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 From the cosmos to fusion plasmas, PPPL presents findings at global APS gathering
13.11.2018 | DOE/Princeton Plasma Physics Laboratory

nachricht A two-atom quantum duet
12.11.2018 | Institute for Basic Science

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: A Chip with Blood Vessels

Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.

Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...

Im Focus: A Leap Into Quantum Technology

Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.

In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...

Im Focus: Research icebreaker Polarstern begins the Antarctic season

What does it look like below the ice shelf of the calved massive iceberg A68?

On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.

Im Focus: Penn engineers develop ultrathin, ultralight 'nanocardboard'

When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure

Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...

Im Focus: Coping with errors in the quantum age

Physicists at ETH Zurich demonstrate how errors that occur during the manipulation of quantum system can be monitored and corrected on the fly

The field of quantum computation has seen tremendous progress in recent years. Bit by bit, quantum devices start to challenge conventional computers, at least...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

“3rd Conference on Laser Polishing – LaP 2018” Attracts International Experts and Users

09.11.2018 | Event News

On the brain’s ability to find the right direction

06.11.2018 | Event News

European Space Talks: Weltraumschrott – eine Gefahr für die Gesellschaft?

23.10.2018 | Event News

 
Latest News

The dawn of a new era for genebanks - molecular characterisation of an entire genebank collection

13.11.2018 | Life Sciences

Fish recognize their prey by electric colors

13.11.2018 | Life Sciences

Ultrasound Connects

13.11.2018 | Awards Funding

VideoLinks
Science & Research
Overview of more VideoLinks >>>