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    Impact of stochastic modelling on GPS height and zenith wet delay estimation

    135133_18403_Paper50.pdf (77.41Kb)
    Access Status
    Open access
    Authors
    Lo, Johnny
    El-Mowafy, Ahmed
    Penna, N.
    Featherstone, Will
    Date
    2009
    Type
    Conference Paper
    
    Metadata
    Show full item record
    Citation
    Lo, Johnny and El-Mowafy, Ahmed and Penna, Nigel and Featherstone, Will. 2009. Impact of stochastic modelling on GPS height and zenith wet delay estimation, in A. Dempster (ed), IGNSS 2009 Symposium on GPS/GNSS, Dec 1 2009. Gold Coast, Qld: Menay P/L.
    Source Title
    IGNSS Society 2009 Symposium Proceedings
    Source Conference
    IGNSS2009 Symposium on GPS/GNSS
    ISBN
    9780646525402
    Faculty
    Department of Spatial Sciences
    Faculty of Science and Engineering
    WA School of Mines
    URI
    http://hdl.handle.net/20.500.11937/10898
    Collection
    • Curtin Research Publications
    Abstract

    Most stochastic modelling techniques assume the physical correlations among the raw observations to be negligible when forming the variance covariance matrix of the GPS observations. Such an assumption may, however, lead to significantly biased solutions. The Minimum Norm Quadratic Unbiased Estimation (MINQUE) method is an iterative technique that can be used to estimate spatial correlation among GPS measurements. Studies by previous authors have shown that MINQUE improves the accuracy and the reliability of the ambiguity resolution, and ultimately, the geodetic solution. However, its effect on the estimation of zenith wet delay (ZWD) is somewhat unknown. In this paper, an investigation into its impact on ZWD, as well as heighting, is carried out using simulated data. The results obtained from MINQUE for an observation window of five-days in static mode indicate an average improvement of 51% and 71% in the station height precision when compared against elevation-angle dependent and equal weighting models, respectively. This development, however, did not translate into better ZWD estimation, for which the differences between each respective stochastic model are generally at the sub-millimetre level.

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