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==WAAS Messages== | ==WAAS Messages== | ||
For a detailed description of SBAS Messages, see article [[EGNOS Messages]]. This articles follows the standard described in RTCA MOPS DO-229-C “''Minimum Operational Performance Standards for Global Positioning System/Wide Area Augmentation System airborne equipment''” (particularly in its Appendix A “''Signal characteristics and format''”), applicable for every Satellite Based Augmentation Systems (SBAS). In the article, SBAS Message specification is also compliant with the ICAO SARPs “Standards and Recommended Practices”, Appendix B “Detailed technical specifications for the Global Navigation Satellite System (GNSS)”. These two standards are nearly aligned in what regards to the SBAS SiS specification, but the augmentation of GLONASS or other constellations except for GPS is not specified in MOPS, as WAAS does not provides augmentation to GLONASS satellites. | For a detailed description of SBAS Messages, see article [[EGNOS Messages]]. This articles follows the standard described in RTCA MOPS DO-229-C “''Minimum Operational Performance Standards for Global Positioning System/Wide Area Augmentation System airborne equipment''” (particularly in its Appendix A “''Signal characteristics and format''”), applicable for every Satellite Based Augmentation Systems (SBAS). In the article, SBAS Message specification is also compliant with the ICAO SARPs “Standards and Recommended Practices”, Appendix B “Detailed technical specifications for the Global Navigation Satellite System (GNSS)”. These two standards are nearly aligned in what regards to the SBAS SiS specification, but the augmentation of GLONASS or other GNSS constellations except for GPS is not specified in MOPS, the standard that follows WAAS, as WAAS does not provides augmentation to GLONASS satellites. | ||
==Notes== | ==Notes== | ||
Revision as of 12:21, 21 June 2011
| WAAS | |
|---|---|
| Title | WAAS Messages |
| Author(s) | GMV. |
| Level | Basic |
| Year of Publication | 2011 |
The Wide Area Augmentation System (WAAS) is an GPS Augmentation system developed by the Federal Aviation Administration (FAA), with the goal of improving its accuracy, integrity, and availability. Essentially, WAAS is intended to enable aircraft to rely on GPS for all phases of flight, including precision approaches to any airport within its coverage area.
WAAS uses a network of ground-based reference stations, in North America and Hawaii, to measure small variations in the GPS satellites' signals in the western hemisphere. Measurements from the reference stations are routed to master stations, which queue the received Deviation Correction (DC) and send the correction messages to geostationary WAAS satellites in a timely manner (every 5 seconds or better). Those satellites broadcast the correction messages back to Earth, where WAAS-enabled GPS receivers use the corrections while computing their positions to improve accuracy.[1]
WAAS Messages
For a detailed description of SBAS Messages, see article EGNOS Messages. This articles follows the standard described in RTCA MOPS DO-229-C “Minimum Operational Performance Standards for Global Positioning System/Wide Area Augmentation System airborne equipment” (particularly in its Appendix A “Signal characteristics and format”), applicable for every Satellite Based Augmentation Systems (SBAS). In the article, SBAS Message specification is also compliant with the ICAO SARPs “Standards and Recommended Practices”, Appendix B “Detailed technical specifications for the Global Navigation Satellite System (GNSS)”. These two standards are nearly aligned in what regards to the SBAS SiS specification, but the augmentation of GLONASS or other GNSS constellations except for GPS is not specified in MOPS, the standard that follows WAAS, as WAAS does not provides augmentation to GLONASS satellites.