Optical system of star sensor with miniaturization and wide spectral band

star sensors is the key measurement equipment for autonomous attitude navigation of spacecraft. Due to the large volume and mass of the traditional star sensor, it is difficult to meet the application requirements of micro-nano satellites. The optical system is the core and bottleneck technology of star sensor miniaturization. The optical system parameter requirements of star sensor for all-sky star identification were studied and analyzed, and a micro-miniature, wide spectral band and transmission-type optical system design based on the spherical lens was proposed. The optical system has the focal length of 40 mm, the field angle of 26.4°, the relative aperture F of 2.8, and the spectral range of 450 nm～1000 nm.The volume and mass of the optical system are greatly reduced, which is suitable for the micro-nano satellites star sensor.

Conclusion

A wide spectral band star sensor optical system based on global lens is designed to meet the requirements of the optical system in micro/nano satellite star sensors. The system has a focal length of 40 mm, a field of view angle of 26.4 °, a relative aperture of F/2.8, and an imaging spectral range of 450 nm to 1000 nm. It has advantages such as large field of view, wide spectral band, extremely low distortion, and telecentric optical path. In terms of design methods, the front and middle groups adopt a weak light power combination structure similar to the low magnification Galileo telescope, and three conventional glass combinations are used to correct color differences in the wide spectral range of the large field of view. Compared to the current wide spectral range and large field of view star sensor optical system with a front diaphragm, the detection spectral width has been increased from 300 nm to 550 nnm, effectively reducing the detection aperture, volume, and quality of the optical system. The design and development results of the lens indicate that the imaging quality of the star sensor lens is good and meets the application requirements.