Next Generation Satellite Based Augmentation System (SBAS) Signal Specification

A. J. Van Dierendonck, Chris Hegarty, Rick Niles, Tom Morrissey and Pat Reddan

Abstract:	The Satellite Based Augmentation Systems (SBASs) use satellites (geostationary satellites - GEOs) to broadcast Global Navigation Satellite System (GNSS) integrity and correction data to GNSS users, and to provide ranging signals that augment the GNSS. The current SBASs (WAAS, EGNOS and MSAS) broadcast on the GPS L1 frequency to the users, although they also broadcast at another frequency (C-band or Ku-band) to aid signal phase and frequency control. A number of next generation SBASs will broadcast at the GPS L1 and L5 frequencies, in which case the second frequency will also be available to users for signal redundancy as well as providing ionospheric corrections for GEO ranging. This paper describes details of these new SBAS signals. It also describes new receiver design requirements for tracking these new signals. Although it does not describe new (or old) data messages (still in the process of being defined), some new data requirements are discussed. These new data requirements justify the possibility of increasing the signal data rates, providing flexibility for broadcast data required for various regions covered by the future GEOs, commensurate with the capabilities of those future GEOs.
Published in:	Proceedings of the 2005 National Technical Meeting of The Institute of Navigation January 24 - 26, 2005 The Catamaran Resort Hotel San Diego, CA
Pages:	371 - 384
Cite this article:	Van Dierendonck, A. J., Hegarty, Chris, Niles, Rick, Morrissey, Tom, Reddan, Pat, "Next Generation Satellite Based Augmentation System (SBAS) Signal Specification," Proceedings of the 2005 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2005, pp. 371-384.
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