北京一号小卫星几何纠正方法与试验

Method and Experiments for Geometric Rectification of Beijing-1 Satellite

针对北京一号卫星传感器成像技术特点,在相应的共线方程成像模型基础上,设计了详细的几何纠正流程。该流程包含外方位元素求解和影像重采样两个步骤。在外方位元素求解方面,提出了一种求解外方位元素初始值的计算方法;在影像重采样方面,本文提出了一种求解影像行的迭代方法。最后用本文提出的几何纠正流程对一幅北京一号小卫星影像进行纠正实验,并与传统的多项式纠正进行了精度比较分析,得出本文方法比多项式纠正精度高而且可以消除由于高程引起的投影差。

Aiming at the characteristics of Beijing-1 satellite imaging technology, a detailed geometric rectification process has been designed in accordance strictly with the imaging model. The process includes two steps ： solving the exterior orientation elements and image resampling. In order to solve the exterior orientation elements of image, the paper proposes an algorithm to set initial value. This paper proposes an iterative method to solve the image line at image resampling. Finally, a calibration experiment of Beijing-1 small satellite image is conducted by using the geo rectification process proposed in this paper. The results show that this method has a higher precision compared to the polynomial rectification and it can eliminate the height displacement.