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http://dx.doi.org/10.7840/kics.2012.37C.12.1310

Analysis of GPS Galileo Time Offset Effects on Positioning  

Joo, Jung-Min (한국항공우주연구원 교통.항법기술연구센터 위성항법팀)
Cho, Jeong-Ho (한국항공우주연구원 교통.항법기술연구센터 위성항법팀)
Heo, Moon-Beom (한국항공우주연구원 교통.항법기술연구센터 위성항법팀)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.37C, no.12, 2012 , pp. 1310-1317 More about this Journal
Abstract
The Global Navigation Satellite System (GNSS) like US Global Positioning System (GPS) and EU Galileo are based on providing precise time and frequency synchronized ranging signals. Because of the exploitation of very precise timing signals these GNSS are used to provide both navigation and time distribution services. Moreover, because the positioning accuracy will improve as more satellites become available, we should expect that a combination of Galileo and GPS will provide better performance than those of both systems separately. However, Galileo will not use the same time reference as GPS and thus, a time difference arises - the GPS-Galileo Time Offset (GGTO). The navigation solution calculated by receivers using signals from both navigation systems will consequently contain a supplementary error if the GGTO is not accounted for. In this paper, we compared GPS Time (GPST) with Galileo Sytem Time (GST) and analyzed the effects of GGTO on positioning accuracy by simulation test. And then we also analyzed the characteristics of two representative GGTO correction methods such as the navigation message based method at system level and the estimation method at user level and propose the conceptual design of the novel correction method being capable of preventing previous method's problems.
Keywords
GPST; GST; GPS Galileo Time Offset;
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Times Cited By KSCI : 1  (Citation Analysis)
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