Galileo Ground Segment for Navigation and Integrity

Manfred Lugert, Marco Falcone, Peter Claes, Antonio Castro, Sandro Matussi, Juan-Antonio Martinez-Rosique, Miguel Manteiga, and Daniel Blonski

Abstract:	The implementation of the Galileo navigation, timing and integrity-related services is supported by the Galileo Ground Segment. The major functions of controlling the navigation & timing mission and the determination of the integrity of the Signal- in Space and dissemination of related data products are implemented in two major ground systems, the Ground Control Segment (GCS) and the Ground Mission Segment (GMS). The overall Galileo Ground Segment consists of: • A global network of Galileo Sensor Stations (GSS) used for one-way ranging measurements and monitoring of the Signal-in Space of the Galileo satellites for Orbit Determination, Time Synchronisation, Integrity Determination and supervision of provided services. • A global network of Telemetry, Telecommand and Ranging Stations (TT&C) for control of the Galileo satellites and constellation. • A global real-time oriented network of Up-link Stations (ULS) for mission data (navigation, integrity, search & rescue and other navigation-related services. • An interconnecting high performance communication network. • Geographically redundant Galileo Control Centres (GCC). The paper presents the latest status of definition of the Galileo Ground Segment as resulting from on-going definition contracts of the European Space Agency. It will describe the major functions to support the Navigation and Integrity missions, including a presentation of the main technical drivers and operational requirements and the resulting preliminary architecture of the ground segment. The paper addresses the deployment aspects of the Galileo Ground Segment to meet the different requirements of the development and validation phases and the full deployment of the system. The paper will also provide background results on ground segment related trade-offs in terms of performance, cost and risk assessment underlying the preliminary ground segment architecture choices and the main design drivers. To this extend, aspects of coverage of satellites by the TT&C & ULS networks and the sensor network will be addressed. The requirements for the communication network will be described and the performance targets of the major ground segment provided core data products (ephemeris, clock up-dates, signal-in space accuracy estimates and integrity information) will be explained.
Published in:	Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002) September 24 - 27, 2002 Oregon Convention Center Portland, OR
Pages:	2135 - 2147
Cite this article:	Lugert, Manfred, Falcone, Marco, Claes, Peter, Castro, Antonio, Matussi, Sandro, Martinez-Rosique, Juan-Antonio, Manteiga, Miguel, Blonski, Daniel, "Galileo Ground Segment for Navigation and Integrity," Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002), Portland, OR, September 2002, pp. 2135-2147.
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