摘要
探地雷达发射的电磁波在整个空间中传播,不可避免存在空气中回波。空气中回波可分为三种:直达波、系统振铃及反射回波。其中,直达波由于集中在探地雷达记录最初的很小时间段,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,一般有二种形式:双曲线型和线型。可以通过计算介质中电磁波的波速,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。
The reflection wave in air is unavoidable because electromagnetic wave of GPR is send to all directions in air.The reflection wave sent to air will be received by antenna,there are three types:directly arrived,system ring,reflection.The directly arrived waves don't disturb to recognize the reflections from earth because they appear the first short time period of GPR trace record.But system ring and reflection from air are the most disturbs.The time and distance curve of reflection wave from air can be divided into two types:hyperbola type and line type.The reflection from air and from earth can be recognized by calculate the velocity of electromagnetic.
出处
《物探化探计算技术》
CAS
CSCD
2009年第5期437-441,共5页
Computing Techniques For Geophysical and Geochemical Exploration
基金
国际科技合作资助(2007DFA20790)
关键词
探地雷达
空气中回波
滤波
ground penetrating radar
reflection in air
filter
