GPS-based timing system for LAMOST

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	GPS-based timing system for LAMOST
	Xinqi Xu; Gangping Jin
	2003-02-01
会议录名称	Large Ground-based Telescopes
卷号	4837
期号	4837
页码	Vol.4837 63-70
会议日期	2002-8-22
会议地点	Hawaii USA
会议主办者	The International Society for Optical Engineering
出版者	SPIE
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.
关键词	Gps Real Time Time System Utc Nts
学科领域	郭守敬望远镜（lamost） ; 自动控制
文献类型	会议论文
条目标识符	http://ir.niaot.ac.cn/handle/114a32/358
专题	会议论文
推荐引用方式 GB/T 7714	Xinqi Xu,Gangping Jin. GPS-based timing system for LAMOST[C]:SPIE,2003:Vol.4837 63-70.

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