ITU-R QUESTION 2497-2009 Time and frequency information from enhanced LOng Range Aid to Navigation (eLORAN)《“增强”远程导航信息的时间和频率》.pdf

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1、QUESTION ITU-R 249/7 Time and frequency information from “enhanced” LOng Range Aid to Navigation (eLORAN) (2009) The ITU Radiocommunication Assembly, considering a) that eLORAN is the primary Position Navigation and Timing (PNT) backup to the Global Positioning System for some countries; b) that LOR

2、AN is available in many areas of the world; c) that eLORAN will be a source for precise time and frequency information; d) that user equipment specific to time and frequency users may soon be widely available, decides that the following Questions should be studied 1 What is the geographical coverage

3、 for time and frequency use of eLORAN? 2 Can eLORAN provide similar backup to users of other Global Navigational Satellite System (GNSS) services? 3 What is the time and frequency performance of eLORAN? 4 Will time and frequency information from eLORAN be traceable to National Metrology Institutes and to Coordinated Universal Time (UTC)? further decides 1 that the results of the above studies should be included in one or more Recommendations and/or Reports; 2 that the above studies should be completed by 2012. Category: S2