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LEO Satellite Navigation Errors and VTEC in Single-frequency GPS Tracking

Garcia-Fernandez, Miquel and Montenbruck, Oliver (2005) LEO Satellite Navigation Errors and VTEC in Single-frequency GPS Tracking. Radio Science, 41, RS5001-1-RS5001-7. American Geophysical Union. DOI: DOI 10.1029/2005RS003420.

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Official URL: http://www.agu.org/

Abstract

In the context of space applications, the GPS system is presently a well established and accepted tracking system. To meet the basic navigation requirements, most satellites in a low Earth orbit (LEO) are equipped with single-frequency GPS receivers that measure the C/A code as well as the L1 phase. However, the resulting kinematic navigation solutions exhibit systematic position errors caused by elevation dependent ionospheric path delays. In this study a simple analytical model is established, which quantitatively relates the position error to the vertical electron content (VTEC) and the mapping function. This model substantiates the empirical evidence of a mean radial offset that increases in proportion to the total electron content above the satellite. It is furthermore shown that the ratio between this offset and the vertical ionospheric path delay depends on the applied elevation mask angle. Representative ratios of 3-5 are obtained for the mapping function of the Lear ionosphere model and elevation cut-off angles of 10°, 5° and 0°. This analytical result has further been confirmed by signal simulator tests as well as flight data of the CHAMP satellite.

Document Type:Article
Title:LEO Satellite Navigation Errors and VTEC in Single-frequency GPS Tracking
Authors:
AuthorsInstitution or Email of Authors
Garcia-Fernandez, MiquelUNSPECIFIED
Montenbruck, OliverUNSPECIFIED
Date:November 2005
Journal or Publication Title:Radio Science
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:41
DOI:DOI 10.1029/2005RS003420
Page Range:RS5001-1-RS5001-7
Publisher:American Geophysical Union
Status:Accepted
Keywords:Ionosphere, LEO Satellites, GPS Tracking, VTEC
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W SY - Technik für Raumfahrtsysteme
DLR - Research area:Space
DLR - Program:W SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):W -- no assignement (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Space Operations and Astronaut Training
Deposited By: Dr.rer.nat.hab. Oliver Montenbruck
Deposited On:22 Jan 2007
Last Modified:14 Jan 2010 20:45

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