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    Real-Time GNSS satellite SISRE and its integrity for LEO satellite POD

    94307.pdf (1.015Mb)
    Access Status
    Open access
    Authors
    Chen, Beixi
    Wang, Kan
    El-Mowafy, Ahmed
    Yang, Xuhai
    Date
    2024
    Type
    Conference Paper
    
    Metadata
    Show full item record
    Citation
    Chen, B. and Wang, K. and El-Mowafy, A. and Yang, X. 2024. Real-Time GNSS satellite SISRE and its integrity for LEO satellite POD. In Proceedings of 2024 International Technical Meeting of The Institute of Navigation, 23 - 25 Jan 2024, Long Beach, California.
    Source Title
    Proceedings of the 2024 International Technical Meeting of The Institute of Navigation
    Source Conference
    2024 International Technical Meeting of The Institute of Navigation
    Faculty
    Faculty of Science and Engineering
    School
    School of Earth and Planetary Sciences (EPS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP190102444
    URI
    http://hdl.handle.net/20.500.11937/94523
    Collection
    • Curtin Research Publications
    Abstract

    The real-time Global Navigation Satellite System (GNSS) precise orbital and clock products are essential prerequisites for the Positioning, Navigation, and Timing (PNT) services and have been assessed in various studies. Compared to the precision of the orbital and clock products, their combined effect expressed in Signal-In-Space Ranging Error (SISRE) is of higher concern for positioning users. As a special user of the GNSS, the Low Earth Orbit (LEO) satellites need high-precision real-time GNSS products for their Precise Orbit Determination (POD) and clock determination in real time, which enables the future LEO-augmented GNSS PNT service. This study performs a comprehensive analysis of the real-time GNSS products from five different analysis centers, including analysis of their continuity, accuracy of their orbits, precision of their clocks, and their SISREs for LEO satellites at different altitudes. Using the tested products, the LEO POD was also performed to verify the correlation between the quality of the GNSS products and the accuracy of the LEO POD. Furthermore, to assess the integrity of real-time GNSS products, the overbounding standard deviations and mean values of the combined clock and orbital errors were computed and compared for different institutions. It was found that the GPS and Galileo SISRE range from a few centimeters to around 8 cm, while the SISRE of the Beidou Satellite Navigation System (BDS) Medium Earth Orbit (MEO) is a bit worse, i.e., around 1-2 dm. It has been demonstrated that there exists a positive correlation between the SISRE and user altitude, which implies a higher bias introduced to LEO satellites than ground users. The overbounding standard deviations and mean values of the GPS and Galileo products are all within 1 dm, whereas for BDS they are about 1-2 dm. Among the tested products, the smallest SISRE and overbounding values were delivered by the National Centre for Space Studies (CNES) in France for GPS and Galileo, while the GNSS Research Center of Wuhan University (WHU) provided the best accuracy and integrity for the BDS MEO products.

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