Furthermore, the reasons that the error was produced in the process of adjusting focus of UV CCD were analyzed in detail, including the backlash of rotation gear and system overshoot.

• 分析了对焦控制过程中误差产生的原因，主要包括传动机构的空回及系统的过冲量。通过实验测量得到传动机构的空回和过冲量，将其加入紫外对焦过程的总对焦量。