基于地面激光的探地雷达图像地形校正方法

发布时间：2018-07-21 19:34

【摘要】：为消除地形起伏对探地雷达图像畸变和解译的影响,需进行地形校正处理。本文主要通过地面激光建立的数字高程模型(Digital Elevation Model,DEM)来实现探地雷达图像的地形校正。首先,利用激光点云构建高精度DEM,借助靶球标记的雷达测线起始和结束位置实现雷达图像与DEM上提取出相应的二维地形剖面之间的匹配。然后,选择测线上最高点所在的水平面为参考基准面,根据时间移位原理并结合线性插值法对雷达图像上各道数据的双程传播时间进行校正;最后,选择实例数据并以差分GPS采集的地形数据为标准,着重分析了不同分辨率DEM下提取出的地形剖面对地形校正效果的影响。结果表明利用激光点云建立DEM实现探地雷达图像地形校正的有效性,当DEM分辨率与探地雷达数据采集道间距相一致时,从DEM上提取出的地形剖面实现探地雷达图像地形校正的效果最佳。
[Abstract]:In order to eliminate the influence of terrain fluctuation on the distortion and interpretation of GPR images, topographic correction is needed. In this paper, the terrain correction of ground penetrating radar image is realized by digital elevation model Dem (Digital elevation Model Dem) established by ground laser. Firstly, the laser point cloud is used to construct the high precision DEM, and the matching between the radar image and the corresponding 2D terrain profile is realized by using the starting and ending position of the radar line marked by the target ball. Then, the horizontal plane of the highest point on the measuring line is selected as the reference datum. According to the principle of time shift and the linear interpolation method, the two-way propagation time of each channel data on the radar image is corrected. Taking the topographic data collected by differential GPS as the standard, the influence of the topographic profile extracted from Dem with different resolutions on the topographic correction effect is analyzed. The results show that using laser point cloud to establish Dem is effective for terrain correction of GPR images. When the Dem resolution is consistent with the GPR data acquisition channel spacing, The terrain section extracted from Dem has the best effect for terrain correction of ground penetrating radar image.
【作者单位】：河南工程学院煤化工资源综合利用与污染治理河南省工程实验室;首都师范大学资源环境与旅游学院;河南工程学院资源环境与特色旅游研究中心;
【基金】：中国地质调查局地质调查工作项目(No.12120114002101,No.DD20160268) 河南工程学院博士基金项目(No.D2016004) 煤化工资源综合利用与污染治理河南省工程实验室开放基金资助项目(No.502002-B01)资助
【分类号】：P631.3

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