DocumentCode :
52669
Title :
Simulating the Impact of Refractive Transverse Gradients Resulting From a Severe Troposphere Weather Event on GPS Signal Propagation
Author :
Norman, R.J. ; Le Marshall, J. ; Rohm, W. ; Carter, B.A. ; Kirchengast, G. ; Alexander, S. ; Liu, C. ; Zhang, K.
Author_Institution :
SPACE Res. Centre, RMIT Univ., Melbourne, VIC, Australia
Volume :
8
Issue :
1
fYear :
2015
fDate :
Jan. 2015
Firstpage :
418
Lastpage :
424
Abstract :
In this study, the effects of transverse refractive gradients in the ionosphere and in the lower atmosphere on GPS signal paths for both ground-based receivers and receivers on board low Earth orbital satellites are examined. A three-dimensional numerical ray tracing technique, based on geometrical optics, together with the models of the ionosphere, lower atmosphere, and magnetic field, are used to simulate GPS signal propagation. The average transverse refractive gradients were determined from a tropospheric storm event over Melbourne, Australia, on 6th of March, 2010. The traditional GPS ionospheric and atmospheric retrieval methods assume spherical stratification of the refractivity in the atmosphere and typically do not take into consideration the transverse refractivity gradients acting on the GPS signals. The transverse displacements of the GPS signal paths are calculated for both ground-based stations and for low Earth orbit radio occultation paths.
Keywords :
Global Positioning System; ionospheric techniques; ray tracing; refractive index; remote sensing; storms; AD 2010 03 06; Australia; GPS signal propagation; Melbourne; atmosphere refractivity; geometrical optics; ground-based receivers; ionosphere; low Earth orbital satellites; lower atmosphere; magnetic field; severe troposphere weather event; spherical stratification; three-dimensional numerical ray tracing technique; transverse refractive gradients; tropospheric storm; Atmospheric modeling; Global Positioning System; Ionosphere; Ray tracing; Refractive index; Storms; Global Positioning System; radiowave propagation; ray tracing; refractivity; severe weather;
fLanguage :
English
Journal_Title :
Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of
Publisher :
ieee
ISSN :
1939-1404
Type :
jour
DOI :
10.1109/JSTARS.2014.2344091
Filename :
6891126
Link To Document :
بازگشت