SBAS L1/L5 Signal Design Options

M. Tran, C. Hegarty, A.J. Van Dierendonck, T. Morrissey

Abstract:	The third civil GPS signal, L5, includes a data-less component that is allocated 50 percent of the total L5 signal power. This power allocation was optimized for a 50 Hz navigation data rate. Several Satellite-based Augmentation Systems (SBAS) are planning to provide a future signal at the L5 frequency (as they currently do on the GPS L1 frequency). Since the SBAS L5 signals will provide data at higher rate (250 or 500 bps), equally splitting power between an inphase (I) data channel and a quadraphase (Q) data-less channel as is done with the GPS L5 signals, may well not be optimal. Several SBAS L5 signal design options are considered in this paper, including various allocations of power between the data and data-less signal components. Both 250 bps and 500 bps data rates are considered in this paper. Future options for the SBAS L1 signals will also be presented that maintain the legacy signal design in one component (the I channel) and a second data stream in an independent Q channel to provide the possibility of higher data rates on L1 to accommodate future navigation systems such as Galileo. Legacy GPS and SBAS receivers would not be affected.
Published in:	Proceedings of the 59th Annual Meeting of The Institute of Navigation and CIGTF 22nd Guidance Test Symposium (2003) June 23 - 25, 2003 Hyatt Regency Hotel Albuquerque, NM
Pages:	507 - 517
Cite this article:	Tran, M., Hegarty, C., Van Dierendonck, A.J., Morrissey, T., "SBAS L1/L5 Signal Design Options," Proceedings of the 59th Annual Meeting of The Institute of Navigation and CIGTF 22nd Guidance Test Symposium (2003), Albuquerque, NM, June 2003, pp. 507-517.
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