Nowadays the remote sensing instruments require relatively larger FOV and higher LOS pointing accuracy. However, the
traditional scanning model can only have a relatively small scanning area. As the scanning area increases, the image
rotation will increase rapidly. The traditional two-dimensional scanning model has failed to meet the growing demands
of remote sensing instruments. To solve the problem, in this paper, the differences of all kinds of two-dimensional
scanning method are analyzed and compared, and different ways to place and rotate two-dimensional scanning mirror are
also considered. Finally, through analysis, a kind of two-dimensional scanning model which meets the large area
two-dimensional scanning requirements was obtained. At the same time, the image rotation of large area
two-dimensional scanning model is analyzed, which provides data support for image processing.
This paper analyzed the structural and imaging features of off-axis three-mirror system, discussed the design method of
the multi-channel off-axis three-mirror system. A new three-channel off-axis TMA optical system was designed using
channel spectral separation. The system parameters are as follows: aperture is 300mm, FOV is 2°×2°, covering three
spectral bands. According to the primary aberration theory, an appropriate initial configuration can be obtained. By
optimizing the initial configuration, we can get an optical system which meets the imaging quality requirement. The
design of relay lenses was also considered, the ultimate goal is to complete the design of each channel with the least
number of lens.
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