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Signal Transmission by MSAS
Signal Transmission by
MTSAT Satellite-based Augmentation System (MSAS)
September 27 2007
The Japan Civil Aviation Bureau (JCAB) had been implementing the MTSAT Satellite-based Augmentation System (MSAS) to utilize GPS for aviation.
MSAS provides GPS augmentation information to aircraft through MTSAT (Multi-functional Transport Satellite) located at 36000km above the ground over the equator (geostationary earth orbit).
MSAS generates GPS augmentation information by analyzing signals from GPS satellites received by monitor stations on the ground. This augmentation information consists of GPS-like ranging signal and correction information on GPS errors caused by the satellites themselves or by the ionosphere.
MSAS signal provides accurate, stable and reliable GPS position solutions to aircraft. This leads to a considerable improvement in the safety and reliability of GPS positioning, which, therefore, enables the aviation users who are under very strict safety regulations to use GPS positioning as a primary means of navigation system.
Successful launches of MTSAT-1R and MTSAT-2 were followed by system integration of MSAS ground system and MTSATs by transmitting test signal via MTSATs. Purposes of the test signal transmission were to optimize system performance and then to verify that the augmentation information met safety and performance requirements.
Since those tests had been accomplished successfully, MSAS for aviation use was commissioned on September 27, 2007.
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