Multi-functional Satellite Augmentation System (MTSAT orMSAS)[1] is a Japanesesatellite based augmentation system (SBAS), i.e. asatellite navigation system which supportsdifferential GPS (DGPS) to supplement theGPS system by reporting (then improving) on the reliability and accuracy of those signals. MSAS is operated by Japan'sMinistry of Land, Infrastructure and Transport andCivil Aviation Bureau (JCAB). MSAS was commissioned for aviation use on 27 September 2007.[citation needed]
The use of SBASs, such as MSAS, enables an individual GPS receiver to correct its own position, offering a much greater accuracy. Typically GPS signal accuracy is improved from some 20 meters to approximately 1.5–2 meters in both the horizontal and vertical dimensions.[2]
| Satellite Name & Details | NMEA / PRN | Location | Launched |
|---|---|---|---|
| MTSAT-1R (Himawari 6)[3] | NMEA #42 / PRN #129 | 140°E | 26 February 2005 |
| MTSAT-2 (Himawari 7)[4] | NMEA #50 / PRN #137 | 145°E | 18 February 2006 |
MSAS provides a similar service toWide Area Augmentation System (WAAS) in North America,European Geostationary Navigation Overlay Service (EGNOS) in Europe andSystem for Differential Corrections and Monitoring (SDCM) in Russia.
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