基于模拟成像点的星载SAR图像校正及精度研究

The Rectification and Precision Research of Satellite SAR Image Based on Simulated Imaging Point

随着星载SAR的发展以及SAR图像应用的深入,对星载SAR图像进行几何校正从而实现精确定位也越来越重要。结合已有的两类校正方法,提出了用GCP点模拟成像点来校正星载SAR图像的算法。重点描述了模拟GCP成像点的原理、映射模型的建立及算法步骤,并与其它两类方法在算法流程上作了分析、比较。最后用实际Radarsat图像作了试验以分析这种方法的精度,并给出结论。

With the development of satellite SAR. and wide application of SAR image, the geometric rectification of satellite SAR image becomes more and more important in order to locate it accurately. A new algorithm based on simulated imaging point is presented in this paper through combining two exiting rectification algorithms. The paper describes the theory, establishment of mapping model and realization steps of the new algorithm, and makes a comparison with two other algorithms of their flow chart. Finally, the precision is evaluated with a test on real RADARSAT image, and some conclusions are given.