Paper Info
Title
A Time Scale For Satellite Navigation Systems: Why And How?
Abstract
Presently, Europe is on the way to conceiving its own contribution towards GNSS2 with the satellite navigation system Galileo. The heart of such a system is composed of clocks, i.e. ultra-stable frequency sources which exist in several types. These clocks can be met in the space and ground segment. The system provider needs to mutually synchronize all these clocks very accurately, which should be considered already in the system architecture phase. This leads to the generation of a system reference time which has to be applied for all the common system activities. Such a time scale can be implemented very differently: a master or ensemble clock strategy can be followed. This has certain consequences for the system time's stability and reliability. This paper gives some overview on these matters. It answers the questions about why we need this time scale and how to establish it in a very formulaic way. The time scale has to be linked to the UTC for several reasons. An implementation example and the following simulation try to illustrate this and give an impression on the error limits to be considered by the different users. This paper is a contribution to the present Galileo system architecture discussion. Copyright (C) 2000 John Wiley & Sons, Ltd.
Year
DOI
Venue
2000
10.1002/1099-1247(200007/10)18:4/5<305::AID-SAT661>3.0.CO;2-9
INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS
Keywords
Field
DocType
navigation, timing, system time scale, ensemble clock, clocks, Galileo, clock error
Galileo (satellite navigation),Synchronization,Telecommunications,Satellite navigation,Impression,Satellite navigation system,System time,Systems architecture,Engineering,Ground segment
Journal
Volume
Issue
ISSN
18
4-5
0737-2884
Citations 
PageRank 
References 
1
1.53
0
Authors
2
Name
Order
Citations
PageRank
J. H. Hahn152.93
Tavella, P.2104.87