Abstract: In order to meet the design requirements of high-precision and high-dynamics star simulators based on Liquid Crystal on Silicon (LCoS) splicing, the traditional splicing method and correction method were improved and optimized. A method of splitting a polarizing beam into three components was proposed to perform optical splicing. Based on the new splicing structure, a system with large papillary distance, low distortion, and an achromatic lens was designed, and the image quality was evaluated. The impact of aberration on the star position in dynamic star simulator was elaborated. A method to correct the position aberration based on the star simulator optical system was presented in details. Results show that, when an optical system is within a 12°×12° field of view, the relative distortion is less than 0.035%. In addition, when the Nyquist frequency is v= 60 lp/mm, the full field of MTF is no less than 0.8. The new splicing structure can improve the consistency of the contrast ratio between the two pieces of LCoS, and enhance the recognition rate of dynamic star simulator in a dynamic test of the star sensor. The new correction method can improve the accuracy of a star map display. The angular distance error is less than 7? after testing, which is in good agreement with the design requirements.

Key words: LCOS splicing structure, correction method of star angular distance error, optical design