一种空间相机偏流角间歇式实时调整方法

摄像时对偏流角实时调整，可以减小空间相机因偏航角姿态变化对成像质量的影响，可以延长一次性连续摄像时间并可以使用较多的TDI积分级数进行摄像。首先，对偏流角实时调整的需求进行详细分析并给出实时调整策略；然后，介绍了偏流调整系统的构成及实时调整的工作原理；最后，提出一种间歇式实时调整方案并进行了实现。实验结果表明：摄像过程中偏流角偏差值可以调整在4.2′以内，调整后误差不大于72.17″，一次调整时间小于1s，偏流角调整过程中图像的MTF值为99.67％。提出的间歇式实时调整方法满足摄像过程中，偏流角实时、长时间调整对图像无本质影响的要求。

One batch type real-time adjusting of drift angle of space camera

Real-time adjusting of drift angle could decrease the influence on image quality caused by attitude change and prolong continuous photography time with more TDI integral progression, when space camera was photographing. First, the requirement on Real-time adjusting of drift angle was analyzed in detail and the real-time adjusting tactic was presented. Then the structure of drift angle adjusting system and the operating principle of real-time adjusting were introduced. Finally, a batch type real-time adjusting method was presented and experimented with it. Experimental results indicate that drift angle partial difference can be adjusted below 4.2′, adjusting error is no larger than 72.17″, adjusting time is less than 1s, MTF is 99.67％ on photographing. It totally satisfies the requirement that real-time and long period adjusting of drift angle is no essential influence on image in the process of photographing.