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Abstract

Time series of parameter estimates from GPS analyses (including Earth
orientation parameters, geocentre estimates and coordinate time
series) contain spurious periodic signals at harmonics of the GPS
draconitic year. These harmonic signals are expressions of error in
the GPS analyses and the causes of these errors are not fully
understood. It has been demonstrated that mis-modelling sub-daily
loading signals (for example atmospheric tidal loading deformation),
high multipath as well as failing to resolve ambiguities to integer
values can influence the expression of these spurious signals. The
dominant source of the error however remains unknown, and
the residual periodic error limits the ability of GPS to detect surface
deformations at the mm level. In this poster we describe the problem
and investigate several possible causes pertaining to orbit modelling
of the GPS constellation.

Item Type:	Article
Authors/Creators:	Tregoning, P and Watson, CS
Journal or Publication Title:	Geophysical Research Abstracts
Additional Information:	© Author(s) 2010
Item Statistics:	View statistics for this item

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