GPS-based timing system for LAMOST | |
Xinqi Xu ; Gangping Jin | |
2003-02-01 | |
会议日期 | 2002-8-22 |
会议地点 | Hawaii USA |
关键词 | GPS real time time system UTC NTS |
卷号 | 4837 |
期号 | 4837 |
页码 | Vol.4837 63-70 |
英文摘要 |
The control system of LAMOST telescope is highly distributed real time system, and the time base is crucial. During the motion tracking for 4000 celestial objects being simultaneously observed the alt-azimuth mount has to be driven on two axes in a servo loop to follow the motion of the objects in a timing system that has to be precise to the level of a few milliseconds.
The GPS-based timing system has been developed in the lab of Nanjing Institute of Astronomical Optics & Technology (NIAOT). This paper describes a Net Time Server (NTS) that maintains the Coordinated Universal Time (UTC) derived from GPS, and distributes the time to precisely synchronize the client computer clocks
across a network. The NTS is built on real time OS QNX4.25 platform. With help of a GPS receiver at hand, the NTS reaches the precision of 0.1 millisecond, and the time precision across LAN computers served by the NTS can meet the requirements for different time critical tasks in LAMOST control. |
会议主办者 | The International Society for Optical Engineering |
会议录 | Large Ground-based Telescopes |
会议录出版者 | SPIE |
学科主题 | 郭守敬望远镜(LAMOST) ; 自动控制 |
内容类型 | 会议论文 |
源URL | [http://ir.niaot.ac.cn/handle/114a32/358] |
专题 | 南京天文光学技术研究所_中科院南京天光所知识成果_会议论文 南京天文光学技术研究所_望远镜新技术研究室_会议论文 |
推荐引用方式 GB/T 7714 | Xinqi Xu,Gangping Jin. GPS-based timing system for LAMOST[C]. 见:. Hawaii USA. 2002-8-22. |
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