Abstract: In order to test the tracking ability of star sensor to a starlight at infinity in the laboratory, an optical system is designed to simulate the starlight color temperature at infinity by using a broad spectrum color temperature source through a collimator. In this system, the aperture off-axis method is adopted to avoid the phenomenon of shading ratio of the coaxial system, the paraboloid of the primary mirror makes the image quality of the system better, and the wide spectrum anastigmatism problem of the transmission receiver is solved by combining with the wedge-shaped semi-inverse semi-permeable secondary mirror. The design index requirements are that the working band is 400-900 nm, the entrance pupil diameter is 300 mm, the focal length is 3 150 mm, and the field-of-view angle is 0.05°. The actual test results show that, in the case of the secondary mirror without aspheric surface, the optical system can achieve the index requirements,i.e., the modulation transfer functions of both the reflection end and the transmission end are close to the diffraction limit, the RMS value of wave aberration of each field of view is better than λ /30, and the parallelism of the emitted light is better than 1″.

Key words: starsimulator, opticalsystemdesign, off-axisreflector, paraboloid