u-blox 6

Do not use the linear extrapolation feature together with a u-blox ADR sensor-based Dead
Reckoning GPS solution, as it will dilute the result!
3 SBAS Configuration Settings Description
3.1 SBAS (Satellite Based Augmentation Systems)
SBAS (Satellite Based Augmentation System) is an augmentation technology for GPS, which calculates GPS
integrity and correction data with RIMS (Ranging and Integrity Monitoring Stations) on the ground and uses
geostationary satellites (GEOs) to broadcast GPS integrity and correction data to GPS users. The correction data
is transmitted on the GPS L1 frequency (1575.42 MHz), and therefore no additional receiver is required to
make use of the correction and integrity data.
SBAS Principle
There are several compatible SBAS systems available or in development all around the world:
• WAAS (Wide Area Augmentation System) for North America has been in operation since 2003.
• MSAS (Multi-Functional Satellite Augmentation System) for Asia has been in operation since 2007.
• EGNOS (European Geostationary Navigation Overlay Service) is at the time of writing in test mode.
• GAGAN (GPS Aided Geo Augmented Navigation), developed by the Indian government is at the time of
writing in test mode.
SBAS support allows u-blox GPS technology to take full advantage of the augmentation systems that are
currently available (WAAS, EGNOS, MSAS), as well as those being tested and planned (such as GAGAN).
With SBAS enabled the user benefits from additional satellites for ranging (navigation). u-blox GPS technology
uses the available SBAS Satellites for navigation just like GPS satellites, if the SBAS satellites offer this service.
To improve position accuracy SBAS uses different types of correction data:
• Fast Corrections for short-term disturbances in GPS signals (due to clock problems, etc).
• Long-term corrections for GPS clock problems, broadcast orbit errors etc.
GPS.G6-SW-10018-A Public Release Page 4 of 201