Performance of Real-Time Precise Point Positioning |
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| Authors: | Junping Chen Haojun Li Bin Wu Yize Zhang Jiexian Wang Congwei Hu |
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| Institution: | 1. Shanghai Astronomical Observatory , Chinese Academy of Sciences , Shanghai , P.R. China;2. Shanghai Astronomical Observatory , Chinese Academy of Sciences , Shanghai , P.R. China;3. Department of Surveying and Geo-informatics Engineering , Tongji University , Shanghai , P.R. China;4. Department of Surveying and Geo-informatics Engineering , Tongji University , Shanghai , P.R. China |
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| Abstract: | The IGS Real-time Pilot Project (IGS-RTPP) provides real-time precise orbits and clocks, which support real-time positioning for single stations over large areas using the Precise Point Positioning (PPP) technique. This paper investigates the impact of real-time orbits, network configuration, and analysis strategies on real-time PPP implementation and demonstrates the real-time PPP performance. One month of data from the IGS network is analyzed in a real-time simulation mode. Results reveal the following: (1) In clock estimation, differential approaches are much more efficient than the zero-differenced approach. (2) The precision of IGS Ultra rapid (IGU) orbits could meet the IGS-RTPP requirement for precise clock estimation and PPP positioning. (3) Considering efficiency and precision, a network with 50 stations is recommended for the IGS-RTPP. It is demonstrated that the real-time satellite clock precision is 0.1 ns supporting hourly static PPP with a mean precision of 2–3 cm in the North component and 3–4 cm in the other components. Kinematic PPP assessed with onboard GPS data collected from a buoy provided mean coordinate precision of 2.2, 4.2, 6.1 cm in the North, East and Up directions, compared to the RTK solutions. |
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| Keywords: | Wide-area positioning IGU IGS-RTPP PPP |
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