| IMU/DGPS系统辅助ADS40三线阵影像的区域网平差 |
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| 引用本文： | 鄢建国,李斐,平劲松.IMU/DGPS系统辅助ADS40三线阵影像的区域网平差[J].测绘学报,2009,38(1):0-11. |
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| 作者姓名： | 鄢建国 李斐 平劲松 |
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| 摘 要： | 推导了ADS40航带间外方位元素归一化处理的数学公式，设计了一种描述IMU/DGPS系统误差的数学模型，采用改进的定向片内插模型实现了ADS40影像的区域网平差。试验结果表明，仅需一个地面控制点，IMU/DGPS数据的定位精度就可显著提高，在四角布设地面控制点的情况下，IMU/DGPS数据与ADS40影像的联合平差可得到优于1.5个像素的3维定位精度；构架航线对平差结果的改善作用有限，在作业中采用的必要性不大。
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Study of the Geometric Calibration Method for Airborne SAR Image without DEM |
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| Abstract: | A set of geometric calibration method for airborne SAR image based on prior conditions was proposed, which is independent of DEM and could applied to the complex environment in airplane with uncertainty factors. First, different calibration algorithms were analyzed and unified according to the SAR imaging theory and the geometric distortion course; and then, necessary conditions for precise correction algorithm based on the determinate model were studied, and a calibration algorithm based on the statistic model was put forward when essential conditions could not be satisfied; subsequently, a decision model of calibration scheme was proposed on the basis of different prior conditions. Experimental results of calibration algorithms and fidelity evaluations based on region registration show the validity of the method proposed here. |
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