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Monument-antenna effects on GPS coordinate time series with application to vertical rates in Antarctica
Citation
King, MA and Bevis, M and Wilson, T and Johns, B and Blume, F, Monument-antenna effects on GPS coordinate time series with application to vertical rates in Antarctica, Journal of Geodesy, 86, (1) pp. 53-63. ISSN 0949-7714 (2012) [Refereed Article]
Copyright Statement
Copyright 2011 Springer-Verlag
DOI: doi:10.1007/s00190-011-0491-x
Abstract
We examine the electromagnetic coupling of a
GPS antenna–monument pair in terms of its simulated affect
on long GPS coordinate time series. We focus on the Earth
and Polar Observing System (POLENET) monument design
widely deployed in Antarctica and Greenland in projects
interested particularly in vertical velocities. We base our
tests on an absolute robot calibration that included the top
∼0.15 m of the monument and use simulations to assess
its effect on site coordinate time series at eight representative
POLENET sites in Antarctica over the period 2000.0–
2011.0. We show that the neglect of this calibration would
introduce mean coordinate bias, and most importantly for
velocity estimation, coordinate noise which is highly sensitive
to observation geometry and hence site location and
observation period. Considering only sub-periods longer than
2.5 years, we show vertical site velocities may be biased by
up to ±0.4 mm/year, and biases up to 0.2 mm/year may persist
for observation spans of 8 years. Changing between uniform
and elevation-dependent observation weighting alters
the time series but does not remove the velocity biases, nor
does ambiguity fixing. The effect on the horizontal coordinates
is negligible. The ambiguities fixed series spectra
shownoise between flicker and randomwalk with near-white
noise at the highest frequencies, with mean spectral indices
(frequencies <20 cycles per year) of approximately −1.3
(uniform weighting) and −1.4 (elevation-dependent weighting).
While the results are likely highly monument specific,
they highlight the importance of accounting for monument
effects when analysing vertical coordinate time series and
velocities for the highest precision and accuracy geophysical
studies.
Item Details
Item Type: | Refereed Article |
---|---|
Keywords: | GPS, time series, monumentation effect, phase centre variation, velocity accuracy |
Research Division: | Earth Sciences |
Research Group: | Geophysics |
Research Field: | Geodesy |
Objective Division: | Environmental Policy, Climate Change and Natural Hazards |
Objective Group: | Understanding climate change |
Objective Field: | Understanding climate change not elsewhere classified |
UTAS Author: | King, MA (Professor Matt King) |
ID Code: | 89659 |
Year Published: | 2012 |
Web of Science® Times Cited: | 14 |
Deposited By: | Geography and Environmental Studies |
Deposited On: | 2014-03-11 |
Last Modified: | 2017-10-24 |
Downloads: | 0 |
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