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    An Approach for Instantaneous Ambiguity Resolution for Medium- to Long-range Multiple Reference Station Networks

    Access Status
    Fulltext not available
    Authors
    Hu, Guorong
    Abbey, Donald
    Castleden, James
    Featherstone, Will
    Ovstedal, O
    Date
    2004
    Type
    Journal Article
    
    Metadata
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    Citation
    Hu, Guorong and Abbey, Donald and Castleden, James and Featherstone, Will and Ovstedal, O. 2004. An Approach for Instantaneous Ambiguity Resolution for Medium- to Long-range Multiple Reference Station Networks. GPS Solutions Online: pp. 1-23.
    Source Title
    GPS Solutions
    DOI
    10.1007/s10291-004-0120-8
    ISSN
    10805370
    Faculty
    Department of Spatial Sciences
    Faculty of Science and Engineering
    WA School of Mines
    URI
    http://hdl.handle.net/20.500.11937/16635
    Collection
    • Curtin Research Publications
    Abstract

    Integer ambiguity resolution (AR) is a prerequisite for all high-precision (centimetre level) GPS applications that utilise multiple reference station (MRS) networks. However, due to the presence of distance-dependent GPS errors, notably atmospheric refraction, AR across the network is difficult on an epoch-by-epoch basis, especially for medium- to long-range (typically 30?130 km as used here) MRS networks. This paper presents an approach for medium- to long-range instantaneous AR for MRS networks, based on an ionosphere-weighted observation model and network geometry constraints, along with a multiple ambiguity validation test procedure. The performance of the proposed method was demonstrated through two case-study examples from Australia and Norway. Our test results show that the instantaneous AR success rate varied from 93% (131 km baseline) to 98% (35 km baseline).It is also shown that the adopted high-precision prediction models for the double-difference (DD) ionospheric delay and residual tropospheric zenith delay (RTZD) are of benefit to the high success rate of the network AR. Due to its epoch-by-epoch nature, the proposed approach is insensitive to cycle-slips, rising or setting satellites, or loss-of-lock.

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