惯性空间TDI相机长弧段星源主动扫描设计  

Design of inertial space TDI camera for long arc active star source scanning

作　　者：闫安东 付宗强 曾疏桐 常琳[1,3] 杨秀彬[1,3] YAN Andong;FU Zongqiang;ZENG Shutong;CHANG Lin;YANG Xiubin(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;University of Chinese Academy of Sciences,Beijing 100039,China;Key Laboratory of Space-based Dynamic&Rapid Optical Imaging Technology,Chinese Academy of Sciences,Changchun 130033,China;School of Physics,Shandong University,Jinan 250100,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院大学,北京100039 [3]中国科学院天基动态快速光学成像技术重点实验室,吉林长春130033 [4]山东大学物理学院,山东济南250100

出　　处：《光学精密工程》2024年第11期1686-1700,共15页Optics and Precision Engineering

基　　金：吉林省自然科学基金资助项目(No.20210101099JC)。

摘　　要：为了有效扩大惯性空间观测的幅宽范围和成像信噪比,提出了一种基于星等与光学多参量的映射函数的卫星与载荷姿频协同补偿的TDI相机长弧段星源主动扫描设计方法。首先,基于黑体辐射能量密度公式,构造TDI光学参量与极限探测星等之间的映射函数;然后,采用齐次坐标变换和欧拉轴最优路径规划方法,建立惯性空间卫星恒速机动和载荷动态实时补偿的长弧段星源扫描成像模型,完成动态星源无拖尾高信噪比成像。最后,基于平行实验理论,搭建由TDI相机和动态星源模拟器组成的实验系统,并完成了扫描成像实验和误差分析。实验结果表明,本体坐标系相对惯性坐标系的欧拉角速率为8.5(°)/s时,积分级数为96,TDI相机行频为1 kHz,成像时长10 s,TDI相机成像过程中星图成像信噪比最大值为7.325,扫描区域立体角为5.4232 rad。惯性空间TDI相机长弧段星源主动扫描可实现对星源高信噪比成像,并大幅拓展了成像观测范围。To effectively enhance the bandwidth range and imaging signal-to-noise ratio for inertial space observation,we propose a design method for the active scanning of long arc star sources using TDI cameras,based on the mapping function of star magnitude and optical multi-parameters.First,we construct a mapping function between TDI optical parameters and the limit detection star magnitude,grounded in the blackbody radiation energy density formula.Next,employing homogeneous coordinate transformation and the Euler axis optimal path planning method,we establish an imaging model for dynamic star source scanning with continuous compensation of inertial space satellites and payload.This achieves high signal-to-noise ratio imaging of dynamic star sources without tailing.Finally,leveraging the theory of parallel experiments,we build an experimental system consisting of a TDI camera and a dynamic star source simulator,conducting scanning imaging experiments and error analysis.Experimental results indicate that when the Euler angular rate of the body coordinate system relative to the inertial coordinate system is 8.5(°)/s,the integration series is 96,the row frequency of the TDI camera is 1 kHz,and the imaging duration is 10 s,the imaging signal-to-noise ratio of the star map reaches a maximum of 7.325,and the solid angle of the scanning area is 5.4232.The active scanning of long arc star sources by the inertial space TDI camera can achieve high signal-to-noise ratio imaging of star sources and significantly expand the observation range of imaging.

关 键 词：空间遥感 TDI相机 信噪比 长弧段 欧拉轴 主动扫描 

分 类 号：TP394.1[自动化与计算机技术—计算机应用技术] TH691.9[自动化与计算机技术—计算机科学与技术]