TESEO-LIV3F datasheet(12/37 Pages) STMICROELECTRONICS

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Augmentation systems

Teseo-LIV3F

12/37

DS12152 Rev 7

Augmentation systems

3.1

Satellite-Based augmentation system

Teseo-LIV3F supports SBAS. SBAS is a Wide Area Differential GPS (WADGPS), it’s a

system which provides differential GPS corrections data; SBAS includes the WAAS within

the United States, the EGNOS within Europe, the Multifunctional Transport Satellite

(MTSAT)–based MSAS within Japan and Southeast Asia, and the GPS and GEO

Augmented Navigation (GAGAN) system in India.

SBAS data correction is used in the GNSS algorithm to provide a better position estimation.

The overall SBAS differential correction mechanism can be conceived as built in 2 phases:



The “Acquire and Tracking” phase



The “Decoding” phase

The “Acquire and Track” phase relates to the capacity of the acquisition engine to reliably

track the configured SBAS satellite; during decoding phase the SBAS message can be

decoded to fetch the differential corrections.

The current longitude limits for each service are:



WAAS -180 to -25 degrees



EGNOS -25 degrees to +50 degrees



GAGAN +50 degrees to +100 degrees



MSAS +100 degrees to +180 degrees

The Teseo-LIV3F software with SBAS capability implements a command interface at the

NMEA level to allow interaction with the SBAS library. It supports commands to

enable/disable the SBAS functionality.

3.2

QZSS

The Quasi-Zenith Satellite System (QZSS) is a Japanese regional communication service

and positioning information for the mobile environment in the GPS L1C/A band. QZSS in

conjunction with GPS signals provides GNSS augmentation service for the Pacific region

covering Japan and Australia. QZSS satellites are placed in a periodic Highly Elliptical Orbit

(HEO): these orbits allow the satellites to “dwell” for more than 12 hours a day at an

elevation above 70° (it means that they appear almost overhead most of the time).

3.3

Differential GPS

Teseo-LIV3F supports Differential-GPS data according to RTCM (Radio Technical

Commission for Maritime Services) 2.3.

Differential-GPS data improves position accuracy.

Teseo-LIV3F supports the following RTCM message.

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