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Differential Ionospheric Effects in GPS Based Navigation of Formation Flying Spacecraft

Barneveld, P.W.L. and Montenbruck, Oliver and Visser, Pieter (2008) Differential Ionospheric Effects in GPS Based Navigation of Formation Flying Spacecraft. 3rd International Symposium on Formation Flying, Missions and Technology, 2008-04-23 - 2008-04-25, Noordwijk.

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For the Tandem-X and TerraSAR-X forma- tion to achieve its scientific goals, a rela- tive positioning accuracy is required of 1 mm. This formation is characterised by rel- atively small baselines (less than 1 km). Sin- gle differenced ionospheric delays in the GPS observations are therefore expected to be small, which can be exploited in a filter con- struction. This paper investigates the ionospheric de- lays that might be expected on small base- lines. As a test case for Tandem-X and TerraSAR-X the GRACE switch manoeuvre is taken. From the investigation some results are derived on the influence of spacecraft separation on a relative navigation Kalman filter. The relative navigation algorithms gener- ally make use of the observation data on both GPS carrier frequencies to eliminate ionospheric interference. Using the iono- sphere free combination of these frequencies comes at the cost of introducing some addi- tional noise to the observables. This noise affects the ambiguity resolution process. It is shown that high precision relative naviga- tion with only one GPS frequency is feasible for short baselines and might benefit the in- teger ambiguity resolution process.

Document Type:Conference or Workshop Item (Paper)
Title:Differential Ionospheric Effects in GPS Based Navigation of Formation Flying Spacecraft
AuthorsInstitution or Email of Authors
Barneveld, P.W.L.TU Delft
Montenbruck, OliverUNSPECIFIED
Visser, PieterTU Delft
Date:April 2008
Keywords:Relative Navigation, Differenbtial ionospheric Effects, GPS, TanDEM-X
Event Title:3rd International Symposium on Formation Flying, Missions and Technology
Event Location:Noordwijk
Event Type:international Conference
Event Dates:2008-04-23 - 2008-04-25
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignement
DLR - Research area:Space
DLR - Program:W - no assignement
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 2009
Last Modified:27 Apr 2009 15:44

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