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    Aliased tidal signatures in continuous GPS height time series

    117382_4688_Penna_GRL_03.pdf (145.6Kb)
    Access Status
    Open access
    Authors
    Penna, Nigel
    Stewart, Michael
    Date
    2003
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Penna, N. T. and Stewart, M. P. 2003. Aliased tidal signatures in continuous GPS height time series. Geophysical Research Letters. 30 (23): pp. 2184-2188.
    Source Title
    Geophysical Research Letters
    DOI
    10.1029/2003GL018828
    ISSN
    00948276
    Faculty
    Department of Spatial Sciences
    Faculty of Science and Engineering
    The Western Australian School of Mines
    Remarks

    Accepted for publication in Geophysical Research Letters. Copyright © 2003. American Geophysical Union. Further reproduction or electronic distribution is not permitted.

    URI
    http://hdl.handle.net/20.500.11937/3126
    Collection
    • Curtin Research Publications
    Abstract

    Coordinate time series are often derived from continuous GPS data processed as discrete 24 hour solutions. Under this regimen, residual semi-diurnal and diurnal crustal tide signatures are under-sampled, resulting in aliased periodic signals in the coordinate time series. A secondary aliasing effect, well known from satellite altimetry studies but generally ignored in GPS analysis, arises from the repeat period of the satellite orbits being longer than the Nyquist period of the semi-diurnal and diurnal tidal signatures. This paper derives the theoretical periods for these two aliasing effects for the principal semi-diurnal and diurnal tidal constituents. The presence of both types of aliased signals in GPS time series is then demonstrated using simulated GPS data and also considered for time series derived from real GPS data. It is shown that the beating of the two aliased signals invariably results in spurious signatures in the time series with semi-annual and annual periods.

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