Accuracy Analysis of Precise Point Positioning Using Predicted GPS Satellite Orbits

In this paper, near-real-time positioning accuracies of precise point positioning technique were analyzed using IGS predicted orbits. As a result, we could get the mean errors of 1~1.6 cm, standard deviation of 1~1.3cm from one year of GPS data. This results were similar level to positioning accuracy using the IGS rapid orbits. Positioning errors of >10cm showed 44% of observed days of orbital anomalies. When the orbital anomalies of the predicted orbits were shown, maximum error was 1.7 km, and maximum of mean errors was 308 m. From this study, we conclude that check and consideration were necessary before using the IGS predicted orbits.Key words : GPS, Predicted Orbits, Precise Point Positioning, Positioning Accuracy * bcdefg#>h i(Satellite Navigation Team, Korea Aerospace Research Institute) ‧ 1jk(First Author) : * W ‧ lmnk: 201210 3n ‧ o h z{(GNSS, Global Navigation Satellite System) G*C|GPS(Global Positioning System) WP }~h, / , €9, , ‚ƒ,„( U Km†,. GNSS' #$ ‡ˆ‰hŠ‹pBP #(Relative Positioning)Œ!" #(Point Positioning)8CQ†,. BP # 2x BHJ X QŽ ' *‘BP’“w) * ’hM8, b€45”'€w#$ & '•B –,. !" # #$ ‡'—mk* !nJ XHJ  ˜ * ’hM8IGS(International GNSS Service) b* /45‡ ‡' *‘ & '•B –,. IGS b* GPS (Precise Orbits), 9: (Rapid Orbits), ™9: (Ultra-Rapid Orbits), -š