Tags: ESA, Satellite Navigation System, GPS, Europe
Publication: RedOrbit.com
Publication Date: 12/04/2012

Artist’s rendition of the four Galileo In-Orbit Validation satellites in medium-Earth orbit. This is the minimum number of satellites needed to perform a navigation fix. Image credit: ESA – P. Carril

ESA‘s third Galileo satellite has sent its first test navigation signals back to Earth and broadcasted signals across all three Galileo bands.

There are a total of four Galileo satellites in orbit. The first two were launched in 2011 and have reached their final orbital position; they are currently in the testing phase. The third Galileo satellite (FM3), launched on October 12 together with the fourth one in the fleet, has started its tests by transmitting its first navigation signal in the Open Service E1 band on Sunday. Additionally, the FM3 broadcasted signals across Galileo bands E5 and E6.

The Galileo satellite system is meant to provide highly accurate navigation services around the world. Its satellites orbit the earth in approximately 14 hours at an altitude of 14,400 miles. The spacecraft are being monitored from Germany and Italy.

The fourth Galileo satellite, the FM4, which was launched together with the FM3, is expected to begin tests later this month.

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