The Next Generation WAAS Reference Receiver

Jonathan Auld and Allan Manz

Abstract:	NovAtel has been involved in the development of ground based reference stations since 1995. This was when the first WAAS ground station receivers were fielded. Since then MSAS (Japan), SNAS (China), and EGNOS (Europe) networks have all made the move to use similar receivers. With recent announcements regarding the upgrades to the GPS constellation and the new work starting out on Galileo; the time has come for a new wide area network ground station receiver that can keep up with the changes on the horizon. The new WAAS G-II receiver is based on the NovAtel OEM4 dual frequency GPS receiver. It also includes a new generation of the patented Multipath Estimating Delay Lock Loop (MEDLL®) multipath reduction technology that provides a 50% improvement over the currently fielded algorithm. The design also has provisions for subsequent upgrades to add L5 or Galileo capabilities. The receiver firmware also incorporates Signal Quality Monitoring (SQM) and Digital Pulse Blanking. The hardware and software systems engineering aspects of the new WAAS receiver will be presented, including performance results for the key areas of SQM, Multipath Rejection, and Interference Rejection and compared to the first generation WAAS reference receiver. NovAtel has recently completed design and qualification of the new receiver and production started in April 2004. This receiver will provide added integrity monitoring and expansion capability to match evolving GNSS system updates as they are deployed.
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:	544 - 550
Cite this article:	Auld, Jonathan, Manz, Allan, "The Next Generation WAAS Reference Receiver," Proceedings of the 2005 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2005, pp. 544-550.
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