* Astronomy

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RE: GIOVE-B satellite

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GIOVE-B hydrogen atomic clock ticks through three years in orbit

Three years after ESA's Galileo prototype GIOVE-B reached orbit, the passive hydrogen maser at its heart is still ticking away as the most precise atomic clock ever flown in space for navigation that is, until the first Galileo satellites join it later this year.
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Galileo: Failure to Launch
The European satellite navigation system Galileo was once envisioned to make the continent independent of the US military-run GPS system, unite European states with a prestigious industry and policy project, and establish Europe as a major player in space. But faced with growing costs and expensive delays, many wonder whether Galileo will ever fulfil these high expectations.

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The European Space Agency (ESA) is hosting a workshop today that will present the findings of the in orbit verification and early experimentation from the GIOVE-A and GIOVE-B satellites. SSTLs Galileo team, led by Elizabeth Rooney, is supporting the workshop and will be presented with an award in recognition of SSTLs outstanding contribution to the success of the Galileo programme.

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Galileo satellite knocked offline
A test spacecraft for Europe's future satellite-navigation system has been rocked by a surge of space radiation.

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SSTL has completed an in-orbit test campaign analysing signals from the new GIOVE-B satellite for ESA. The results suggest that GIOVE-B is operating well and in turn validates technologies integral to the EU-funded Galileo Satellite Navigation project.

Having conducted several in-orbit test campaigns for GIOVE-A, ESA invited the SSTL team to support their GIOVE-B in-orbit test campaign. We are delighted to contribute to this further Galileo milestone - Elizabeth Rooney, SSTLs GIOVE project manager.

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Following a successful launch on 27 April, GIOVE-B began transmitting navigation signals today. This is a truly historic step for satellite navigation since GIOVE-B is now, for the first time, transmitting the GPS-Galileo common signal using a specific optimised waveform, MBOC (multiplexed binary offset carrier), in accordance with the agreement drawn up in July 2007 by the EU and the US for their respective systems, Galileo and the future GPS III.

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A demonstrator satellite for Europe's proposed Galileo satellite navigation system is "in good health" despite a glitch shortly after launch.
Controllers were unable to use their preferred method for turning the spacecraft and instead had to fire the thruster engines - which wastes fuel.
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Giove B Soyuz Preparation

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Giove B Launch

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The European Union on Sunday is to launch the second satellite in its much-delayed Galileo navigation system designed to rival the American GPS system.

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