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Virtual Dictionary

MSAS

MSAS, or Multi-functional Satellite Augmentation System is a GPS augment developed by the Japanese to network together air-based, ground-based and satellite based GPS stations to triangulate precise positions from all of them, enabling a reliable GPS fix in three dimensions rather than just two.

MSAS corrects for GPS signal errors caused by ionospheric disturbances, timing, and satellite orbit errors, giving accuracy in X, Y, and Z axis accurate to within 3 metres, in real-time. This makes it ideal for fast-moving objects such as planes, to track their precise location constantly.

As a nice side-effect, MSAS is able to report on satellite conditions. If one drifts out of orbit, the system picks this up immediately as its GPS telemetry for other objects disagrees with the rest of the network stations.

MSAS is compatible with basic GPS signal structure.

Whilst MSAS is only applicable for the Asian continent, other geographic areas are developing their own systems, which are inter-compatible. .For the US, it's the Wide Area Augmentation System (WAAS), while Europe has the Euro Geostationary Navigation Overlay Service (EGNOS).

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Related Dictionary Entries for MSAS:

Acquisition Time

EGNOS

MSAS

Satellite-Based Augmentation System

SBAS

WAAS

Wide Area Augmentation System









 

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