The thermal and mechanical stabilization of the focal plane assembly (FPA) naturally has a magnificent impact on the performance of space camera. Thermal and mechanical features of the proposed FPA are described first. Special attention is paid to the thermo-structure design of the FPA. Then the fitting methods based on singular value decomposition and least square are proposed to use the finite-element analysis results to predict the relative position changes between charge coupled devices under thermal and mechanical load cases. A comprehensive finite-element model of the FPA has been built, and the alignment errors, which were induced thermal and gravity loads, are predicted based on the proposed fitting method. To further prove that the design of FPA meets the mechanical and thermal stability requirements, an optical bench was developed. Meanwhile thermal cycling and vibration test of the three FPAs were performed; the alignment error measurements of the FPAs after each test were also performed. Both the simulation and tests show a good stability of the FPA design under operational and test environments.

中文翻译：

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紧凑型星载焦平面对准误差计算与测量方法

焦平面组件（FPA）的热稳定性和机械稳定性自然会对空间相机的性能产生巨大影响。首先描述所提出的 FPA 的热和机械特性。特别注意FPA的热结构设计。然后提出基于奇异值分解和最小二乘法的拟合方法，利用有限元分析结果预测热和机械载荷情况下电荷耦合器件之间的相对位置变化。建立了 FPA 的综合有限元模型，并基于所提出的拟合方法预测了由热载荷和重力载荷引起的对准误差。为了进一步证明 FPA 的设计满足机械和热稳定性要求，开发了光学平台。同时对三种FPA进行了热循环和振动试验；还进行了每次测试后 FPA 的对准误差测量。仿真和测试均表明 FPA 设计在操作和测试环境下具有良好的稳定性。