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|
|Keywords:||Relative Navigation, Differenbtial ionospheric Effects, GPS, TanDEM-X|
|Event Title:||3rd International Symposium on Formation Flying, Missions and Technology|
|Event Type:||international Conference|
|Event Dates:||2008-04-23 - 2008-04-25|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W - no assignement|
|DLR - Research area:||Space|
|DLR - Program:||W - no assignement|
|DLR - Research theme (Project):||W -- no assignement (old)|
|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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