Required Data Rate for an SBAS L5 Signal

T. McKendree, D. Cormier, J. Studenny

Abstract:	RTCA is developing a new SBAS ICD that will include the signal specification for a new SBAS L5 signal. The primary early focus is on the physical layer. In order to finalize the design of the physical layer, it is necessary to decide upon the information data rate of the signal, including potential signal options. The paper identifies key factors that significantly drive the SBAS L5 data rate needs. Such key factors include the number and size of GNSS constellations the SBAS system will report upon, the use or not of dynamic PRN mask, the need and rate of any fast corrections, and the approach for providing ionosphere information. This paper estimates the data rate needed for an SBAS L5 signal for a number of scenarios. These estimates are scaled off WAAS operations, adjusting for the key factors that drive data rate needs. The estimates are presented with an accuracy equivalent to the main alternatives from the physical layer design efforts for message data rates. The required data rates fit well with a physical layer implementation of 250 message bps, with a growth option to 500 bps.
Published in:	Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003) September 9 - 12, 2003 Oregon Convention Center Portland, OR
Pages:	2812 - 2818
Cite this article:	McKendree, T., Cormier, D., Studenny, J., "Required Data Rate for an SBAS L5 Signal," Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003), Portland, OR, September 2003, pp. 2812-2818.
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