Abstract: Star tracker (ST) is a sensor with high accuracy, which is wildly applied to measure the attitude of spacecraft. The accuracy of a ST can be easily influenced by the outer environment, especially by the temperature environment. Since the heat stability is important for the accuracy of ST, an optimal design method for the baffle based on Bipod structure is presented to improve the heat stability. Through FEA simulation, this design is proved to be effective in intensity and rigidity, and greatly improved the heat stability, and enhances the stability of optical axis directing accuracy while the ST is working in orbit.

Key words: star tracker, Bipod structure, optimum design