GIOVE-A test campaign completed
The test campaign using the large antenna at Chilbolton Observatory to analyse the navigation signals transmitted by GIOVE-A, the first Galileo satellite, has been successfully completed.
ΑΡΧΕΙΟΘΕΤΗΜΈΝΟ ΠΕΡΙΕΧΌΜΕΝΟ
10 ΣΕΠ. 2007
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GIOVE-B, the second experimental satellite in the Galileo Programme, has arrived at ESA's European Space Research and Technology Centre in Noordwijk, The Netherlands, for its final tests.
An industrial consortium led by EADS Astrium GmbH was responsible for the construction of GIOVE-B. The satellite's main purpose is to secure the availability of the Galileo Signal-In-Space (SIS) after GIOVE-A reaches the end of its service life, which is expected to occur in March 2008.
Compared with GIOVE-A, GIOVE-B will fly new on-board technologies such as:
a passive hydrogen maser, used as a precise time reference
a different type of navigation signal generator
solid-state radio transmitters
a different design of L-band antenna to broadcast the navigation signals
an alternative type of radiation monitor to continue characterising the environment in medium-Earth orbit
The combined in-orbit experience gained with GIOVE-A and GIOVE-B will constitute an invaluable resource for the Galileo In-Orbit Validation (IOV) programme and for the completion of the operational Galileo satellites.
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The GIOVE-B spacecraft has recently completed its thermal vacuum test, which simulated the heating and cooling conditions it will encounter in space, at the Thales-Alenia Space facilities in Rome. It has been delivered to the European Space Research and Technology Centre (ESTEC) for final testing in the ESTEC Test Centre.
The final test campaign will include:
vibration and acoustic tests
an electromagnetic compatibility test and passive intermodulation tests
electrical fit checks with the launcher adapter
a solar array deployment test
interface tests with the ground operations centre, under the responsibility of Telespazio
alignment checks
propulsion subsystem functional tests
final satellite-level performance tests
At the end of the test campaign at ESTEC, currently expected in mid-November 2007, the satellite will be transported to the Baikonur Cosmodrome in Kazakhstan. There, the launch campaign will be commenced, leading to a launch by the end of the year aboard a Soyuz-Fregat launcher.
In 2009, the first two satellites of the operational Galileo constellation will be launched, followed by the second two operational satellites in 2010. They will be used for in-orbit verification of the Galileo system design before being joined by the 26 additional spacecraft required for full operations by the end of 2013.
Galileo is a joint initiative between ESA and the European Commission. When fully deployed in the early years of the next decade, it will be the first civilian positioning system to offer global coverage.
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First Colloquium on Scientific and Fundamental Aspects of the Galileo Programme
Enhancing the scientific use of Galileo and contributing to GNSS development based on scientific approaches are among the goals of the international colloquium on fundamental aspects and scientific applications of Galileo and GNSS that will be held in Toulouse from 1 until 4 October 2007 at the ‘Cité de l'Espace’.
Galileo rubidium clocks – a year of in-orbit experience
Europe’s first satellite-borne rubidium clocks have been in orbit for over a year. There is good news for the building of the Galileo system: the results obtained from GIOVE-A’s first year of operations show performance that is largely in line with the specifications.
GIOVE-A transmits first navigation message
Earlier this week, GIOVE-A successfully transmitted its first navigation message, containing the information needed by user receivers to calculate their position. Prior to reaching this milestone, the satellite had been broadcasting only the data needed for measuring the receiver-to-satellite distance.
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Σχετικοί σύνδεσμοι
Galileo website (European Commission)
European GNSS Agency, GSA
EADS Astrium
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