Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Galileo satellite arrives at ESA-ESTEC for testing

03.08.2005


One of the two Galileo satellites currently under development, GSTB-V2/A, has arrived at ESA’s European Space Research and Technology Centre to undergo testing.

Two satellites are being developed for the Galileo System Test Bed – Version 2, which will make up the first phase of in the ’in-orbit validation’ of the Galileo system.

The primary mission of the first Galileo satellites is to secure the Galileo frequency filings, validate new technologies for operational use, characterise the radiation environment of the medium earth orbits that the operational satellites will occupy and enable experimentation with live Galileo signals.



Galileo is a global navigation satellite infrastructure under civil control. It is a joint initiative of the European Commission and ESA.

The satellite

The GSTB-V2/A spacecraft is being developed by Surrey Satellite Technology Ltd (SSTL), based in The United Kingdom. It is a 3-axis stabilized satellite with a body measuring 1.3 m × 1.8 m × 1.65 m and it has a lift-off mass of about 600 kg. Seven hundred Watts of electrical power will be provided by two sun-tracking solar arrays each 1.74 m long when deployed.

The satellite will carry a payload that will transmit a Galileo experimental signal. Main elements of the payload are:

  • An antenna, comprising a phased array of individual L-band elements, illuminating all the visible Earth below the satellite
  • Two signal generation units, one able to generate a simple Galileo signal, and the other able to generate more representative Galileo signals
  • Two Rubidium atomic clocks

The expected satellite lifetime is two years.

Test campaign

ESA maintains a large centre for the testing of space vehicles and their subsystems at its European Space Research and Technology Centre (ESTEC), located at Noordwijk in The Netherlands. The ESTEC Test Centre has the capability of simulating the conditions that spacecraft will experience during launch and once they are in space. ESA will conduct the GSTB-V2/A testing on behalf of the spacecraft manufacturer.

The tests that GSTB-V2/A will undergo include:

  • Space environment simulation – the satellite will be placed in ESTEC’s Large Space Simulator (LSS), where its performance in the cold and vacuum of space can be assessed.
  • Solar array deployment – the solar arrays will be unfolded to confirm correct functioning of the deployment mechanisms and the systems that keep them stowed during launch.
  • Shock and vibration – the spacecraft will be subjected to vibration and mechanical shocks during launch and separation from the launcher. An electrodynamic shaker will simulate this environment to ensure that the satellite can withstand it.
  • Acoustic – at lift-off and during the early part of its journey into space, the satellite is exposed to intense noise. The Large European Acoustic Facility will simulate this environment to check that the spacecraft will not be damaged by the noise.
  • Electromagnetic compatibility – to ensure that the various spacecraft systems do not affect one another’s correct functioning through radio signals emitted intentionally or by electrical interference
    GSTB-V2/A has had the instrument sensors needed for the first sequence of tests installed and it has been placed in the LSS ready for the start of thermal vacuum and thermal balance testing.

The future

The other of the two Galileo satellites, GSTB-V2/B, made by the European consortium Galileo industries, is currently being assembled and tested at the premises of Alenia Spazio in Rome, prior to moving to ESTEC for final testing in the autumn.

The first Galileo launch is scheduled for December this year. The satellite will be carried into space from the Baikonur cosmodrome in Kazakhstan by a Soyuz launcher.

Dominique Detain | alfa
Further information:
http://www.esa.int/esaNA/SEMQXI808BE_galileo_0.html

More articles from Physics and Astronomy:

nachricht X-ray photoelectron spectroscopy under real ambient pressure conditions
28.06.2017 | National Institutes of Natural Sciences

nachricht New photoacoustic technique detects gases at parts-per-quadrillion level
28.06.2017 | Brown University

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Can we see monkeys from space? Emerging technologies to map biodiversity

An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.

Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...

Im Focus: Climate satellite: Tracking methane with robust laser technology

Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.

Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...

Im Focus: How protons move through a fuel cell

Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.

As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...

Im Focus: A unique data centre for cosmological simulations

Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.

With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...

Im Focus: Scientists develop molecular thermometer for contactless measurement using infrared light

Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine

Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Plants are networkers

19.06.2017 | Event News

Digital Survival Training for Executives

13.06.2017 | Event News

Global Learning Council Summit 2017

13.06.2017 | Event News

 
Latest News

Supersensitive through quantum entanglement

28.06.2017 | Physics and Astronomy

X-ray photoelectron spectroscopy under real ambient pressure conditions

28.06.2017 | Physics and Astronomy

Mice provide insight into genetics of autism spectrum disorders

28.06.2017 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>