Subscribe free to our newsletters via your
  GPS News  

Subscribe free to our newsletters via your

Galileo signals covering more of the sky
by Staff Writers
Paris (ESA) Feb 03, 2016

To pinpoint your location accurately, your receiver needs to receive signals from at least four navigational satellites. The receiver determines your distance from each of the satellites by measuring the time taken by the signal to travel from the satellite to your receiver antenna. Image courtesy ESA. For a larger version of this image please go here.

Europe's ninth and tenth Galileo satellites have started broadcasting working navigation messages. These two satellites were launched together on 11 September last year. Once safely in orbit and their systems activated, their navigation payloads and search and rescue transponders were subjected to a rigorous process of in-orbit testing, to ensure their performance reached the necessary specifications to become part of the Galileo system.

Radio-frequency measurements of the Galileo signals were made from ESA's Redu centre in Belgium. The site boasts a 20 m-diameter dish to analyse their signal shape in high resolution. Along with assessing that the satellites themselves were functioning as planned, the test campaign also confirmed they could mesh properly with the worldwide Galileo ground network.

The testing was coordinated from the Galileo Control Centres in Oberpfaffenhofen in Germany - performing the command and control of the satellites - and Fucino in Italy - overseeing the provision of navigation messages to users.

"This is the first recurrent launch of Galileo Full Operational Capability satellites from an In-Orbit Test point of view," comments Christian Lezy, supervising the measurement campaign in Redu. "All tests were conducted in a seamless manner in parallel with the ongoing routine operations of the rest of the fleet."

The operations team, successfully led by SpaceOpal GmbH, completed the testing campaign few days ahead of schedule, with the satellites beginning to broadcast valid navigation signals on 29 January.

The following two Galileos - satellites 11 and 12, launched on 17 December last year - are currently undergoing their own in-orbit test campaign. Once their initial 'Launch and Early Operations Phase' was completed at the Toulouse facility of France's CNES space agency, both spacecraft were handed over to the Oberpfaffenhofen centre during the Christmas period.

'Platform commissioning and drift stop and fine positioning' manoeuvres have also been completed - placing both satellites into their final working orbits - while their payload activation is proceeding according to schedule.

Galileo satellites 13 and 14 have completed all pre-flight testing at ESA's ESTEC test centre in Noordwijk, the Netherlands, and have been put into storage ahead of their launch.

Production of the remaining 12 satellites is continuing around the clock at OHB's facility in Bremen, Germany.

The complete Galileo constellation will be made up of 24 satellites across three orbital planes, with two 'active spare' satellites per orbital plane, ready to plug any gap in service should an operational Galileo malfunction.

At the moment the satellites are transmitting navigation signals for technical validation purposes, being employed by Galileo engineers as well as the rest of the satnav industry to prepare Galileo-compatible products and services.

The current status of the overall Galileo constellation can be checked from the European Commission's European GNSS Service Centre website here.


Related Links
Paris (ESA) Feb 03, 2016
GPS Applications, Technology and Suppliers

Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks DiggDigg RedditReddit GoogleGoogle

Previous Report
Harris Corporation to offer fully digital GPS III payload
Melbourne, FL (SPX) Feb 01, 2016
Harris Corporation has announced that it will offer an all-digital navigation payload for GPS III Space Vehicles (SV) 11 and beyond. Harris' fully digital navigation payload will add value to the U.S. Air Force's GPS mission by offering enhanced performance and enabling on-orbit reprogramming. The all-digital payload expands on the advanced features of the current 70-percent digital soluti ... read more

Transgenic plants' 'die and let live' strategy dramatically increases drought resistance

China jails employees of US food firm over meat scandal

How 'more food per field' could help save our wild spaces

Improved harvest for small farms thanks to naturally cloned crops

Scientists build a neural network using plastic memristors

A step towards keeping up with Moore's Law

Switchable material could enable new memory chips

Molecular-like photochemistry from semiconductor nanocrystals

Japan unveils first stealth fighter jet

Rolls-Royce to provide engines, propulsion support for C-130Js

Japan reveals first domestic stealth aircraft

Carpet-bombing in IS fight against 'our values': US general

Renault opens first China factory

Dutch test first self-drive minibuses

Bumpy road ahead for electric cars: Tesla boss

Germany approves scandal-hit VW's recall plan for 2.0-litre cars

Russian tourism in Turkey crumbles after plane downing

Fincantieri signs framework accords with Iranian companies

Japan's 2015 trade deficit narrows as oil prices tumble

Kerry in Laos to discuss bomb legacy and ASEAN partnership

Study documents drought's impact on redwood forest ferns

Canada protects ancient Pacific coast forest from logging, hunting

Landscape pattern analysis reveals global loss of interior forest

Over-hunting threatens Amazonian forest carbon stocks

JPL researchers report on new tool to provide even better Landsat images

NASA awards imaging Instruments contract Polar Follow-On satellite

Russia to launch Resurs-P satellite on March 12

NASA awards infrared instrument for next polar satellite

Novel nanotechnology technique makes table-top production of flat optics a reality

New record in nanoelectronics at ultralow temperatures

Nano-coating makes coaxial cables lighter

Acoustic tweezers moves cells in three dimensions, builds structures

Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News

The content herein, unless otherwise known to be public domain, are Copyright 1995-2016 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.