Sea Trials, Message Delay, and Network Design for DGPS Radiobeacons

Michael F. Ruane, Per K. Enge, Katharyn Olson, David J. Pietraszewski

Abstract:	Medium frequency coastal marine radiobeacons potentially offer an inexpensive alternative for transmitting DGPS correction messages using a digitally modulated subcarrier. Recent USCG sea trials using a radiobeacon broadcasting RTCM SC-104 messages have shown good performance out to the beacon's rated coverage range of 125 mi. Operation up to 325 mi was possible, depending on atmospheric conditions. In a separate study of message delays for various baud rates and atmospheric noise levels, it was found that a rate 1/2 code gives better overall performance than higher rate codes. Finally, a network reliability analysis has shown that redundant land communications can significantly reduce the probability of outage at short beacon ranges. but have Jess impact at longer ranges.
Published in:	Proceedings of the 2nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1989) September 27 - 29, 1989 The Broadmoor Hotel Colorado Spring, CO
Pages:	325 - 332
Cite this article:	Ruane, Michael F., Enge, Per K., Olson, Katharyn, Pietraszewski, David J., "Sea Trials, Message Delay, and Network Design for DGPS Radiobeacons," Proceedings of the 2nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1989), Colorado Spring, CO, September 1989, pp. 325-332.
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