飞船振动引起的空间相机像移模型分析

Space Camera Image Motion Model Analysis Caused by Spacecraft Vibration

为了对由飞船振动引起的空间相机像移随时间变化规律进行分析,在NASA对Landsat-4卫星平台振动在轨测试结果的基础之上,提出了连续谱及各级非严格整数倍频谐波线性相加的焦面干扰力功率谱模型,推导出了相应的焦面干扰力时域模型,依据刚体运动学原理,建立了连续谱分量和各级非严格整数倍频谐波的线性相加的空间相机焦面像移模型。实验证明了由飞船振动引起的像移模型的正确性。

In order to analyze space camera image motion change regulation with time caused by the spacecraft vibration, based on the NASA Landsat-4 satellite platform vibration test results on orbit, focal plane disturbance force model which is a linear combination of continuous spectrum and harmonics of nonstrictly integral multiple of fundamental frequency is proposed. The corresponding domain model of focal plane disturbance force is deduced, based on rigid body kinematics, space camera focal plane image motion model of linear combination of continuous spectrum and harmonics of nonstrictly integral multiple of fundamental frequency is established. Experiment proved the correctness of the image motion model caused by spacecraft vibration.