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sci.geo.satellite-nav (Global Satellite Navigation) (sci.geo.satellite-nav) Discussion of global navigation satellite systems (GNSS). Topics include the technical aspects of GNSS operation, user experiences in the use of GNSS, information regarding GNSS products and discussion of GNSS policy (such as GPS selective availability).

Trouble Aboard Galileo Satellite



 
 
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  #1  
Old July 2nd 14, 10:15 PM posted to sci.geo.satellite-nav
Sam Wormley[_2_]
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Posts: 775
Default Trouble Aboard Galileo Satellite

Trouble Aboard Galileo Satellite
http://gpsworld.com/trouble-aboard-galileo-satellite/


Speculation by unofficial sources is mounting that something is wrong
with the satellite, in particular with its passive hydrogen maser,
used for timing the signal for synchronous transmission with other
Galileo satellites. The hydrogen maser has “a known problem”
according to one source. This is why the web site shows GSAT0104,
also known as FM04 and E2, as currently using a rubidium atomic
frequency standard


  #2  
Old July 8th 14, 11:44 PM posted to sci.geo.satellite-nav
Sam Wormley[_2_]
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Posts: 775
Default Trouble Aboard Galileo Satellite


Power Loss Created Trouble Aboard Galileo Satellite
http://gpsworld.com/trouble-aboard-galileo-satellite/


In an update to our July 2 story (recapped below), correspondent
Peter de Selding wrote in Space News on July 3 that the trouble
aboard the fourth in-orbit (IOV) Galileo satellite arose from a
sudden, unexpected loss of power. The power outage flashed on May 27,
shutting down the satellite’s E1 signal. The signal “re-established
itself almost immediately. But as soon as it was back in service, the
two other channels’ power dropped and did not recover. The full
satellite then was shut down by ground teams,” reported de Selding.




 




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