为提高资源一号02C卫星全色影像几何精度,首先从其严格几何成像模型出发,对成像过程中的几何误差来源及其特性进行分析,在此基础上构建资源一号02C卫星全色相机的在轨几何定标模型;然后,将待定标参数分为内外定标参数,采用分步迭代策略进行解算;最后,基于本文的定标模型及解算方法,利用嵩山定标场提供的高精度参考数据对其进行了在轨几何定标实验。实验结果表明,本文的定标模型及解算方法合理有效,能显著提高资源一号02C卫星全色影像的无控定位精度和有控定位精度;同时,内定标精度优于0.3个像元。

In this paper, we present an on-orbit geometric calibration method for a ZY-1 02C panchromatic camera in order to improve the geometric precision of its images. First, starting from a rigorous geometric imaging model, the source and character of geometric errors are analyzed, and on this basis, the on-orbit geometric calibration model is then set up. Second, the calibration parameters are partially calculated with an iterative strategy by dividing them into two groups: external and internal calibration parameters. Finally, base on the model and proposed method, an on-orbit geometric calibration experiment for a ZY-1 02C panchromatic camera is conducted using the reference data of Songshan Calibration Test Site. The results indicate that the on-orbit geometric calibration model and method are feasible and have high accuracy and reliability, which can significantly improve the positioning accuracy of ZY-1 02C panchromatic images with and without ground control. Moreover, the precision of the internal calibration is better than 0.3 pixels.