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WAAS Future and Evolutions
| WAAS | |
|---|---|
| Title | WAAS Future and Evolutions |
| Author(s) | GMV |
| Level | Basic |
| Year of Publication | 2011 |
The Wide Area Augmentation System (WAAS) is the United States Satellite Based Augmentation System. The programme, started in 1992, is being carried out by the Federal Aviation Agency (FAA)[1] and is specially developed for the civil aviation community.[2] The system, which was declared operational in late 2003,[3] currently supports thousands of aircraft instrument approaches in more than one thousand airports in USA and Canada.[4] WAAS service area includes CONUS, Alaska, Canada and Mexico.[5] The WAAS programme is continuously in evolution; two development phases have been already covered, a third is in progress, and there are plans to improve the capability of the system in parallel with the evolution of the SBAS standards towards a dual-frequency augmentation service.[6]
WAAS Future and Evolutions
The WAAS Development Phases are:[7][8][9][10]
- Phase I –Initial Operating Capability (IOC). Completed in 2003.
- Phase II -Full LPV Performance. Completed in 2008.
- Phase III -Full LPV-200 Performance. Planned for 2009-2013.
- Phase IV -Dual Frequency Operations. Planned for 2014-2028.
Phase III, currently under development, implies the following changes:[7][10]
- Technology refresh covering development, modifications, and enhancements in the system.
- Steady state operations and maintenance, such as replacement of legacy WRSs, router upgrades,...
- Space segment upgrades, with the broadcast of WAAS signal-in-space form a a third GEO satellite, Inmarsat AMR (PRN #133), since November 2010, complementing Galaxy 15 (PRN #135) and Anik F1R (PRN #138).
- Begin GPS L5 activities: specifications, planning, definition of interfaces and standards, receiver development, etc.
For Phase IV, WAAS shall begin to operate with Dual Frequency (L1-L5). This would imply:[7][10]
- Complete the transition to SBAS L1/L5 dual frequency service.
- Provision of the SBAS-L1 single-frequency legacy service until 2028.
- Maintain a robust, reliable, and sustainable LPV-200 capability.
- Maintenance of the LPV-200 capability, paying special attention to its robustness and reliability.
- High availability performance, with steady operations and smooth maintenance.
- Improve service during severe solar activity.
Notes
References
- ^ Navigation Services - History - Satellite Navigation, FAA.
- ^ Navigation Services - Wide Area Augmentation System (WAAS), FAA.
- ^ Wide Area Differential GPS (WADGPS), Stanford University
- ^ GNSS - GPS/WAAS Approaches, Federal Aviation Agency (FAA).
- ^ WAAS Service Expanded into Canada and Mexico, September 28, 2007, Federal Aviation Agency (FAA).
- ^ SatNav News, Vol. 33, March 2008, Federal Aviation Agency (FAA).
- ^ a b c WAAS and LAAS Status,FAA presentation at 47th meeting of the Civil Global Positioning System Service Interface Committee, September 25, 2008
- ^ WAAS Program Update, 2011, FAA
- ^ Wide Area Augmentation System in Wikipedia
- ^ a b c U.S. GPS Policy and Constellation Status, 5th International Satellite Navigation Forum Moscow, Russia June 1-2, 2011, by U.S. Department of State