摘要
导航相机是深空探测领域中关键的导航敏感部件,本文通过提高导航相机的灵敏度来提高导航相机的综合性能,特别是提高时间分辨率,解决高动态条件下的目标探测问题。首先,根据导航相机的工作模式和EMCCD的性能特点,分析了影响导航相机成像质量的多个因素,建立了目标信噪比理论分析模型;然后,在理论计算基础上,重点研究EMCCD导航相机的样机设计技术,说明了EMCCD高频高幅驱动、模拟前端设计、TEC真空制冷、时序控制与数据处理等关键技术的实现方法;最后,介绍了相关实验工作,并分析实验数据。实验结果表明:样机最大目标信噪比在倍增增益M=10时达到68.6dB,在口径13mm条件下,可在积分时间1ms内实现对月球成像。基本满足深空探测导航相机高动态条件下短积分时间成像的要求。
The navigation camera is a sensitive component that is crucial for deep space exploration.This report describes a method for the comprehensive improvement of the performance of such a camera by increasing their sensitivity.In particular,the approach improves the temporal resolution of this instrument and simultaneously solves the target detection problem under high dynamic conditions.Firstly,the imaging quality of a navigation camera is analyzed according to the operating mode and the performance characteristics of an Electron Multiplying Charge-Coupled Device(EMCCD).In addition,a theoretical model of a target's signal-to-noise ratio(SNR)is established.Secondly,the study focused on the design method for an EMCCD navigation camera.Key technologies are illustrated such as the high-frequency high-amplitude drive circuit of an EMCCD,analog front circuitry,TEC vacuum cooling,timing control,and data processing.Finally,the experimental results show that the optimal target SNR is 68.6 dB at M=10 and that the moon can be imaged using an integration time of 1 ms with a 13 mm aperture.The navigation camera satisfies the requirements of short integration time imaging under the high dynamic conditions associated with deep space exploration.
作者
何家维
何昕
魏仲慧
穆治亚
李方彪
HE Jia-wei;HE Xin;WEI Zhong-hui;MU Zhi-ya;LI Fang-biao(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2018年第12期3019-3027,共9页
Optics and Precision Engineering
基金
中国科学院知识创新工程领域前沿项目资助~~
关键词
深空探测
导航相机
电子倍增电荷耦合器件
高动态
小天体
deep-space exploration
navigation camera
Electron-Multiplying Charge-coupled Device(EMCCD)
high dynamic
small celestial bodies
