当光学系统口径一定时，在相同的轨道高度条件下，增大焦距可以提高地面分辨率，增大系统的视场角可以扩大对地面的覆盖宽度。

When the aperture diameter of an optical system is fixed with the same orbit height, the resolution of ground objects can be improved by increasing the focal length.

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当光学系统口径一定时，在相同的轨道高度条件下，增大焦距可以提高地面分辨率，增大系统的视场角可以扩大对地面的覆盖宽度。

When the aperture diameter of an optical system is fixed with the same orbit height, the resolution of ground objects can be improved by increasing the focal length.

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