空间相机离轴角引起的积分时间误差分析  

Analysis of Integral Time Caused by Off-axis Angle for Space Camera

作　　者：董小静[1] 曹启鹏[1] 韩杏子[1] 朱军[1] 

机构地区：[1]航天东方红卫星有限公司,北京100094

出　　处：《航天返回与遥感》2013年第4期52-58,共7页Spacecraft Recovery & Remote Sensing

摘　　要：光学遥感卫星中空间相机常用的离轴三反光学系统,离轴三反系统能扩大光学系统视场、提高系统调制传递函数(MTF),但是离轴角会带来积分时间不同步的问题,文章对离轴角引起的积分时间不同步而产生的成像品质影响进行了分析。首先对离轴三反光学系统的离轴角建立数学模型后,应用STK软件仿真空间TDICCD相机在不同级数下离轴角带来的摄影点积分时间和星下点积分时间的差异,然后用Matlab编写程序处理得到的不同积分时间的采样点得出结论,离轴角越大,光学系统的传递函数越小,光学相机成像品质越差。在工程应用中,对一个确定离轴角的离轴三反光学系统,通过仿真,对积分时间调整给出了相应设计建议。This paper introduces the off-axis reflcction system of camera of optical remote sensing satel- lite, the off-axis reflcction system can expand the optical system field of view and improve MTF. But the off-axis angle brings the Problem that integral time is not synchronized. This paper analyzes the factors on asynchrony of integral time of off-axis reflection system for camera. First, a mathematical model of the off-axis angle is set up. Use STK software to simulate the integral time caused by the off-axis. And then use Matlab pro- gramming to deal with sampling points. The conclusion is that the larger the off-axis angle is, the smaller the transfer function of the optical system is, and the poorer the quality of the optical imaging. For engineering ap- plication, the paper offers design proposals for adjusting the integral time at the same time.

关 键 词：时间延迟积分电荷耦合器件 离轴角 积分时间 误差分析 空间相机 

分 类 号：O433.1[机械工程—光学工程]