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Jun 23, 2015

Galileo More Successful (March 27, 2015)

The previous two satellites Galileo #5 and #6 (FOC #1 and #2) launched in 2014 ended to wrong orbits due to problems in the launch vehicle (see this article). Now the orbit insertion for Galileo #7 and #8 (FOC #3 and #4) happened flawlessly and brought relief to Europe's GNSS program.

Galileo launch profile

The EU’s Galileo satellite navigation system now (27 March 2015) has eight satellites in orbit following the launch of the latest pair. Galileo 7 and 8 lifted off at 21:46 GMT (22:46 CET, 18:46 local time) on 27 March from Europe’s Spaceport in French Guiana on top of a Soyuz rocket.

All the Soyuz stages performed as planned, with the Fregat upper stage releasing the satellites into their target orbit, around 3 hours 48 minutes after liftoff. Galileo 7 and 8 were launched into a circular 23,522 km altitude orbit about 300 km above their final orbit.

Following initial checks, run jointly by ESA and France’s CNES space agency from the CNES Toulouse centre, the two satellites will be handed over to the Galileo Control Centre in Oberpfaffenhofen, Germany and the Galileo in-orbit testing facility in Redu, Belgium for testing before they are commissioned for operational service. This is expected in mid-year.

Galileo satellite in orbit

The new pair will join the six satellites already launched, in October 2011, October 2012 and August 2014.

“The deployment of the Galileo constellation is restarting with this successful launch,” said Jean-Jacques Dordain, Director General of ESA.

“The tests in orbit of satellites 5 and 6 have demonstrated the quality and performance of the satellites, and the production of the following ones is well on track. Good news for Galileo.”

Four more satellites are in testing or final integration and scheduled for launch later this year.

“With six new satellites expected to be in orbit by year’s end, we are now approaching the cruise mode of production, testing and deployment of the satellite constellation,” said ESA’s Director of Galileo and Navigation-related Activities, Didier Faivre.

30-satellite Galileo constellation

As set by the European Commission, the objective is to deliver a package of Initial Services, including a free Public Service, an encrypted Public Regulated Service and a Search And Rescue function, by 2016, to be transferred to the responsibility of the European Global Navigation Satellite Systems Agency, GSA.

A full system capability that includes an encrypted commercial service benefiting from 24 operational satellites and six spares is expected to be in place by 2020.


YouTube video: "Arianespace Flight VS11 / Galileo Sat 7-8"






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