测绘相机在轨空间交会角变化的计算

摘要

This paper researches the calculation method for the change of space intersection angle of a mapping camera, for the change of the angle should be within 5" to ensure the reliability of transmitting data in orbit. First, the temperature field was calculated for high and low temperature operating conditions with the I-deas software. Then, the calculated temperature field was input to a structural model as temperature load to complete the temperature mapping from a temperature model to the structural model, namely, from a simple model to a complex model. The thermal-elastic deformation was calculated and the center of optical element deformation was obtained. Finally, the change of space intersection angle of the mapping camera was calculated in two operating conditions with a self-programming software. The results show that the change of intersection angle is below 5" when the temperature operating condition is changed. It concludes that the calculated method can get the accurate change of intersection angle and the calculated data can benefit to the analysis on the space mapping.%由于测绘相机在轨空间交会角在5″内变化才能保证数据的可靠传输,本文研究了测绘相机交会角变化的计算方法.首先,利用I-deas软件计算了测绘相机在极端高温和低温两种工况下的温度场.然后,将计算得到的温度场作为温度载荷施加给结构模型,实现了由温度网格到结构网格的温度映射,即简单有限元模型到复杂有限元模型温度载荷的映射；计算了测绘相机的热弹性变形,得到了光学元件中心点变形量.最后,利用自编的软件计算了在两种极端温况下正视和后视相机的在轨交会角变化.结果表明,测试相机在高温和低温工况下空间交会角的变化在5″范围内.该计算方法可得到空间相机交会角的变化量,计算数据可为测绘相机光机结构设计和热控方案的制定提供数据保障.