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- 2018
宽视场遥感相机像移速度模型及补偿策略
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Abstract:
宽视场遥感相机在轨成像期间，受地球自转、卫星颤振、姿态机动等因素影响而产生像移，导致成像质量降低。为此，提出了一种适用于宽视场遥感相机的像移速度模型，并考虑了离轴角对计算精度的影响，推导了离轴三反相机像移速度和偏流角解析式。以某卫星为例，仿真分析了3种典型成像模式下像移速度和偏流角在焦面的分布情况，仿真结果与定性分析结果一致，验证了像移速度模型的正确性。在此基础上，针对侧摆兼具俯仰成像模式，提出了相应的像移补偿策略。补偿效果表明，卫星侧摆35°兼具俯仰35°成像时，采用全局优化偏流角匹配策略能保证整个焦面区域的调制传递函数（modulation transfer function，MTF）均大于0.95（16级）；采用局部优化偏流角匹配策略能保证焦面重点观测目标的MTF大于0.95（96级）；采用提出的像移速度匹配策略在分11组调节行周期情况下，能保证整个焦面区域的MTF均大于0.95（16级）。仿真结果表明，提出的像移补偿策略能有效解决侧摆兼具俯仰成像时的像质下降问题，可为宽视场遥感相机像移补偿提供可靠依据
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