The BaSE (Bavarian security receiver) project is a response of Bavarian companies to the interest arising toward the Public Regulated Service (PRS) of coming Galileo. Galileo PRS is a special navigation service intended for governmental and governmental authorized users, e.g. police, border control, emergency, armed forces and Search and Rescue (SAR), as well as operators of critical infrastructures like telecommunication- and energy-networks and critical transports. This service is one of the Galileo services to be provided from the beginning of the system operation. The first PRS signals will be available after the launch of the first Galileo IOV satellites in October 2011. These signals can be received on two Galileo frequency bands, E1 and E6 (see figure below), with restricted access for specific authorized users. A PRS receiver has to deliver robust, reliable and continuous position information even under challenging signal conditions, for example in jammed environments, requiring a high robustness against radio frequency interference (RFI). The receiver has also to be able to distinguish between the genuine Galileo signals and their manipulated copies which can be used to intentionally spoof the receiver. Additionally, the means to control the use of Galileo signals within a local/regional area of operation may be required. All these issues make the PRS receiver development a very demanding task.
Within the BaSE (Bavarian security receiver) project, a consortium consisting of six Bavarian (Germany) companies and research institutes was formed to investigate core technologies, acquire necessary know-how, and develop a high-end Galileo PRS receiver prototype. The consortium consists of Fraunhofer Institute for Integrated Circuits (IIS), Institute of Communications and Navigation of German Aerospace Center (DLR), IABG, EADS Astrium, NavCert and Siemens. The project is co-financed and supported by the Bavarian Ministry of Economic Affairs. BaSE has started in February 2010 and will finish with a demonstration of the PRS prototype receiver in January 2012.
Such an efficient cooperation is essential especially for the development of PRS receivers, which is associated with time-consuming processes related not only to security accreditation and certification but also to the subsequent integration of navigation equipment in dedicated platforms with specific environmental and security requirements. Further the use of PRS is ¬ in contrast to GPS PPS ¬ not only limited to military users, but also allowed for other governmental or governmental authorized users. Most of these “new” user communities do not have the same level of experience with security-related equipment as the military users; therefore, a dedicated security-architecture has to be chosen to allow a user-friendly handling of PRS-receivers.
The technological objective of BaSE project is to develop a flexible and scalable high-performance Galileo PRS prototype receiver. Special attention is given to robust acquisition and tracking of the BOCc-modulated PRS signals. Effective suppression of jamming and interference is achieved by combining different approaches like application of an adaptive, two frequency antenna array with a post-correlation beamforming. Further objectives are a robust PVT solution (Position-Velocity-Time) with multi-frequency RAIM (Receiver Autonomous Integrity Monitoring) and spoofing detection by estimating direction of arrival.
Bavarian Ministry of Economic Affairs (STMWIVT).
Fraunhofer Institute for Integrated Circuits (IIS) – project coordination
 A. Ruegamer et al. “A Bavarian Initiative towards a Robust Galileo PRS Receiver”, Proceedings of ION GNSS 2011, 19.-23. Sept. 2011, Portland, Oregon, USA. http://elib.dlr.de/71147/1/BaSE_Paper_final_ION.pdf
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