GPS Aided Geo Augmented Navigation
The GPS Aided Geo Augmented Navigation ( GAGAN ) is an Indian satellite navigation system that is supposed to provide satellite-based correction signals for the Global Positioning System in India . With EGNOS in Europe, MSAS in Japan and WAAS in North America, it forms a system to support satellite-based navigation, especially in air traffic.
In 2007/2008 a successful test operation was carried out using the Inmarsat satellite 4-F1 to transmit the GAGAN signals generated on the ground.
The attempt to bring GAGAN's first payload GSAT-4 into orbit failed on April 15, 2010 due to a false start of the GSLV launcher. In contrast, the launch of the GSAT-8 satellite with an Ariane rocket from Kourou on May 20, 2011 was successful. This satellite is positioned at 55 degrees East. Its GAGAN signals use PRN 127. Another satellite ( GSAT-10 ) was successfully launched on September 28, 2012, also with an Ariane 5 . The positioning was at 83 ° East and he uses the PRN code 128.
Web links
- International Union of Radio Science: Development of Grid Based Model for GAGAN (PDF; 84 kB)
- United Nations Office for Outer Space Affairs: Indian Satellite Navigation Program: An Update (PDF; 2.4 MB)
Global Systems
Historically:
Transit ·
Parus / Zikada
In operation:
GPS ·
GLONASS ·
Galileo ·
BeiDou-2
Regional systems or regional supplementary systems
Historically:
BeiDou-1
Under construction:
QZSS ·
IRNSS 
Supporting satellite-based systems ( SBAS )
In operation:
WAAS ·
MSAS ·
EGNOS
Under construction:
GAGAN ·
QZSS-SAIF ·
SDKM
See also list of navigation satellites