretation will become more exact. |
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| Keywords: | ground penetrating radar reflection in air background remove 2-D filter migration |
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