H波段折反式星敏感器光学系统设计

Optical System Design of H-Band Catadioptric Star Tracker

面向短波红外星敏感器在机载平台、弹载平台以及舰载平台的应用需求,设计了H波段折反式星敏感器光学系统。该折反式镜头总长为232mm、焦距为704.3mm、全视场为2°、F数为3.9、探测极限星等为6。结果表明:调制传递函数值接近衍射极限,在奈奎斯特采样频率处大于0.5;各视场径向能量趋于一致,弥散斑可覆盖2~3像元;相对畸变小于0.1%,满足指标要求,可为近地空间短波红外星敏感器的工程应用提供理论基础与技术支持。

The optical system of the H-band catadioptric star tracker is designed for application on airborne,missile,and ship-borne platforms.The total length of the catadioptric lens is 232mm,the focal length is 704.3mm,the whole field of view is 2°,the F-number is 3.9,and the detection limit magnitude is 6.The results show that the value of the modulation transfer function is close to the diffraction limit and is more significant than 0.5 at Nyquist frequency.The radial energy of each field of view is consistent,and the dispersing speckle can cover 2~3 pixels.The relative distortion is less than 0.1%,which meets the index.This paper can provide a theoretical basis and technical support for the engineering application of short wavelength infrared star trackers in near-earth space.