期刊
MEASUREMENT SCIENCE AND TECHNOLOGY
卷 21, 期 7, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-0233/21/7/073001
关键词
GPS satellite clock; periodic variation; prediction model
资金
- Korea Research Council of Fundamental Science Technology
- National Research Council of Science & Technology (NST), Republic of Korea [kari-2010-1] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The broadcast ephemeris and IGS ultra-rapid predicted (IGU-P) products are primarily available for use in real-time GPS applications. The IGU orbit precision has been remarkably improved since late 2007, but its clock products have not shown acceptably high-quality prediction performance. One reason for this fact is that satellite atomic clocks in space can be easily influenced by various factors such as temperature and environment and this leads to complicated aspects like periodic variations, which are not sufficiently described by conventional models. A more reliable prediction model is thus proposed in this paper in order to be utilized particularly in describing the periodic variation behaviour satisfactorily. The proposed prediction model for satellite clocks adds cyclic terms to overcome the periodic effects and adopts delay coordinate embedding, which offers the possibility of accessing linear or nonlinear coupling characteristics like satellite behaviour. The simulation results have shown that the proposed prediction model outperforms the IGU-P solutions at least on a daily basis.
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