Satellite Based Augmentation System

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Service areas of the Satellite Based Augmentation Systems

A Satellite Based Augmentation System ( SBAS ; German  satellite-based augmentation system ) is a satellite navigation system , the other existing satellite navigation systems such. B. GPS or GNSS in general. SBAS provides additional information that is broadcast by geosynchronous (mostly geostationary ) satellites and increases the reliability, accuracy and availability of position determination.

Systems

The following SBAS exist or are in the process of being set up, which are primarily intended for use in the flight navigation area, but are also used far beyond:

WAAS Wide area augmentation system North America in operation
EGNOS European Geostationary Navigation Overlay Service Europe in operation
MSAS Multi-functional Satellite Augmentation System Japan in operation
GAGAN GPS Aided Geo Augmented Navigation India in operation
SDKM System for differential correction and monitoring Russia under construction
QZSS-SAIF Quasi-zenith satellite system Japan under construction

These systems use the same data format and similar signals, making SBAS-enabled receivers suitable for all of these systems. The recipient receives the following information:

  • Plausibility of the GNSS signals,
  • Corrections for GNSS satellite clocks and orbits,
  • Corrections for ionospheric propagation delays based on a data grid.

With the help of this information, the receiver can improve its effective position accuracy considerably from about 10 meters to up to one meter. In addition, the signals that use the GPS-L1 frequency and have GPS-C / A code-like properties can be used for pseudorange measurements, i.e. directly improve the availability of GNSS by imitating an additional system satellite.

Satellites

SBAS system satellite Orbit position PRN no. comment
former SBAS satellites (selection)
WAAS Inmarsat -3F4 / AOR-W 142.0 ° W. 122 previously at 54.0 ° W, until 2007
WAAS Inmarsat-3F3 / POR 178.0 ° E 134 until 2007
EGNOS Inmarsat-3F5 / IOR 64.0 ° E 131 Test run until 2004
EGNOS Artemis 21.5 ° E 124
EGNOS Inmarsat-3F5 / IOR-W 25.0 ° E 126 2006-2009
EGNOS Inmarsat-4F2 / IOR-W 25.0 ° E 126
GAGAN Inmarsat-4F1 / IOR 64.0 ° E 127 Test run 2007/08
currently active SBAS satellites (October 2012)
WAAS Intelsat Galaxy XV 133.0 ° W 135
WAAS TeleSat Anik F1R 107.3 ° W 138
WAAS Inmarsat-4F3 98.0 ° W 133
EGNOS Inmarsat-3F2 / AOR-E 15.5 ° W 120
EGNOS SES-5 5 ° E 136
EGNOS Astra-5B 31.5 ° E 123 Test operation
GAGAN GSAT -8 55.0 ° E 127 Test operation
QZSS-SAIF QZS-1 135.0 ° E 183 HEO orbit , inclination 43 °, test operation
MSAS MTSAT-1R 140.1 ° E 129 uses z. T. also PRN 137
MSAS MTSAT-2 145.0 ° E 137 uses z. T. also PRN 129
SDKM sucking -5A 95 ° E 140 Test operation, GPS / GLONASS
future SBAS satellites (selection)
SDKM Suck-5B 16 ° W 125 launched on November 2, 2012, GPS / GLONASS
SDKM Suck-5V 167 ° E 141 Start ~ 2014, GPS / GLONASS
GAGAN GSAT-10 83.0 ° E 128 started on September 21, 2012

Other services

There are other, essentially commercial services that could also be referred to in a broader sense as SBAS:

  • Starfix from Fugro ,
  • Trimble's OmniSTAR ,
  • StarFire from John Deere ,
  • Atlas L-Band from Hemisphere GNSS
  • various services from Veripos.

These services also use geostationary satellites to send out additional information. However, they use different signals and data formats so that these services are not freely accessible and no additional pseudo-distance measurements can be carried out. On the other hand, the achievable accuracies of the position determination are sometimes significantly higher ( decimeter range).