Tagged: ESA Galileo Toggle Comment Threads | Keyboard Shortcuts

  • richardmitnick 10:26 am on December 24, 2015 Permalink | Reply
    Tags: , , ESA Galileo   

    From ESA: “Galileos 11 and 12” 

    ESASpaceForEuropeBanner
    European Space Agency

    1
    Credits: ESA/CNES/ARIANESPACE/Optique

    Galileos 11 and 12, mated with their dispenser on top of their Fregat upper stage being encapsulated within their Soyuz fairing.

    The latest Galileo satellites lifted off at 11:51 GMT on 17 December (12:51 CET; 08:51 Kourou time) from Europe’s Spaceport in French Guiana on a Soyuz rocket. They are expected to become operational, after initial in-orbit testing, next spring.

    This is the sixth Galileo launch overall and the third this year, set to bring the number of satellites in space up to 12.

    See the full article here .

    Please help promote STEM in your local schools.

    STEM Icon

    Stem Education Coalition

    The European Space Agency (ESA), established in 1975, is an intergovernmental organization dedicated to the exploration of space, currently with 19 member states. Headquartered in Paris, ESA has a staff of more than 2,000. ESA’s space flight program includes human spaceflight, mainly through the participation in the International Space Station program, the launch and operations of unmanned exploration missions to other planets and the Moon, Earth observation, science, telecommunication as well as maintaining a major spaceport, the Guiana Space Centre at Kourou, French Guiana, and designing launch vehicles. ESA science missions are based at ESTEC in Noordwijk, Netherlands, Earth Observation missions at ESRIN in Frascati, Italy, ESA Mission Control (ESOC) is in Darmstadt, Germany, the European Astronaut Centre (EAC) that trains astronauts for future missions is situated in Cologne, Germany, and the European Space Astronomy Centre is located in Villanueva de la Cañada, Spain.

    ESA50 Logo large

     
  • richardmitnick 2:36 pm on December 15, 2015 Permalink | Reply
    Tags: , , ESA Galileo   

    From ESA: “Galileos in the zone for launch” 

    ESASpaceForEuropeBanner
    European Space Agency

    15 December 2015

    Galileos 11 and 12 are on the launch pad, attached to the top of their Soyuz rocket in readiness for this week’s launch.

    ESA Galileo Spacecraft
    A Galileo spacecraft

    Europe’s next navigation satellites are due for launch at 11:51 GMT (12:51 CET, 08:51 local time) on Thursday from Europe’s Spaceport in French Guiana.

    Last Thursday the two satellites, already attached to their carrier, were fixed to the Fregat upper stage before the halves of the protective Soyuz fairing were closed around them on Friday.

    This marked the completion of the ‘upper composite’ – the combination of Galileo satellites, dispenser and the upper stage that will fly them the bulk of the way up to their medium-altitude orbit.

    2
    Galileo satellites 11 and 12 are mated with their dispenser.
    The latest Galileo satellites are scheduled to lift off at 11:51 GMT on 17 December (12:51 CET; 08:51 Kourou time) from Europe’s Spaceport in French Guiana on a Soyuz rocket. They are expected to become operational, after initial in-orbit testing, next spring.
    This is the sixth Galileo launch overall and the third this year, set to bring the number of satellites in space up to 12.

    Meanwhile, the first three stages of the Soyuz were assembled horizontally, rolled out to the pad and raised to the vertical.

    The upper composite was moved to the pad on Sunday afternoon, hoisted to the top of the tower and then then carefully attached to Soyuz.

    Yesterday’s Launch Readiness Review opened the way to Soyuz fuelling and finally launch.

    This latest Galileo campaign began with the arrival of the satellites in French Guiana on 30 October. This is the sixth Galileo launch overall and the third launch of 2015, set to bring the number of satellites in space up to 12.

    It takes place just 11 days before the 10th anniversary of the liftoff of Europe’s very first navigation satellite.

    The experimental GIOVE-A took off on 28 December 2005 to reserve operational frequencies, test key hardware and gather data on the orbital environment for the Galileo constellation to follow. GIOVE-B followed in April 2008.

    Since then not only has the first third of the Galileo constellation reached orbit, but a network of Galileo ground stations has been erected across the globe.

    In future, the number of satellites that can be inserted into orbit with a single launch will double from two to four, when a customised Ariane 5 rocket becomes available to complement Soyuz.

    See the full article here .

    Please help promote STEM in your local schools.

    STEM Icon

    Stem Education Coalition

    The European Space Agency (ESA), established in 1975, is an intergovernmental organization dedicated to the exploration of space, currently with 19 member states. Headquartered in Paris, ESA has a staff of more than 2,000. ESA’s space flight program includes human spaceflight, mainly through the participation in the International Space Station program, the launch and operations of unmanned exploration missions to other planets and the Moon, Earth observation, science, telecommunication as well as maintaining a major spaceport, the Guiana Space Centre at Kourou, French Guiana, and designing launch vehicles. ESA science missions are based at ESTEC in Noordwijk, Netherlands, Earth Observation missions at ESRIN in Frascati, Italy, ESA Mission Control (ESOC) is in Darmstadt, Germany, the European Astronaut Centre (EAC) that trains astronauts for future missions is situated in Cologne, Germany, and the European Space Astronomy Centre is located in Villanueva de la Cañada, Spain.

    ESA50 Logo large

     
  • richardmitnick 9:30 am on November 9, 2015 Permalink | Reply
    Tags: , , ESA Galileo,   

    From ESA: “Galileo satellites set for year-long Einstein experiment” 

    ESASpaceForEuropeBanner
    European Space Agency

    9 November 2015

    Javier Ventura-Traveset
    ESA Global Navigation Satellite Systems Senior Advisor
    Email: Javier.ventura-traveset@esa.int

    Dr Pacôme Delva
    SYRTE, Observatoire de Paris
    Email: pacome.delva@obspm.fr

    Dr Sven Hermann
    ZARM Center of Applied Space Technology and Microgravity
    Email: sven.herrmann@zarm.uni-bremen.de

    ESA Galileo Spacecraft
    ESA/Galileo satellites

    Europe’s fifth and sixth Galileo satellites – subject to complex salvage manoeuvres following their launch last year into incorrect orbits – will help to perform an ambitious year-long test of Einstein’s most famous theory.

    Galileos 5 and 6 were launched together by a Soyuz rocket on 22 August 2014. But the faulty upper stage stranded them in elongated orbits that blocked their use for navigation.

    ESA’s specialists moved into action and oversaw a demanding set of manoeuvres to raise the low points of their orbits and make them more circular.

    2
    Corrected Galileo orbits

    “The satellites can now reliably operate their navigation payloads continuously, and the European Commission, with the support of ESA, is assessing their eventual operational use,” explains ESA’s senior satnav advisor Javier Ventura-Traveset.

    “In the meantime, the satellites have accidentally become extremely useful scientifically, as tools to test Einstein’s General Theory of Relativity by measuring more accurately than ever before the way that gravity affects the passing of time.”

    Although the satellites’ orbits have been adjusted, they remain elliptical, with each satellite climbing and falling some 8500 km twice per day.

    It is those regular shifts in height, and therefore gravity levels, that are valuable to researchers.

    Albert Einstein predicted a century ago that time would pass more slowly close to a massive object. It has been verified experimentally, most significantly in 1976 when a hydrogen maser atomic clock on Gravity Probe A was launched 10 000 km into space, confirming the prediction to within 140 parts in a million.

    4
    Galileo maser clock

    3
    Gravity Probe A

    Atomic clocks on navigation satellites have to take into account they run faster in orbit than on the ground – a few tenths of a microsecond per day, which would give us navigation errors of around 10 km per day.

    “Now, for the first time since Gravity Probe A, we have the opportunity to improve the precision and confirm Einstein’s theory to a higher degree,” comments Javier.

    “This increased precision is of great interest because it will test several alternative theories of gravity.”

    This new effort takes advantage of the passive hydrogen maser atomic clock aboard each Galileo, the elongated orbits creating varying time dilation, and the continuous monitoring thanks to the global network of ground stations.

    “Moreover, while the Gravity Probe A experiment involved a single orbit of Earth, we will be able to monitor hundreds of orbits over the course of a year,” explains Javier.

    “This opens up the prospect of gradually refining our measurements by identifying and removing errors. Eliminating those errors is actually one of the big challenges.

    “For that we count on the support of Europe’s best experts in Europe plus precise tracking from the International Global Navigation Satellite System Service, along with tracking to centimetre accuracy by laser.”

    The results are expected in about one year, projected to quadruple the accuracy on the Gravity Probe A results.

    The two teams devising the experiments are Germany’s ZARM Center of Applied Space Technology and Microgravity, and France’s Systèmes de Référence Temps-Espace, both specialists in fundamental physics research.

    ESA’s forthcoming Atomic Clock Ensemble in Space experiment, planned to fly on the International Space Station in 2017, will go on to test Einstein’s theory down to 2–3 parts per million.

    See the full article here .

    Please help promote STEM in your local schools.

    STEM Icon

    Stem Education Coalition

    The European Space Agency (ESA), established in 1975, is an intergovernmental organization dedicated to the exploration of space, currently with 19 member states. Headquartered in Paris, ESA has a staff of more than 2,000. ESA’s space flight program includes human spaceflight, mainly through the participation in the International Space Station program, the launch and operations of unmanned exploration missions to other planets and the Moon, Earth observation, science, telecommunication as well as maintaining a major spaceport, the Guiana Space Centre at Kourou, French Guiana, and designing launch vehicles. ESA science missions are based at ESTEC in Noordwijk, Netherlands, Earth Observation missions at ESRIN in Frascati, Italy, ESA Mission Control (ESOC) is in Darmstadt, Germany, the European Astronaut Centre (EAC) that trains astronauts for future missions is situated in Cologne, Germany, and the European Space Astronomy Centre is located in Villanueva de la Cañada, Spain.

    ESA50 Logo large

     
  • richardmitnick 8:58 am on September 25, 2015 Permalink | Reply
    Tags: , , ESA Galileo   

    From ESA: “Galileo satellites handed over to operator” 

    ESASpaceForEuropeBanner
    European Space Agency

    25 September 2015

    ESA Galileo Spacecraft
    Galileo Spacecraft

    Europe’s latest pair of Galileo satellites has passed its initial check out in space, allowing control to be handed over to the main control centre and join the growing fleet.

    “This was a beautifully smooth start to the mission,” comments ESA mission director, Richard Lumb.

    “From liftoff through to handover to the constellation operator and beyond, this has been a textbook performance not only of the satellites but also for all the operations and manufacturer teams on the ground.”

    Galileos 9 and 10 were launched on the morning of 11 September. Their individual lives began within four hours, as they separated from their rocket’s final stage, overseen from ESA’s ESOC operations centre in Darmstadt, Germany.

    Days of round-the-clock effort followed, to bring the satellites to life, beginning with closely monitoring the unfolding of their solar wings and their pointing towards the Sun.

    The various satellite elements were methodically switched on, their health checked and readied for work.

    2
    Controlling Galileo

    Liviu Stefanov, an ESA flight director, described the process as “one of the smoothest yet.”

    The satellites fired their thrusters to drift towards their target orbital positions at around 23 222 km altitude – helped along in this case by a near-perfect orbital injection to begin with.

    Firings will resume around the end of October to stop the drift and achieve fine positioning in orbit, guided by ESOC’s specialist flight dynamics team.

    The accuracy of the Galileo system relies on the orbital position of its satellites being fixed to a very high level of precision.

    3
    Galileo control centre

    Once on their way, the satellites were handed over on 19 and 20 September, respectively, to the Galileo Control Centre in Oberpfaffenhofen, Germany managed by SpaceOpal.

    The team of engineers from ESA and France’s CNES space agency are preparing for the next launch, scheduled for December. The early phase for Galileos 11 and 12 will be overseen from CNES in Toulouse, France, which alternates with ESOC as hosts.

    The navigation payloads on Galileos 9 and 10 still need to undergo detailed testing, led from ESA’s Redu centre in Belgium with the support of both Oberpfaffenhofen and the second Galileo Control Centre in Fucino, Italy, which has oversight of Galileo’s navigation mission.

    This phase ensures the latest satellites’ navigation and search and rescue payloads are operating normally, giving them a clean bill of health before they can join the Galileo constellation.

    See the full article here .

    Please help promote STEM in your local schools.

    STEM Icon

    Stem Education Coalition

    The European Space Agency (ESA), established in 1975, is an intergovernmental organization dedicated to the exploration of space, currently with 19 member states. Headquartered in Paris, ESA has a staff of more than 2,000. ESA’s space flight program includes human spaceflight, mainly through the participation in the International Space Station program, the launch and operations of unmanned exploration missions to other planets and the Moon, Earth observation, science, telecommunication as well as maintaining a major spaceport, the Guiana Space Centre at Kourou, French Guiana, and designing launch vehicles. ESA science missions are based at ESTEC in Noordwijk, Netherlands, Earth Observation missions at ESRIN in Frascati, Italy, ESA Mission Control (ESOC) is in Darmstadt, Germany, the European Astronaut Centre (EAC) that trains astronauts for future missions is situated in Cologne, Germany, and the European Space Astronomy Centre is located in Villanueva de la Cañada, Spain.

    ESA50 Logo large

     
  • richardmitnick 7:03 am on March 26, 2015 Permalink | Reply
    Tags: , , ESA Galileo   

    From ESA: “Galileo satellites enclosed for Friday’s launch” 

    ESASpaceForEuropeBanner
    European Space Agency

    25 March 2015
    No Writer Credit

    1
    Galileos enclosed

    Thousands of engineers have worked on the seventh and eighth navigation satellites of Europe’s Galileo constellation in recent years, but last Friday marked the very last time the spacecraft were glimpsed by human eyes.

    The team from ESA and builders OHB in the S3B building of Europe’s Spaceport in French Guiana looked on as the focus of their work disappeared from view.

    The pair of satellites – already resting atop their Fregat upper stage and attached to their dispenser – was enclosed within the halves of the Soyuz rocket’s protective fairing.

    This unit was moved yesterday to the launch site, where it will be lifted atop the first three stages of the Soyuz ST-B to complete the vehicle for Friday’s launch.

    2
    Heading to launch pad

    Last week saw the two satellites being fuelled in the Spaceport’s S5A preparation hall and then brought together atop the dispenser that will support them during the rigours of ascent.

    The dispenser’s final task is to release them in opposite directions once their 22 522 km-altitude orbit is reached. The satellites themselves will then gradually lower themselves to their working 22 322 km orbit.

    After fuelling, the satellites plus dispenser were moved to the S3B processing building, where their Fregat was already fuelled and waiting.

    3
    Galileo’s Soyuz

    The reignitable Fregat is as much a spacecraft as a rocket stage. Once the Soyuz reaches low orbit, Fregat will take over the task of hauling the satellites higher through a pair of burns.

    The two Galileos and their dispenser altogether weigh more than one and a half tonnes, so the attachment operation took place with great care and precision.

    Then the fairing halves were slowly slid into place around them and closed. Enclosed in this way, the satellites will be protected from the harsh slipstream and vibration of the first few moments of launch, when the Soyuz is still travelling through the thickest layers of atmosphere.

    4
    Inside fairing

    The fairing is due to be ejected 3 min 29 sec after liftoff.

    Until liftoff, the satellites remain connected to the outside world via power and data links, allowing ESA’s Galileo team keep a check on their battery charging and the health of their atomic clocks.

    The satellites stay switched off during launch, and will be activated automatically on separation from the dispenser.

    Launch is due at 21:46:18 GMT (22:46:18 CET, 18:46:18 local time) on 27 March. The satellites are scheduled for release upon reaching their set orbit 3 h 47 min 57 sec after launch.

    See the full article here.

    Please help promote STEM in your local schools.

    STEM Icon

    Stem Education Coalition

    The European Space Agency (ESA), established in 1975, is an intergovernmental organization dedicated to the exploration of space, currently with 19 member states. Headquartered in Paris, ESA has a staff of more than 2,000. ESA’s space flight program includes human spaceflight, mainly through the participation in the International Space Station program, the launch and operations of unmanned exploration missions to other planets and the Moon, Earth observation, science, telecommunication as well as maintaining a major spaceport, the Guiana Space Centre at Kourou, French Guiana, and designing launch vehicles. ESA science missions are based at ESTEC in Noordwijk, Netherlands, Earth Observation missions at ESRIN in Frascati, Italy, ESA Mission Control (ESOC) is in Darmstadt, Germany, the European Astronaut Centre (EAC) that trains astronauts for future missions is situated in Cologne, Germany, and the European Space Astronomy Centre is located in Villanueva de la Cañada, Spain.

    ESA50 Logo large

     
  • richardmitnick 8:31 am on December 4, 2014 Permalink | Reply
    Tags: , , , , ESA Galileo   

    From ESA: Galileo Satellite Recovered and Transmitting Navigation Signals” 

    ESASpaceForEuropeBanner
    European Space Agency

    3 December 2014
    No Writer Credit

    Europe’s fifth Galileo satellite, one of two delivered into a wrong orbit by VS09 Soyuz-Fregat launcher in August, has transmitted its first navigation signal in space on Saturday 29 November 2014. It has reached its new target orbit and its navigation payload has been successfully switched on.

    g
    Galileo

    A detailed test campaign is under way now the satellite has reached a more suitable orbit for navigation purposes.

    Recovery

    The fifth and sixth Galileo satellites, launched together on 22 August, ended up in an elongated orbit travelling up to 25 900 km above Earth and back down to 13 713 km.

    A total of 11 manoeuvres were performed across 17 days, gradually nudging the fifth satellite upwards at the lowest point of its orbit.

    As a result, it has risen more than 3500 km and its elliptical orbit has become more circular.

    “The manoeuvres were all normal, with excellent performance both in terms of thrust and direction,” explained Daniel Navarro-Reyes, ESA Galileo mission analyst.

    o
    Galileo satellite’s revised orbit

    “The final orbit is as we targeted and is a tribute to the great professionalism of all the teams involved.”

    The commands were issued from the Galileo Control Centre by Space Opal, the Galileo operator, at Oberpfaffenhofen in Germany, guided by calculations from a combined flight dynamics team of ESA’s Space Operations Centre, ESOC, in Darmstadt, Germany and France’s CNES space agency.

    The commands were uploaded to the satellite via an extended network of ground stations, made up of Galileo stations and additional sites coordinated by France’s CNES space agency.

    Satellite manufacturer OHB also provided expertise throughout the recovery, helping to adapt the flight procedures.

    Until the manoeuvres started, the combined ESA–CNES team maintained the satellites pointing at the Sun using their gyroscopes and solar sensors. This kept the satellites steady in space but their navigation payloads could not be used reliably.

    In the new orbit, the satellite’s radiation exposure has also been greatly reduced, ensuring reliable performance for the long term.

    A suitable orbit

    The revised, more circular orbit means the fifth satellite’s Earth sensor can be used continuously, keeping its main antenna oriented towards Earth and allowing its navigation payload to be switched on.

    Significantly, the orbit means that it will now overfly the same location on the ground every 20 days. This compares to a normal Galileo repeat pattern of every 10 days, effectively synchronising its ground track with the rest of the Galileo constellation.

    c
    Controlling Galileo

    The navigation test campaign

    The satellite’s navigation payload was activated on 29 November, to begin the full ‘In-Orbit Test’ campaign. This is being performed from ESA’s Redu centre in Belgium, where a 20 m-diameter antenna can study the strength and shape of the navigation signals at high resolution.

    “First, the various payload elements, especially the Passive Hydrogen Maser atomic clock, were warmed up, then the payload’s first ‘signal in space’ was transmitted,” said David Sanchez-Cabezudo, managing the test campaign.

    “The satellite-broadcast L-band navigation signal is monitored using the large antenna at Redu, with experts from OHB and Surrey Satellite Technology Ltd – the payload manufacturer, based in Guildford, UK – also on hand to analyse how it performs over time.”

    The first Galileo FOC navigation signal-in-space transmitting in the three Galileo frequency bands (E5/E6/L1) was tracked by Galileo Test User Receivers deployed at various locations in Europe, namely at Redu (B), ESTEC (NL), Weilheim (D) and Rome (I). The quality of the signal is good and in line with expectations.

    The Search And Rescue (SAR) payload will be switched on in few days in order to complement the in-orbit test campaign.

    v
    Galileo L-band antenna at Redu

    The way forward

    The same recovery manoeuvres are planned for the sixth satellite, taking it into the same orbital plane but on the opposite side of Earth.

    The decision whether to use the two satellites for Navigation and SAR purposes as part of the Galileo constellation will be taken by the European Commission based on the test results.

    About Galileo

    Galileo is Europe’s own global satellite navigation system. It will consist of 30 satellites and their ground infrastructure.

    The definition phase and the development and In-Orbit Validation phase of the Galileo programme were carried out by the European Space Agency (ESA) and co-funded by ESA and the European Union. This phase has created a mini-constellation of four satellites and a reduced ground segment dedicated to validating the overall concept.

    The four satellites launched during the IOV phase form the core of the constellation that is being extended to reach Full Operational Capability (FOC).

    The FOC phase is fully funded by the European Commission. The Commission and ESA have signed a delegation agreement by which ESA acts as design and procurement agent on behalf of the Commission.

    Learn more about Galileo at: http://www.esa.int/Our_Activities/Navigation

    See the full article here.

    Please help promote STEM in your local schools.

    STEM Icon

    Stem Education Coalition

    The European Space Agency (ESA), established in 1975, is an intergovernmental organization dedicated to the exploration of space, currently with 19 member states. Headquartered in Paris, ESA has a staff of more than 2,000. ESA’s space flight program includes human spaceflight, mainly through the participation in the International Space Station program, the launch and operations of unmanned exploration missions to other planets and the Moon, Earth observation, science, telecommunication as well as maintaining a major spaceport, the Guiana Space Centre at Kourou, French Guiana, and designing launch vehicles. ESA science missions are based at ESTEC in Noordwijk, Netherlands, Earth Observation missions at ESRIN in Frascati, Italy, ESA Mission Control (ESOC) is in Darmstadt, Germany, the European Astronaut Centre (EAC) that trains astronauts for future missions is situated in Cologne, Germany, and the European Space Astronomy Centre is located in Villanueva de la Cañada, Spain.

    ESA50 Logo large

     
  • richardmitnick 1:35 pm on November 6, 2013 Permalink | Reply
    Tags: , , , , ESA Galileo   

    From ESA: “Galileo put to the test” 

    ESASpaceForEuropeBanner
    European Space Agency

    Europe’s next pair of Galileo satellites have been the focus of a busy autumn at ESA’s technical centre in the Netherlands, continuing a full-scale campaign to ensure their readiness for space.

    With the first four Galileos already in orbit, these new versions are the first two of a total 22 ‘Full Operational Capability’ satellites being built by OHB in Germany with a payload from Surrey Satellite Technology Ltd in the UK.

    The second satellite joined its predecessor in mid-August at ESA’s European Space Research and Technology Centre in Noordwijk. This is the largest spacecraft testing site in Europe, with a full range of space simulation facilities under a single roof in cleanroom conditions. A wide range of tests have been performed on the two satellites.

    gal1
    Galileo Full Operational Capability Flight Model 2, FM2, satellite’s main L-band antenna used for broadcasting navigation messages, seen during preparation for a mass property test at the ESTEC Test Centre at the end of August 2013. Credits: ESA-Anneke Le Floc’h

    gal2
    The first two Galileo Full Operational Capability (FOC) satellites seen together at the ESTEC Test Centre on 30 August 2013. The second flight model, FM2, is in the foreground to the left with the first, FM1, in the background to the right.
    Credits: ESA-Anneke Le Floc’h

    gal3
    The main antenna of the second Galileo Full Operational Capability (FOC) satellite being inspected with a flashlight in advance of mass property testing during August 2013. Credits: ESA-Anneke Le Floc’h

    See the full article with more images here.

    The European Space Agency (ESA), established in 1975, is an intergovernmental organization dedicated to the exploration of space, currently with 19 member states. Headquartered in Paris, ESA has a staff of more than 2,000. ESA’s space flight program includes human spaceflight, mainly through the participation in the International Space Station program, the launch and operations of unmanned exploration missions to other planets and the Moon, Earth observation, science, telecommunication as well as maintaining a major spaceport, the Guiana Space Centre at Kourou, French Guiana, and designing launch vehicles. ESA science missions are based at ESTEC in Noordwijk, Netherlands, Earth Observation missions at ESRIN in Frascati, Italy, ESA Mission Control (ESOC) is in Darmstadt, Germany, the European Astronaut Centre (EAC) that trains astronauts for future missions is situated in Cologne, Germany, and the European Space Astronomy Centre is located in Villanueva de la Cañada, Spain.


    ScienceSprings is powered by MAINGEAR computers

    gal4
    Checking the underside of the second Galileo Full Operational Capability satellite with a flashlight in advance of mass property testing in August 2013. Credits: ESA-Anneke Le Floc’h

     
  • richardmitnick 11:59 am on July 11, 2013 Permalink | Reply
    Tags: , , ESA Galileo   

    From ESA: “Galileo spreads its wings” 

    ESASpaceForEuropeBanner
    European Space Agency

    11 July 2013
    No Writer Credit

    “Deployment of the solar wings on the latest Galileo satellite is shown being checked at ESA’s technical hub in the Netherlands. The navigation satellite’s pair of 1 x 5 m solar wings, carrying more than 2500 state-of-the-art gallium arsenide solar cells, will power the satellite during its 12-year working life.

    wings
    Galileo FOC solar wing deployment. No image credit

    A counterweighted rig supports the deployment, otherwise the delicate fold-out wings – designed for the weightlessness of space – would crumple under the pull of Earth gravity.

    With the first four Galileo ‘In-Orbit Validation’ satellites already in orbit, this is the first of the rest of Europe’s satnav constellation.

    These Full Operational Capability satellites provide the same operational services as their predecessors, but they are built by a new industrial team: OHB in Bremen, Germany build the satellites with Surrey Satellite Technology Ltd in Guildford, UK contributing the navigation payloads.

    There are also a lot more of them: this satellite is only the first of 22 ordered from OHB. It arrived at ESA’s ESTEC research and technical centre in Noordwijk in mid-May to begin a rigorous campaign of testing in simulated launch and space conditions, guaranteeing its readiness for launch.”

    See the full article here.

    The European Space Agency (ESA), established in 1975, is an intergovernmental organization dedicated to the exploration of space, currently with 19 member states. Headquartered in Paris, ESA has a staff of more than 2,000. ESA’s space flight program includes human spaceflight, mainly through the participation in the International Space Station program, the launch and operations of unmanned exploration missions to other planets and the Moon, Earth observation, science, telecommunication as well as maintaining a major spaceport, the Guiana Space Centre at Kourou, French Guiana, and designing launch vehicles. ESA science missions are based at ESTEC in Noordwijk, Netherlands, Earth Observation missions at ESRIN in Frascati, Italy, ESA Mission Control (ESOC) is in Darmstadt, Germany, the European Astronaut Centre (EAC) that trains astronauts for future missions is situated in Cologne, Germany, and the European Space Astronomy Centre is located in Villanueva de la Cañada, Spain.

    ESA Technology


    ScienceSprings is powered by MAINGEAR computers

     
  • richardmitnick 7:20 am on March 13, 2013 Permalink | Reply
    Tags: , , ESA Galileo   

    From ESA: “Galileo fixes Europe’s position in history” 

    ESASpaceForEuropeBanner
    European Space Agency

    12 March 2013
    No Writer Credit

    Europe’s new age of satellite navigation has passed a historic milestone – the very first determination of a ground location using the four Galileo satellites currently in orbit together with their ground facilities.

    ESA Galileo Spacecraft
    Galileo

    This fundamental step confirms the Galileo system works as planned.

    A minimum of four satellites is required to make a position fix in three dimensions. The first two were launched in October 2011, with two more following a year on.

    ‘Once testing of the latest two satellites was complete, in recent weeks our effort focused on the generation of navigation messages and their dissemination to receivers on the ground, explained Marco Falcone, ESA’s Galileo System Manager.

    This first position fix of longitude, latitude and altitude took place at the Navigation Laboratory at ESA’s technical heart ESTEC, in Noordwijk, the Netherlands on the morning of 12 March, with an accuracy between 10 and 15 metres – which is expected taking into account the limited infrastructure deployed so far.”

    gal

    See the full article here.

    The European Space Agency (ESA), established in 1975, is an intergovernmental organization dedicated to the exploration of space, currently with 19 member states. Headquartered in Paris, ESA has a staff of more than 2,000. ESA’s space flight program includes human spaceflight, mainly through the participation in the International Space Station program, the launch and operations of unmanned exploration missions to other planets and the Moon, Earth observation, science, telecommunication as well as maintaining a major spaceport, the Guiana Space Centre at Kourou, French Guiana, and designing launch vehicles. ESA science missions are based at ESTEC in Noordwijk, Netherlands, Earth Observation missions at ESRIN in Frascati, Italy, ESA Mission Control (ESOC) is in Darmstadt, Germany, the European Astronaut Centre (EAC) that trains astronauts for future missions is situated in Cologne, Germany, and the European Space Astronomy Centre is located in Villanueva de la Cañada, Spain.


    ScienceSprings is powered by MAINGEAR computers

     
c
Compose new post
j
Next post/Next comment
k
Previous post/Previous comment
r
Reply
e
Edit
o
Show/Hide comments
t
Go to top
l
Go to login
h
Show/Hide help
shift + esc
Cancel
Follow

Get every new post delivered to your Inbox.

Join 582 other followers

%d bloggers like this: