视轴角控制误差对航天相机成像质量的影响分析  

Effect of control error of boresight angle on imaging quality of space camera

作　　者：王战[1,2] 韩诚山[1] 李祥之[1] 黄良[1] 姚程[1,2] 

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

出　　处：《应用光学》2015年第1期35-40,共6页Journal of Applied Optics

基　　金：国家自然科学基金(60506014)

摘　　要：为了降低飞行器倾斜成像工作过程中视轴角误差对TDICCD空间相机成像质量的影响,提出满足相机成像质量的视轴角范围及控制误差的要求。根据空间相机成像机理,给出了焦面像移速度以及由视轴角误差引起的像移速度匹配误差计算公式,分析了视轴角对地面像元分辨力的影响。并以调制传递函数(MTF)为约束条件给出了不同积分级数下视轴角的范围。通过实际工程参数计算得出,当视轴角控制误差为0.8°时,满足96级TDICCD成像质量要求的视轴角应不大于12.75°;若要满足96级TDICCD倾斜成像时视轴角达到25°,则视轴角控制误差应优于0.4°。In order to reduce the influence of boresight angle error on the image quality of the time delay integration charge couple device (TDICCD) space camera during the tilted imaging process ,the requirements for the scopes of boresight angle and its control errors were put for‐w ard to meet the image quality of space camera .According to the imaging mechanism of space camera ,the calculation formula of focal plane image motion speed and that of the matching er‐ror of image motion speed caused by boresight angle error were presented ,and the effect of boresight angle on the ground pixel resolution was analyzed .Moreover ,the ranges of boresight angles for different integration degrees were given under the constraints of modulation transfer function (M T F) .From practical calculations ,it is concluded that ,w hen the control error of boresight angle is 0 .8° ,the boresight angle should be less than 12 .75°or if the boresight angle needs to reach 25° ,the control error should be less than 0 .4°to satisfy the quality requirements of TDICCD of which the integration degree is 96 .

关 键 词：空间相机 视轴角 像移速度 调制传递函数 姿态控制 

分 类 号：V445.8[航空宇航科学与技术—飞行器设计]