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7054601 
Journal Article 
LION NAVIGATOR GPS/GALILEO RECEIVER FOR SPACECRAFT NAVIGATION 
Gottzein, E; Kuehl, C; Filippi, H; Barrios-Montalvo, A; Krauss, PA; Heim, J; , 
2011 
INST NAVIGATION 
WASHINGTON 
2754-2766 
WOS:000304032002083 
The paper summarizes how recent developments in the field of satellite navigation generate new opportunities for use of satellite navigation in space. It describes the development of a next generation GPS/Galileo receiver to use these innovations. In particular the potential to determine autonomously and in real-time the "position, velocity and time (PVT)" with high accuracy onboard of the spacecraft has many applications. Examples are autonomous orbit maintenance to simplify satellite operation and onboard autonomous " Image Navigation and Registration (INR)" to improve the availability and quality of products in Earth Observation missions. The motivation and basis for the development work reported in this publication are threefold:1. The extension of "GPS Signal In Space (SIS)" guaranty by the " Space Service Volume (SSV)" starting with GPSIII for signals L1, L2, and L5,[7], [8]. A similar extension is proposed for Galileo [9].2. New innovative civil signals of GPS and the Galileo constellations (pilot signals, higher chipping and data rates, etc.)3. GPS/Galileo interoperability and compatibility as laid down in the US-EU Agreement on GPS/Galileo Cooperation [13]. To use the above described features for real-time onboard autonomous navigation of spacecraft, a next generation navigation receiver is developed at Astrium, the LION Navigator. It will use all future open signals of GPS and Galileo in the E1/L1, L2, and E5/L5 bands. The goal is to reach sub-meter absolute position accuracy in low Earth orbits, and an accuracy of similar to 100m (rms) for satellites in geosynchronous orbits.The paper describes development steps of the LION Navigator HW and SW and discusses results from performance tests for satellites in " Low Earth Orbits (LEO)" and "Geostationary Orbits (GEO)" orbits. By using the combination of new GPS and Galileo signals (E5a/L1 and/or E5a/L5), considerable improvements in accuracy and availability in comparison to GPS L1 only is achieved. 
24th International Technical Meeting of the Satellite Division of the Institute of Navigation (ION GNSS) 
Portland, OR