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Precise GRACE baseline determination using GPS

Kroes, R. and Montenbruck, O. and Bertiger, W. and Visser, P. (2005) Precise GRACE baseline determination using GPS. In: GPS Solutions Springer-Verlag GmbH. pp. 21-31. ISBN ISSN: 1080-5370 (Paper) 1521-1886 (Online.

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Precision relative navigation is an essential aspect of spacecraft formation flying missions, both from an operational and a scientific point of view. When using GPS as a relative distance sensor, dual-frequency receivers are required for high accuracy at large inter-satellite separations . This allows for a correction of the relative ionospheric path delay and enables double difference integer ambiguity resolution. Although kinematic relative positioning techniques demonstrate promising results for hardware-in-the-loop simulations, they were found to lack an adequate robustness in real-world applications. To overcome this limitation, an extended Kalman Filter modeling the relative spacecraft dynamics has been developed. The filter processes single difference GPS pseudorange and carrier phase observations to estimate the relative position and velocity along with empirical accelerations and carrier phase ambiguities. In parallel, double difference carrier phase ambiguities are resolved on both frequencies using the least square ambiguity decorrelation adjustment (LAMBDA) method in order to fully exploit the inherent measurement accuracy. The combination of reduced dynamic filtering with the LAMBDA method results in smooth relative position estimates as well as fast and reliable ambiguity resolution. The proposed method has been validated with data from the gravity recovery and climate experiment (GRACE) mission. For an 11-day data arc, the resulting solution matches the GRACE K-Band Ranging System measurements with an accuracy of 1 mm, whereby 83% of the double difference ambiguities are resolved.

Document Type:Book Section
Additional Information: LIDO-Berichtsjahr=2005,
Title:Precise GRACE baseline determination using GPS
AuthorsInstitution or Email of Authors
Montenbruck, O.UNSPECIFIED
Journal or Publication Title:GPS Solutions
Refereed publication:Yes
In ISI Web of Science:Yes
Page Range:pp. 21-31
Springer-Verlag GmbH, UNSPECIFIED
Publisher:Springer-Verlag GmbH
ISBN:ISSN: 1080-5370 (Paper) 1521-1886 (Online
Keywords:Spacecraft formation flying - Relative positioning - GRACE - Integer ambiguity resolution
HGF - Research field:other
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:no assignement
DLR - Program:no assignment
DLR - Research theme (Project):other
Location: Oberpfaffenhofen
Institutes and Institutions:Space Operations and Astronaut Training > Hauptabteilung Raumflugbetrieb und Astronautenausbildung
Deposited By: Sabine Klaas
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 17:31

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