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Effects of azimuthal multipath asymmetry on long GPS coordinate time series


Goebell, S and King, MA, Effects of azimuthal multipath asymmetry on long GPS coordinate time series, GPS Solutions, 15, (3) pp. 287-297. ISSN 1080-5370 (2011) [Refereed Article]

Copyright Statement

Copyright Springer-Verlag 2011

DOI: doi:10.1007/s10291-011-0227-7


Carrier phase multipath is currently one source of unmodeled signals that may bias GPS coordinate time series significantly. We investigate the effect of simulated carrier phase multipath on time series of several sites covering the period 2002.0-2008.0 and spanning a range of observation geometries. High-, mid-, and low-latitude IGS sites are investigated as well as sites with significant signal obstructions. We examine the effect of multipath in different sectors of the sky, considering time-constant, horizontal reflectors at each of 0.1, 0.2, and 1.5 m below the antenna. The differences between a horizontally uniform multipath source are analyzed, and it is shown that positioning errors are generally larger when unmodeled carrier phase multipath is azimuthally heterogeneous. Using the adopted multipath model, height biases reach ±1 mm in case of the symmetric multipath and ±5 mm for the asymmetric multipath but this increases to being ±10 mm in the worst case. In addition to mean bias, low-frequency variations in the bias also exist, including periodic signals and leading to velocity biases of up to ±0.1 mm/year in the symmetric case and ±1 mm/year in the asymmetric case over the considered period. In contrast to the generally slowly varying observation geometry that is typically experienced, we show the effects of an abrupt change in geometry due to receiver/antenna hardware changes; in the case considered, we see changed pattern of temporal variation in the bias in addition to an instantaneous offset. © 2011 Springer-Verlag.

Item Details

Item Type:Refereed Article
Keywords:Accuracy; Carrier phase multipath; Coordinate time series; GPS; Velocity; Abrupt change; Accuracy; Carrier phase; Coordinate time series; Low-frequency variations; Multi-path; Multipath models; Periodic signal; Positioning error; Temporal variation
Research Division:Earth Sciences
Research Group:Physical geography and environmental geoscience
Research Field:Physical geography and environmental geoscience not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:King, MA (Professor Matt King)
ID Code:82155
Year Published:2011
Web of Science® Times Cited:5
Deposited By:Geography and Environmental Studies
Deposited On:2013-01-16
Last Modified:2017-09-21

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