行星光学远程着陆模拟器光学系统设计

Optical system design of simulator for autonomous landing on planets based on optical navigation

为了实现对行星光学远程着陆过程的光学模拟以及满足行星光学远程着陆系统导航算法的地面测试需求,提出了以商用投影仪显示系统为基础的模拟器光学系统方案,重点阐述了系统的光学设计思想,并给出了设计结果。首先,介绍了模拟器的工作原理和系统组成,在此基础上,由技术要求及所选择的投影仪和CCD参数确定了投影镜头和成像镜头的光学系统指标,最后给出了投影镜头、成像镜头及系统对接的光学结构图,像差曲线、点列图和MTF曲线图。仿真分析结果表明:系统的点列图中的弥散斑对称性都很好,有利于模拟器系统的后续图像处理和判读,同时系统在Nyquist频率(91 lp/mm)处的MTF设计值接近0.6,系统整体成像性能良好。设计结果可作为研制行星光学远程着陆模拟器系统的基础。

In order to realize the simulation of autonomous landing on planets based on optical navigation and to satisfy the need of ground-based testing for system navigation algorithms, a scheme of simulator based on commercial projector＇s projection system is suggested. The idea of optical system design are described espe- cially and the design results are given. First, the working principle and components of system are introduced. Then the optical specifications of projective lens and imaging lens are fixed based on the simulator＇s technology demands, projector and CCD selected. Finally, the optical system layouts, aberration curves, spot diagrams and modulation transfer functions （MTF） are showed. Simulation results indicate that the symmetry of spot dia- grams is well to satisfy the demand of image processing and judgments, and the design value of MTF is close to 0.6 at the Nyquist frequency（91 lp/mm） and the imaging performance of system is good. The design results can be used for the following manufacture of simulator for autonomous landing on planets based on optical naivgation.