天绘一号卫星高分辨、多光谱相机与三线阵正视相机夹角在轨标定方法研究

通过对天绘一号卫星摄影原理的分析,建立了在轨标定高分辨、多光谱相机与三线阵正视相机夹角的几何模型,并利用天绘卫星影像数据进行了相关试验。试验结果表明:该方法可行,精度较高,与可供参考的地面实验室定标结果较为接近,高分辨相机与三线阵正视相机夹角标定的两种结果相差1'左右,多光谱相机与三线阵正视相机夹角标定的两种结果相差5'左右。同时,计算分析了卫星定轨误差和地面控制点精度对夹角的影响。该方法模型简单,易于理解,解决了目前天绘一号卫星高分辨、多光谱相机与三线阵正视相机夹角仅有地面实验室标定结果,缺乏有效在轨标定方法的问题,对于影像的融合、纠正及高级产品的生产具有重要意义。

Research on method for the in-flight calibration of mapping satellite- 1 high-resolution camera,multispectral camera and three-line-array nadir camera's intersection angle

Through the analysis of Mapping Satellite-1's photographic principle, geometric model was established to calibrate the intersection angle of the high-resolution, multispectral camera and three-line-array nadir camera in flight. And the correlative experiments using the image data of Mapping Satellite-1 were carried out. Result proves the method's feasibility and high precision, and is close to the referenced result calibrated in laboratory on ground. Results'difference of the intersection angle of high-resolution and three-line-array nadir camera is about 1', multispectral and three-line-array nadir camera is about 5'. Meanwhile, the effect of the orbit determination error and the ground control points'precision on the camera's intersection angle is calculated and analyzed. The method is easily understood, and solves the problem that at present the intersection angle of Mapping Satellite-1's high-resolution, multispectral camera and three-line-array nadir camera is only calibrated in laboratory on ground, cannot be accurately calibrated in-flight. It plays an important role in image fusion, rectification and advanced products' producing.