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GPS Satellite Repeat Time Determination and Orbit Prediction Based on Ultra-rapid Orbits  

Lee, Chang-Moon (인하대학교 사회기반시스템공학부 지리정보공학과)
Park, Kwan-Dong (인하대학교 사회기반시스템공학부 지리정보공학과)
Kim, Hye-In (인하대학교 사회기반시스템공학부 지리정보공학과)
Park, Jae-Min (지능형국토정보기술혁신 사업단)
Publication Information
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography / v.27, no.4, 2009 , pp. 411-420 More about this Journal
Abstract
To plan a GPS survey, they have to decide if a survey can be conducted at a specific point and time based on the predicted GPS ephemeris. In this study, to predict ephemeris, we used the repeat time of a GPS satellite. The GPS satellite repeat time was determined by analysing correlation among three-dimensional satellite coordinates provided by the 48-hour GPS ephemeris in the ultra-rapid orbits. By using the calculated repeat time and Lagrange interpolation polynomials, we predicted GPS orbits f3r seven days. As a result, the RMS of the maximum errors in the X, Y, and Z coordinates were 39.8 km 39.7 km and 19.6 km, respectively. And the maximum and average three-dimensional positional errors were 119.5 km and 48.9 km, respectively. When the maximum 3-D positioning error of 119.5 km was translated into the view angle error, the azimuth and elevation angle errors were 9.7'and 14.9', respectively.
Keywords
GPS; Repeat time; Ultra-rapid orbit; Orbit prediction; Lagrange interpolation;
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