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近年来,合成孔径雷达(SAR)技术已取得巨大进步,人们也越来越重视其潜在的应用前景。但是,雷达侧视成像性质和地形起伏的影响导致SAR图像的几何畸变非常复杂,大大影响了SAR图像的应用。几何精校正是SAR图像广泛应用的前提,但是校正过程中需要大量地面控制点(GCPs),以往的人工选点方法费时费力。本文提出了一种基于控制点自动匹配的控制点选点方法,用以提高点位精度和工作效率。该方法包括纠正区域GCP库的建立和GCP图像片的自动匹配。试验结果表明,该方法具有较好的应用价值。
In recent years, Synthetic Aperture Radar (SAR) technology has made great strides, and people pay more and more attention to its potential application prospects. However, the effects of radar side-view imaging and topographic relief cause the geometric distortion of SAR images to be very complicated, which greatly affects the application of SAR images. Geometric rectification is a prerequisite for the wide application of SAR images. However, a large number of ground control points (GCPs) are needed in the calibration process. The conventional manual point selection method takes time and effort. In this paper, a control point selection method based on the automatic matching of control points is proposed to improve the accuracy of point location and work efficiency. The method includes correcting the establishment of the regional GCP library and the automatic matching of GCP image slices. The experimental results show that this method has good application value.