中文摘要：

为了提高TDI- CCD高分辨率空间相机离焦补偿的可靠性，保证相机的图像质量，提出一种多功能调焦控制系统。首先，详细分析离焦补偿的需求，提出位置闭环、温度闭环、图像闭环和位置开环四种调焦方法；然后，介绍系统的构成及工作原理；最后，对四种调焦方法进行设计和实验验证。实验结果表明：位置闭环调焦控制误差不大于1.3μm，温度闭环调焦控制误差不大于1.4μm，图像闭环调焦控制误差不大于2.3μm，位置开环调焦控制误差不大于3.4μm，四种调焦方法的控制误差满足系统设计要求，有效地提高了TDI- CCD高分辨率空间相机离焦补偿的可靠性。

英文摘要：

In order to improve the reliability of defocus compensation and guarantee the imaging quality for TDI- CCD high resolution space camera, a multi-function focus control system was proposed. Firstly, the system requirements were analyzed in detail and four focus control methods were proposed and the four focus control methods contained position closed loop, temperature closed loop, image closed loop and position open loop. Secondly, the system composition and work principle were introduced. Finally, the four focus control methods were designed and validated. Experimental results indicated that the error of position closed loop was not more than 1.3 μm, the error of temperature closed loop was not more than 1.4 μm, the error of image closed loop was not more than 2.3 μm, the error of position open loop was not more than 3.4 μm, the errors of four focus control methods satisfied the requirements of system design and the reliability of defocus compensation was improved effectively.