| SAR影像几何校正 |
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| 引用本文： | 张永红,林宗坚,张继贤,甘梦龙.SAR影像几何校正[J].测绘学报,2002,31(2):134-138. |
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| 作者姓名： | 张永红 林宗坚 张继贤 甘梦龙 |
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| 作者单位： | 1. 中国测绘科学研究院,北京,100039
2. 湖南衡阳市国土管理局,湖南,衡阳,421001 |
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| 摘 要： | SAR影像的几何校正是阻碍其应用的瓶颈问题，目前所用的方法都有其局限性。介绍描述SAR构像几何的坐标系统及距离－多普勒方程，同时，介绍卫星轨道及描述卫星轨道的参数。为提高几何校正的精度，提出一种由几个离散点的值内插整个弧段上卫星状态向量的轨道模拟算法。在此基础上，给出利用DEM进行SAR影像几何校正的方法。该方法以时间参数为自变量，迭代解算距离－多普勒方程，计算DEM中点每一点对应的影像坐标，最后进行了实验与讨论。
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| 关 键 词： | SAR影像 合成孔径雷达影像 距离－多普勒方程 轨道参数 几何校正 多普勒频率 遥感图像 |
| 文章编号： | 1001-1595(2002)02-0134-05 |
Geometric Rectification of SAR Images |
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| ZHANG Yong-hong ,LIN Zong-jian ,ZHANG Ji-xian ,GAN Meng-long.Geometric Rectification of SAR Images[J].Acta Geodaetica et Cartographica Sinica,2002,31(2):134-138. |
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| Authors: | ZHANG Yong-hong LIN Zong-jian ZHANG Ji-xian GAN Meng-long |
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| Institution: | ZHANG Yong-hong 1,LIN Zong-jian 1,ZHANG Ji-xian 1,GAN Meng-long 2 |
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| Abstract: | The difficulties in geometric rectification of SAR images have hampered their applicability. Currently used rectification algorithms are not satisfying. The Range-Doppler equations which describing the SAR image geometry and related space coordinate system are presented, as well as satellite orbit and orbit parameter. An orbit modeling formula is proposed, through which one can interpolate the satellite state vector on the whole orbit arc with a high precision by means of ephemeris data. Then a rectification algorithm of SAR images is given. The algorithm calculates the corresponding pixel position of every three-dimension DEM point through iteratively solving the Range-Doppler equations. Finally, a test on the proposed algorithm is given. |
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| Keywords: | Synthetic Aperture Radar images Range-Doppler equations orbit parameters geometric rectification Doppler frequency |
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