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  • sbas orbit and satellite clock corrections for precise point positioning

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 911
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     the quality of real-time gps positions based on the method of precise point positioning (ppp) heavily depends on the availability and accuracy of gps satellite orbits and satellite clock corrections. satellite-based augmentation systems (sbas) provide such corrections but they are actually intended to be used for wide area differential gps with positioning results on the 1-m accuracy level. nevertheless, carrier phase-based ppp is able to achieve much more accurate results with the same correction values. we applied sbas corrections for dual-frequency ppp and compared the results with ppp obtained using other real-time correction data streams, for example, the gps broadcast message and precise corrections from the french centre national d’etudes spatiales and the german deutsches zentrum für luftund raumfahrt. among the three existing sbas, the best results were achieved for the north american wide area augmentation system (waas): horizontal and vertical position accuracies were considerably smaller than 10 cm for static 24-h observation data sets and smaller than 30 cm for epoch-by-epoch solutions with 2 h of continuous observations. the european geostationary navigation overlay service and the japanese multi-functional satellite augmentation system yield positioning results with biases of several tens of centimeters and variations larger by factors of 2–4 as compared to waas.

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