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为了提高大视场空间相机物距、投射角、地面像元分辨率、幅宽等几何参数的计算精度,研究了星下点成像与侧摆成像时上述几何参数的精确计算方法。在全面考虑地球曲率和投射角的基础上,建立了相应的几何模型,改进了大视场空间相机几何参数计算方法。根据仿真分析,对于轨道高度650 km、半视场40°的空间相机,当侧摆20°时,垂直线阵方向像元分辨率的最大值是最小值的2.31倍,是传统计算方法的1.78倍;平行线阵方向像元分辨率的最大值是最小值的7.16倍,是传统计算方法的4.29倍;幅宽是传统计算方法的1.33倍。因此,传统计算方法存在较大的误差,提出的精确计算方法对于提高大视场空间相机成像质量具有重要意义。
In order to improve the computational accuracy of geometrical parameters such as object distance, projection angle, resolution of terrestrial pixels, width and other geometrical parameters in large field of view space, the precise calculation method of geometrical parameters in under-satellite imaging and side-swing imaging was studied. Based on the comprehensive consideration of the curvature of the earth and the projection angle, a corresponding geometric model is established and the calculation method of geometrical parameters of a large-field space camera is improved. According to the simulation analysis, for a space camera with a track height of 650 km and a half field of view of 40 °, the maximum pixel resolution in the vertical line direction when the roll is 20 ° is 2.31 times the minimum value, which is 1.78 of the traditional calculation method The maximum of pixel resolution in parallel linear array is 7.16 times the minimum, which is 4.29 times that of the traditional calculation method. The width is 1.33 times of the traditional calculation method. Therefore, the traditional calculation method has a big error, and the proposed accurate calculation method is of great significance for improving the imaging quality of a large-field space camera.