Optimizing Aspects of Eurofix

Durk van Willigen, Edward J. Breeuwer, and Tom P.A. Brogtrop

Abstract:	Euro& is an integrated radionavigation system based on DGNSS and Loran-C. The DGNSS correction data are radioed to the user by additional modulation of the Loran-C bursts. The resulting narrow-band Loran-C data link must be optimized for best performance in respect of DGNSS accuracy in the intended service area. As this data link is also intended for use as an integrity channel, limits are set on maximum message delays and message error rates. The proper functioning of the data link is endangered by continuous wave interference, atmospheric noise and cross-rate interference caused by Loran-C stations from other chains. Eurofix uses the so-calledfilly asynchronous DGNSS message type which gives, considering the slow code-bit rate, very good accuracy performance. The type and the resolution of the applied correction parameters may be optimized for best attainable accuracy. The paper discusses a number of modulation and coding techniques for transmitting the data bits.
Published in:	Proceedings of the 50th Annual Meeting of The Institute of Navigation (1994) June 6 - 8, 1994 Antlers Doubletree Hotel Colorado Springs, CO
Pages:	139 - 147
Cite this article:	van Willigen, Durk, Breeuwer, Edward J., Brogtrop, Tom P.A., "Optimizing Aspects of Eurofix," Proceedings of the 50th Annual Meeting of The Institute of Navigation (1994), Colorado Springs, CO, June 1994, pp. 139-147.
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