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Arianespace Soyuz ready to launch European GPS satellites
by Staff Writers
Kourou, French Guiana (ESA) Aug 20, 2014


illustration only

"Doresa" and "Milena" - the first two Galileo FOC (Full Operational Capability) satellites - are ready for their ride to orbit this week, as preparations for Arianespace's Soyuz Flight VS09 move into the final stages.

The pair of Galileo satellites and their dispenser system have now been integrated atop the three-stage Soyuz with installation of the medium-lift workhorse vehicle's "upper composite," which also includes the protective payload fairing and the Fregat upper stage.

This activity - which occurred inside the purpose-built mobile gantry at the Soyuz launch complex in French Guiana - follows the upper composite's transfer on a special transporter from the separate S3B payload preparation facility.

These steps complete Arianespace's Soyuz launcher build-up for its August 21 mission, allowing final checkout to commence in preparation for a scheduled liftoff at precisely 9:31:14 a.m. local time in French Guiana on Thursday.

With a liftoff mass of 730 kg. each and a design life of 12 years or more, Doresa and Milena - named for children who won a European Commission-painting contest - are the first in a series of satellites for Galileo's FOC phase, which Arianespace will continue to deploy with its workhorse Soyuz and Ariane 5 vehicles.

Galileo's FOC phase is managed and funded by the European Commission, which delegated the European Space Agency as the program's design and procurement agent on its behalf. Doresa and Milena were built by FOC prime contractor OHB System in Bremen, Germany, with the spacecraft's navigation payloads provided by the UK's Surrey Satellite Technology Ltd.

The Galileo program will offer a civilian-controlled satellite navigation system operated by Europe, becoming another cornerstone in global satellite navigation, while also being interoperable with the U.S. GPS and Russian Glonass systems.

With a constellation of 30 satellites at full deployment, Galileo will determine accurate locations for most places on Earth and - as a result of its overall doubling of available satellites and the spacecraft's positions in orbits at greater inclination to the equatorial plane than GPS - provide better coverage at high latitudes, including Northern Europe.

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