A Theoretical Method for Vanes Profile Design in Star Sensor Baffle

摘要

All the star trackers must be composed of a baffle system to removes stray lights intensity. According to the mission, some external sources can illuminate the optical system and introduce some noises in the final image. The performance of a star tracker is often limited by the stray light level on the detector. Some familiar formulas for baffle system design that have already been introduced are somewhat useless due to some fundamental problems. In this paper, a complete analytical method is developed to fully design a two-stage baffle system. Furthermore, some new relationships are introduced to determine vane positions and heights. Finally, ray tracing performance analyses are performed to prove the formulation. The designed baffle simulations reveal that the attenuation factors are on the order of 10~9 for angles larger than the pre-defined exclusion angle.