机载探地雷达的进展以及数值模拟

机载探地雷达可能解决危险环境或广域条件下的近地表探测问题,用于解决环境、生态或军事方面的问题.然而由于种种原因,该技术的发展却显得比较慢.为了推进该技术的发展,本文介绍了目前世界范围内机载探地雷达的进展,并利用时间域有限差分法对一些典型模型进行数值模拟,并用特定的偏移成像方法对模拟结果进行成像.目前存在的机载探地雷达主要有三种类型:第一种为将常规探地雷达天线悬挂在直升飞机上,第二种为针对机载探地雷达开发的雷达系统,第三种为具有探地能力的合成孔径雷达.数值模拟结果表明,不管是水平地面的情况下,还是起伏界面的情况下,机载探地雷达都能清楚探测一定深度范围内的地下目标.可见,机载探地雷达是存满希望的一种方法.

Advances and numerical simulation of airborne ground penetrating radar

Airborne ground penetrating radar(GPR) is a potential tool for near-surface detection in dangerous and regional areas;it can be used for environmental and ecological evaluation,or military purpose.This technique is slow due to kinds of reasons.To promote the development of the technique,this paper introduces the advance of the technique worldly,and simulates the airborne GPR detection for typical near-surface models,the simulated data are imaged with special migration method.It is shown that current airborne GPR can be classified into three types.The first suspend conventional commercial GPR antennas and control unit under a helicopter.The second type is fabricated for airborne survey,and has special hardware and system.The third type is synthetic aperture radar with penetrating capability.It is shown that the targets under both the flat ground surface and the rough surface can be imaged clearly.It is concluded that air-borne GPR is a potential tool for subsurface measurement will receive more attention in the future.