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A first look at the effects of ionospheric signal bending on a globally processed GPS network


Petrie, EJ and King, MA and Moore, P and Lavallee, DA, A first look at the effects of ionospheric signal bending on a globally processed GPS network, Journal of Geodesy, 84, (8) pp. 491-499. ISSN 0949-7714 (2010) [Refereed Article]

DOI: doi:10.1007/s00190-010-0386-2


This study provides a first attempt at quantifying potential signal bending effects on the GPS reference frame, coordinates and zenith tropospheric delays (ZTDs). To do this, we homogeneously reanalysed data from a global network of GPS sites spanning 14 years (1995.0-2009.0). Satellite, Earth orientation, tropospheric and ground station coordinate parameters were all estimated. We tested the effect of geometric bending and dTEC bending corrections, which were modelled at the observation level based, in part, on parameters from the International Reference Ionosphere 2007 model. Combined, the two bending corrections appear to have a minimal effect on site coordinates and ZTDs except for low latitude sites. Considering five days (DOY 301-305, 28 October-1 November 2001) near ionospheric maximum in detail, they affect mean ZTDs by up to ~1.7 mm at low latitudes, reducing to negligible levels at high latitudes. Examining the effect on coordinates in terms of power-spectra revealed the difference to be almost entirely white noise, with noise amplitude ranging from 0.3 mm (high latitudes) to 2.4 mm (low latitudes). The limited effect on station coordinates is probably due to the similarity in the elevation dependence of the bending term with that of tropospheric mapping functions. The smoothed z-translation from the GPS reference frame to ITRF2005 changes by less than 2 mm, though the effect combines positively with that from the second order ionospheric refractive index term. We conclude that, at the present time, and for most practical purposes, the geometric and dTEC bending corrections are probably negligible at current GPS/reference frame precisions. © 2010 Springer-Verlag.

Item Details

Item Type:Refereed Article
Keywords:GPS; Higher-order ionospheric terms; Ionospheric propagation; Refractive index; Signal bending; correction; GPS; ionosphere; mapping; numerical model; refractive index; signal; troposphere
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:82151
Year Published:2010
Web of Science® Times Cited:15
Deposited By:Geography and Environmental Studies
Deposited On:2013-01-16
Last Modified:2015-01-27

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