【摘要】 文章通过对"高分五号"卫星大气环境红外甚高光谱探测仪太阳跟踪器的设计,探讨了航天器高精度高稳定度跟踪指向技术,提出了一种挠性枢轴支撑、音圈电机驱动的高精度跟踪机构设计方法。挠性枢轴传动环节无接触摩擦,能够实现较高精度的轴系支撑;音圈电机具有结构简单、便于控制的优点,适用于短行程快响应的高精度闭环伺服控制系统,同时满足航天产品轻质、可靠的设计要求。跟踪控制采用基于位置反馈的闭环控制实现太阳粗跟踪,结合图像信息反馈的闭环控制实现精跟踪。通过仿真分析和试验测试,验证了机构跟踪精度可达0.065mrad、跟踪稳定度可达14.2μrad。该设计方法可为空间相似载荷的跟踪、扫描系统提供借鉴。更多还原

【Abstract】 Key technologies of space high precision sun-tracking system applied in GF-5 satellite are researched in this paper. A tracking mechanism supported by two flexural pivots and driven by a voice coil motor is designed. Flexural pivot is one kind of frictionless, stiction-free bearing, ideally suited for high precision tracking mechanism. Voice coil motor has a simple structure without any structure for reversing, and is easy to be controlled. In the system control strategy, an initial tracking is combined with a final tracking, that is, a closed-loop control based on position feedback does the initial sun tracking, and then a closed-loop control based on image information feedback accomplishes the final sun tracking. The system can reach the tracking accuracy of up to 0.065 mrad, and the tracking stability of up to 14.2μrad, which is proved by some tests in the end. This method is suitable for many similar tracking and scanning system in space products.更多还原