基于GPS的FAST望远镜馈源平台自动测量控制系统

Automatic GPS-based surveying and control system for FAST radio telescope

500m直径大射电望远镜(简称FAST望远镜)的跟踪观测是由馈源的空间运动来实现,因此馈源在搜索运动过程中要保持很高的稳定性。就馈源平台自动控制系统对位置和姿态测量精度要求进行分析,提出了采用实时动态技术和全球定位系统(GPS)姿态测量技术进行馈源平台的实时监控,以实现整个FAST望远镜对宇宙射电源的自动化跟踪。介绍了GPS时实动态姿态测量原理和FAST监测系统的构成,以及姿态测量的数学模型和解算方法。该方法在50mFAST馈源模型上试验得到馈源平台中心点位精度为5.65mm、姿态精度0.345°可以满足FAST望远镜一次支撑的精度要求。

The Five hundred meter Aperture Spherical Telescope (FAST) was tracked using spatial feedback of the movement, maintain the excellent feedback stability during the searching movement. The position and attitude accuracies were analyzed by the feedback platform automatic control system with the GPS RTK (real time kinematics) technique and the GPS attitude surveying technique to provide automatic FAST tracking of the cosmic radio source. This paper describes the theory for GPS RTK attitude surveying, the structure of the FAST monitoring system, and solution method. The method was used to test a 50 m FAST feedback model and realizes the accuracy of the feedback platform conter being 5, 65 mm and the attitude accuracy being 0.345°, which meets the accuracy needs of the first implementation of FAST.