Wide Area Augmentation System (WAAS) and NDGPS Update · Wide Area Augmentation System (WAAS) and...
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Wide Area Augmentation System (WAAS) and NDGPS
Update
Deborah Lawrence FAA Navigation Programs Manager
November 2015
10th Meeting of the International Committee on GNSS
Boulder, CO, U.S.
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Current WAAS GEO Coverage
SatMex 9 at 117ºW
Future WAAS GEO Coverage
AMR at 98ºW
WAAS GEO Footprints
CRE at 107ºW CRW at 133ºW
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WAAS Phase IV Dual Frequency Operations Status
• Transition from use of L2 P(Y) to L5 – Planned ‘Sunset’ of L2P(Y) is driver for transition
• Phase IV Segment 1 consists of 5 Releases – Release 1 (Processor Upgrades) currently on
schedule to be complete by summer of 2017 – Release 2 (GEO 5) on schedule for operational GEO
by the end of CY2017 • Dual-Frequency Multi-constellation Capability
(DFMC) – MOPS and SARPs development underway
• Advanced RAIM (ARAIM) – Concept definition underway to look at avionics
centric approach for use of multi-constellation GNSS
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Procedures & Users Depending on WAAS
• Approximately 85,500 WAAS equipped aircraft • All classes of aircraft are served in all phases of flight • Enabling technology for NextGen programs
– Automatic Dependent Surveillance Broadcast (ADS-B) – Performance Based Navigation (PBN)
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• Procedures – As of October 15, 2015
4,186 WAAS Procedures published
• 3,590 LPV procedures • 596 LP procedures
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Future of Nationwide Differential GPS (NDGPS)
• Current system utilizes 84 broadcast sites to provide positioning accuracy of 1-3 meters across 92% of CONUS
• Few users of the NDGPS broadcast • USCG, DOT, and US Army Corps of Engineers Plans: – Retain NDGPS at 21 sites for single station near-shore
coverage – Decommission 62 sites – One US Army Corps of Engineers (USACE) site to remain
• Termination of NDGPS broadcast at 62 proposed sites planned for Jan. 15, 2016*
* November 16, 2015: 90-day FRN comment period closes; Impact and alternative site use assessed
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Proposed NDGPS Coverage with 62 Sites Decommissioned
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