Integrated GNSS and Mobile Communication Terminal (NAVCOM)

G. Rohmer, M. Overbeck, J. Seybold, M. Restle, G. Heinrichs, S. Haas and J.-M. Sevrin

Abstract:	The objective of the presented NAVCOM project is the development and demonstration of an integrated navigation/mobile communication user terminal based on the TETRAPOL system. TETRAPOL is a fully-secured digital communication standard designed to meet the growing needs and expectations of highly-demanding Professional Mobile Radio (PMR) users such as public safety forces, transport or industry. The European Geostationary Navigation Overlay Service (EGNOS) will be used to improve and augment the service of the satellite navigation system GPS to improve the availability of signals (99 %) and to achieve a horizontal positioning error (95 %) of 3 to 5 meters. A main development activity within the project is the design of a suitable low power GPS/EGNOS navigation module which can receive the EGNOS data either from the EGNOS satellites or via the communication network from a GPS/EGNOS reference receiver located close to the TETRAPOL basestation. This communication assisted GPS/EGNOS receiver will have a highly increased availability of the EGNOS data e.g. in urban environments. The receiver will be implemented as a two-chip solution. The RF-frontend will be realized in a 0.35 um SiGe BiCMOS technology, the digital baseband processing part in a 0.35 um CMOS technology. The selected architecture of the frontend is a Low-IF architecture with a chosen IF frequency of 4 MHz. Thus the receiver under development will have a very low power dissipation and do not need any external filter except the first RF filter. The digital IC consists of a configurable 32 bit RISC core from ARC integrated on-chip in combination with specified hardware modules (digital filtering, demodulation and correlation) to reduce the power consumption. The necessary signal acquisition and tracking is partly realized in hardware and software. All software components including the navigation software will run on a real-time-operating-system specified for security applications.
Published in:	Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004) September 21 - 24, 2004 Long Beach Convention Center Long Beach, CA
Pages:	1515 - 1522
Cite this article:	Rohmer, G., Overbeck, M., Seybold, J., Restle, M., Heinrichs, G., Haas, S., Sevrin, J.-M., "Integrated GNSS and Mobile Communication Terminal (NAVCOM)," Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004), Long Beach, CA, September 2004, pp. 1515-1522.
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