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A Comparative Study of SBAS Systems for Navigation in Geostationary Orbit

Kahr, Erin and Montenbruck, Oliver and O'Keefe, Kyle (2015) A Comparative Study of SBAS Systems for Navigation in Geostationary Orbit. ION GNSS 2015, 14.-18. Sep. 2015, Tampa, FL.

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Real data has been collected from space demonstrating the CanX-2 receiver’s ability to track the WAAS, EGNOS, GAGAN, and MSAS systems. Two types of analysis were performed, in order to assess the suitability of SBAS ranging measurements as a source of positioning information for users in geostationary and other higher orbits, in which SBAS satellites may be permanently in view while GPS visibility is severely limited by the shape of the transmit gain patterns. The first analysis, of the transmit gain patterns of the EGNOS, WAAS, MSAS and GAGAN systems, revealed that all the SBAS satellites transmit enough power to be tracked over the earth’s limb. It was revealed that GAGAN has a narrow gain pattern than the other SBAS systems, WAAS and EGNOS appear to have similar gain patterns but WAAS has a higher transmit power by 2-4 dB, and MSAS appears to transmit lower signal power than the other systems but uses an antenna design providing more even global coverage, which results in and stronger power transmitted towards the edge of the earth. The second study determined that the SBAS ranging capability was useable in space, provided that the fast correction data transmitted by the SBAS satellites was applied in addition to the MT9 broadcast ephemeris. The SBAS ranging accuracy is lower than it is for the standard GPS MEO signals, but in most cases the errors are within +/- 10 m for WAAS and +/- 20 m for MSAS and GAGAN. EGNOS does not support ranging. Provided the lower accuracy compared to GPS is taken into account, the SBAS systems could be used to provide positioning and timing information to users in GEO or other orbits above the MEO GNSS constellations

Item URL in elib:https://elib.dlr.de/100288/
Document Type:Conference or Workshop Item (Speech)
Title:A Comparative Study of SBAS Systems for Navigation in Geostationary Orbit
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kahr, ErinUniv. CalgaryUNSPECIFIED
O'Keefe, KyleUniv. of CalgaryUNSPECIFIED
Date:September 2015
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 3875-3886
Keywords:CanX-2; SBAS; GEO
Event Title:ION GNSS 2015
Event Location:Tampa, FL
Event Type:international Conference
Event Dates:14.-18. Sep. 2015
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Vorhaben Infrastruktur und Unterstützung für Raumflugbetrieb
Location: Oberpfaffenhofen
Institutes and Institutions:Space Operations and Astronaut Training
Deposited By: Montenbruck, Dr.rer.nat.hab. Oliver
Deposited On:07 Dec 2015 14:06
Last Modified:31 Jul 2019 19:57

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