Discussion and simulation verification of optical system design method for very high-precision star sensor

Abstract

The star sensor is an important means of satellite on-orbit attitude measurement, and its angle measurement accuracy directly determines the satellite attitude measurement accuracy. The optical system is an important part of the star sensor, and its image quality evaluation method, aberration control and optimization design method are different from the traditional imaging system. Starting from the working principle of the star sensor, this paper analyzes the main factors that affect the accuracy of angle measurement and the imaging characteristics of the energy detection system, and then puts forward the control elements and aberration correction requirements at the lens design level, and finally discusses the difference from the Programming language Method, using various operands provided by optical design software to constrain various aberration. Finally, for an optical system with a focal length of 250mm, an entrance diameter of 125mm, a field of view of 8°, and a spectral range of 400nm to 800nm, the constraint method proposed in this paper is used to optimize the design at the system level, and the finally imaging quality meets the shape of spot, centroid position deviation, enclosed energy, relative distortion, lateral chromatic aberration and other special requirements, and in the temperature range -10℃~40℃, the imaging quality is almost unchanged. The simulation results show that the optimized control method proposed in this paper has important guiding significance for the optical design of the very high-precision star sensor, and it is also suitable for energy detection systems such a point target detection system.