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    Real-time LEO satellite precise orbit and clock determination: Strategies and Challenges

    Access Status
    In process
    Authors
    Wang, Kan
    Chen, Beixi
    Xie, Wei
    Liu, Jiewei
    Wu, Meifang
    El-Mowafy, Ahmed
    Date
    2025
    Type
    Conference Paper
    
    Metadata
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    Citation
    Wang, K. and Chen, B. and Xie, W. and Liu, J. and Wu, M. and El-Mowafy, A. 2025. Real-time LEO satellite precise orbit and clock determination: Strategies and Challenges. In: European Geophysical Union (EGU) General Assembly 2025, 27th Apr 2025, Vienna.
    Source Conference
    European Geophysical Union (EGU) General Assembly 2025
    Faculty
    Faculty of Science and Engineering
    School
    School of Earth and Planetary Sciences (EPS)
    URI
    http://hdl.handle.net/20.500.11937/98081
    Collection
    • Curtin Research Publications
    Abstract

    To realize the various benefits brought by Low Earth Orbit (LEO) satellites in single-receiver high-precision GNSS-based Positioning Navigation and Timing (PNT) services, LEO satellite orbits and clocks need to be processed and delivered to users in real-time with precision of a few centimeters. While post-processing of cm-level LEO satellite orbits and clocks can be widely achieved, real-time processing faces various Challenges. When the number of LEO satellites increases, the observation data downlinked to the processing center may experience large and complicated discontinuities and incompleteness depending on the downlinking strategies. Even with the observations downlinked in real-time, the LEO satellite clock precision tends to be very sensitive to the continuity and quality of the GNSS real-time products. This study first introduces the procedure for ground-based cm-level real-time LEO satellite Precise Orbit Determination (POD), including near-real-time POD, short-term prediction, and ephemeris fitting/broadcasting. Next, the short-term predicted orbits and long-term predicted clocks of LEO satellites are introduced and properly constrained in filter-based real-time LEO satellite clock determination to achieve a precision of about 0.2 ns. Strategies to deal with sub-optimal observation data and GNSS products are explained. With the proposed methods, a Signal-In-Space Ranging Error at sub-dm to 1 dm can be achieved in practice.

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      Low Earth Orbit (LEO) satellite orbits are required in real-time with high accuracy to enable the LEO augmentation to Global Navigation Satellite Systems (GNSSs) for its use in Positioning, Navigation and Timing (PNT). ...
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