2D有限差分偏移技术在探地雷达信号成像中的应用

Ground penetrating radar data imaging via the 2D finite-diffrence migration method

摘要: 由于绕射波的存在,很难准确估计探地雷达剖面中目标的尺寸,因此,对目标进行成像研究具有重要意义和应用价值。采用2D有限差分偏移技术对典型的合成记录及实测探地雷达剖面进行了成像处理,结果表明,偏移可以大大提高探地雷达资料的横向分辨率。在实际资料处理中,通过对点目标绕射波的准确归位,可以简单估计地下介质的电磁波速度。讨论了工程处理中速度模型的建立,实际数据的非零偏等偏移处理中的核心问题。

Abstract: Due to the interference of diffraction waves,the position and shape of detects can not be easily interpreted.Therefore migration is very important for ground penetrating radar(GPR) data processing.The synthetic and filed GPR data are processed by the 2D finite-diffrence migration method.The study results indicated that compared to the GPR data,the spatial resolution is increased obviously using the migration method.When the diffraction energy is efficiently focused on defects,the electromagnetic wave veloctity underground can be estimated in filed GPR data.Some factors,such as velocity moded,real offset section which effect the GPR migration results are mentioned.