Geneq SXBlue II Technical Reference Manual page 149

North America. This service falls into the greater category of Space Based
Augmentation System (SBAS).
Upon the successful completion of a 21-day test on August 24, 2000, the Federal
Aviation Administration of the United States of America announced that its Wide Area
Augmentation System (WAAS) would be running 24 hours per day, seven days per
week from then on. Testing has shown since that this signal is accurate and reliable.
Since the date it was commissioned (July 10, 2003), WAAS has undergone a few
changes in its satellite constellation and coverage (PRN 122 and 134 phased out and
replaced by PRN 135 and 138 at new locations; and with the addition of ground
monitoring stations in Canada and Mexico in September 2007). In summer 2010, PRN
133 has been added to the constellation and in late December 2010, PRN 135 was
recovered after being out of control for a few months, bringing the total number of
operational satellites to three.
Other government agencies have followed the pace and developed compatible SBAS
systems for their respective geographic regions. In Europe, the European Space
Agency, the European Commission, and EUROCONTROL have jointly developed the
European Geostationary Overlay System (EGNOS). EGNOS is now fully deployed and
in its pre-operational phase. The system will undergo certification for safety-of-life
applications before becoming fully operational. Furthermore, on June 28, 2007, the
European Space Agency and the Agency for Security of Air Navigation in Africa and
Madagascar have signed a cooperation agreement with the objective of using satellite
navigation to improve air traffic safety over the African continent.
In Japan, the MTSAT Satellite-based Augmentation System (MSAS) has been deployed
by the Japan Civil Aviation Bureau (JCAB). Successful launches of MTSAT-1R and
MTSAT-2 were followed by system integration for MSAS ground system and MTSATs by
transmitting test signal from MTSATs. Purposes of test signal transmission were to
optimize system performance and then to verify that augmentation information meets
safety and performance requirements. Since those tests had been accomplished
successfully, MSAS for aviation use was commissioned on September 27, 2007.
In India, the Indian Space Research Organisation and Airports Authority of India have
successfully completed the final system acceptance test of the GPS Aided GEO
Augmented Navigation system (GAGAN) as announced on November 20, 2007 by
Raytheon Company. With completion of the final system acceptance test, the stage is
set for India to embark on the next phase of the program, which will expand the existing
ground network, add redundancy, and produce the certification analysis and
documentation for safety-of-flight commissioning. The launch of their own
communication satellites is scheduled for May 11, 2011. Note that GAGAN is no longer
broadcasting on Inmarsat 4f1.
China has a similar program for a SBAS and the service is named the Chinese Satellite
Navigation Augmentation System (SNAS).
The SXBlue II GPS is capable of receiving correction data from all compatible SBAS.
Warning – Use of non-commissioned SBAS signals is entirely at your risk and
discretion.
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