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Chapter 1: Overview 5

3. The MTSAT Satellite-Based Augmentation System (MSAS). Being

developed by the Japan Civil Aviation Bureau (JCAB) for civil avia-

tion use.

The area covered by the WAAS system includes the entire United States

of America but also extends to a much wider area as detailed below.

Figure 1-2: WAAS Coverage Map

The combination of the WAAS, EGNOS and MSAS systems will

provide global satellite based differential GPS augmentation into the

future.

How it Works

The following description is based on WAAS, but the principles apply

equally to the EGNOS and MSAS systems.

WAAS comprises the following components:

• Ground Reference Stations across the USA.

• Master Stations located at East Coast and West Coast.

• Geostationary Satellites located above the equator.

The Ground Reference Stations are located at known positions and

receive data continuously from GPS. The Ground Reference Stations

send their data to the Master Stations which calculate the error of the

GPS-received positions and generate correctional data.

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