基于CMOS APS的星敏感器光学系统结构设计与优化

Design and optimization of the optical system of the star sensor based on CMOS APS

基于CMOSAPS的星敏感器是适应航天技术微型化的发展而产生的新一代姿态敏感器。结合星敏感器系统帧频以及探测信噪比阈值的要求,确定了合适的CMOS探测器件以及光学系统的通光孔径、焦距、工作光谱范围和中心波长等主要参数。分别基于球面和非球面,在ZEMAX平台上实现了具有良好像质的大孔径(F/1.198)、大视场(22.6°)、宽光谱范围(0.5～0.8μm)的两种光学系统的结构设计,满足了对弥散斑、能量集中度、畸变等的特殊要求。

The star sensor based on CMOS APS is a new kind of attitude sensor generated to meet the development of miniaturization in space technology. Appropriate CMOS detector and optical system primary parameters, such as the aperture, focal length, spectral range, primary wavelength and so on, were determined according to the frame frequency requirement of the star sensor as well as the threshold of the detecting signal-to-noise ratio. Two kinds of optical structures with large aperture（F/1.198）, wide field of view（22.6°）, wide spectral range（0.5μm-0.8μm） and good imaging quality, respectively based on spherical and aspheric surfaces, were both achieved on the stage of ZEMAX software. And the especial requirements of the spot, energy concentration, distortion etc. were all satisfied.