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    The ADOP and PDOP: Two complementary diagnostics for GNSS positioning

    76978.pdf (50.28Mb)
    Access Status
    Open access
    Authors
    Wang, Kan
    Teunissen, Peter
    El-Mowafy, Ahmed
    Date
    2020
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Wang, K. and Teunissen, P. and El-Mowafy, A. 2020. The ADOP and PDOP: Two complementary diagnostics for GNSS positioning. Journal of Surveying Engineering. 146 (2): 04020008.
    Source Title
    Journal of Surveying Engineering
    DOI
    10.1061/(ASCE)SU.1943-5428.0000313
    ISSN
    0733-9453
    Faculty
    Faculty of Science and Engineering
    School
    School of Earth and Planetary Sciences (EPS)
    Remarks

    This material may be downloaded for personal use only. Any other use requires prior permission of the American Society of Civil Engineers. This material may be found at https://ascelibrary.org/doi/10.1061/%28ASCE%29SU.1943-5428.0000313.

    URI
    http://hdl.handle.net/20.500.11937/76754
    Collection
    • Curtin Research Publications
    Abstract

    The Ambiguity Dilution of Precision (ADOP) and the Position Dilution of Precision (PDOP) are two popular scalar-diagnostics used in Global Navigation Satellite System (GNSS) positioning. Where the ADOP is a predictor for carrier-phase ambiguity resolution performance, the PDOP is meant to predict the receiver-satellite geometry’s capability for precise positioning. We will show however, although the PDOP works well for code-based positioning, that one has to exercise great care in using the PDOP for real-time kinematic (RTK) positioning. We show that the ADOP and PDOP have distinct behaviors, an important consequence of which is that one can have time periods with small PDOPs, and thus seemingly good geometry for precise positioning, but at the same time large ADOPs, thus showing that successful ambiguity resolution and therefore precise positioning will not be possible. Also the reverse situation may occur, i.e. having large PDOPs with small ADOPs. In such a situation, the large PDOPs should not automatically lead to the conclusion of poor position performance, since the large gain that ambiguity resolution brings will often still make precise positioning possible. We will analyse and explain this complementary behavior of the PDOP and ADOP, and demonstrate this both analytically and empirically. For this analysis we use real Global Positioning System (GPS) single- and multi-frequency signals and GPS/Quasi-Zenith Satellite System (QZSS), GPS/Navigation with Indian Constellation (NAVIC) L5 signals of two baselines located in Perth, Australia.

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