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Precision Real-Time Navigation of LEO Satellites using Global Positioning System Measurements

Montenbruck, Oliver and Ramos-Bosch, Pere (2007) Precision Real-Time Navigation of LEO Satellites using Global Positioning System Measurements. GPS Solutions, 12 (3), pp. 187-198. DOI: 10.1007/s10291-007-0080-x.

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Abstract

Continued advancements in remote sensing technology along with a trend towards highly autonomous spacecraft provide a strong motivation for accurate real-time navigation of satellites in low Earth orbit (LEO). Global Navigation Satellite System (GNSS) sensors nowadays enable a continuous tracking and provide low noise radiometric measurements onboard a user spacecraft. Following the deactivation of Selective Availability a representative real-time positioning accuracy of 10 m is presently achieved by spaceborne Global Positioning System (GPS) receivers on LEO satellites. This accuracy can notably be improved by use of dynamic orbit determination techniques. Besides a filtering of measurement noise and other short term errors, these techniques enable the processing of ambiguous measurements such as carrier phase or code-carrier combinations. Within this paper a reference algorithm for real-time onboard orbit determination is described and tested with GPS measurements from various ongoing space missions covering an altitude range of 400-800 km. A trade-off between modeling effort and achievable accuracy is performed, which takes into account the limitations of available onboard processors and the restricted upload capabilities. Furthermore, the benefits of different measurements types and the available real-time ephemeris products is assessed. Using GPS broadcast ephemerides a real-time position accuracy of about 0.5 m (3D rms) is feasible with dual-frequency carrier phase measurements. Slightly inferior results (0.6-1m) are achieved with single-frequency code-carrier measurements or dual-frequency code. For further performance improvements the use of more accurate real-time GPS ephemeris products is mandatory. By way of example, it is shown that the TDRSS Augmentation Service for Satellites (TASS) offers the potential for 0.1-0.2m real-time navigation accuracies onboard LEO satellites.

Document Type:Article
Title:Precision Real-Time Navigation of LEO Satellites using Global Positioning System Measurements
Authors:
AuthorsInstitution or Email of Authors
Montenbruck, OliverUNSPECIFIED
Ramos-Bosch, PereUPC
Date:11 July 2007
Journal or Publication Title:GPS Solutions
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:12
DOI:10.1007/s10291-007-0080-x
Page Range:pp. 187-198
Status:Published
Keywords:Real-Time Navigation, Orbit Determination, GPS, LEO satellites
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:04 Jun 2008
Last Modified:15 Jan 2010 01:09

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