ExailECA Group is joining forces with iXblue and becomes Exail Learn more

ECA GROUP's DORIS beacons help CNES localise satellites and measure climate change

Friday, March 12 2021
A reliable partner to the CNES for 40 years:  ECA GROUP has been developing three generations of ground beacons for the DORIS system since the 1980s.

The 40-year-partnership between CNES and ECA GROUP continues

ECA GROUP, expert in the development of satellite tracking systems, has furnished the French National Centre for Space Studies (CNES) with DORIS beacons since the 1980s. Since then, ECA GROUP has been developing three generations of ground beacons for the CNES’s DORIS system. In 2020, ECA GROUP delivered 20 beacons, and in the coming two years, the company will deliver 50 more for the renewal of the CNES’s satellite stations.

Who is DORIS?

DORIS is a name given to the French space system for precise orbit determination and positioning that includes ECA GROUP’s ground beacons. The system has been developed by the CNES and the French National Institute of Geographic and Forest Information (IGN). DORIS stands for Doppler Orbitography and Radiopositioning Integrated by Satellites. The beacons work like an ‘inverted GPS’ as they send a signal from the ground to the satellite to know its correct position in orbit. The DORIS beacons send out a signal every 10 seconds in two different frequencies, allowing measurements with ultimate precision, thanks to a bench built by ECA GROUP and an antenna from COBHAM. 

 

ECA GROUP-DORIS Beacon-Sainte Helene.JPG

DORIS beacon in Saint Helena (South Atlantic): Beacons consist of an antenna and three boxes.

What does DORIS do?

In the 1980s, the beacon’s measurements served only to localize the exact positon of a satellite. Today, the beacons contribute to analyzing climate change as they participate in measuring rising sea levels as well as the change in height of the Antarctic ice sheet.

Known to scientists, but still a surprise to the public: DORIS beacons have also proven the earth’s slight deformation. To the naked eye a perfect “blue marble”, our planet is in reality the shape of a football that lost air over time, slightly squashed at its poles and swollen at the equator.

 

How does DORIS work ?

DORIS is a microwave tracking system. It uses a network of 60 ground stations that send a radio-electric signal out to orbit – to the on-board receivers of satellites like SPOT, JASON, ENVISAT, CRYOSAT and SENTINEL 3 and 6.

The system works on the principle of the Doppler effect: The frequency of a wave changes when a transmitter and a receiver are in relative motion to each other. The frequency increases as the two objects get closer and decreases as they move apart. A simple example is the drop in pitch of an ambulance siren as it passes by.

The DORIS system uses this effect as it transmits and receives radiofrequency waves.

And these radiofrequency waves can help us analyse ocean levels and glacial melting or they can support us in cartography – science in the service of nature’s wonders, but also in the service of bigger concerns – climatic change.

Photorights: © CNES/ill./DUCROS David, 2013

More Aerospace news ?
exail-aviation-simulation-FFS awack
Air France Industries KLM Engineering... AEROSPACE

Exail, formerly ECA Group, and Air France Industries KLM Engineering & Maintenance (AFI KLM...

Read More
ECA-GROUP-EVENT-2020 -TRANSPORT-LOGISTIQUE-VIGNETTE
TRANSPORTS & LOGISTICS MEETINGS 2022... ENERGY INDUSTRY

Visit Exail at TRANSPORTS & LOGISTICS MEETINGS in Cannes, November 7 - 9 2022, to discover,...

Read More
ECA GROUP FTE_APEXASIA2022_logo
FUTURE TRAVEL EXPERIENCE APEX Asia... AEROSPACE

  Meet ECA Group at FTE APEX ASIA EXPO, Marina Bay Sands, Singapore to discover its new...

Read More
ECA GROUP_WIZY-WAP
ECA Group introduces its next... AEROSPACE

  ECA Group unveils WIZY-WAP, the first high performance WI-FI 6E Wireless Access Point...

Read More
APEX EXPO
2022 APEX EXPO, CA USA | 25-27... AEROSPACE

  MEET ECA Group AT APEX EXPO 2022, DISCOVER OUR NEW WIRELESS PRODUCT RANGE EXTENDED WITH...

Read More
aircraft interior
Aircraft Interiors EXPO 2022 | June... AEROSPACE

Meet ECA Group at AIRCRAFT INTERIORS EXPO 2022 in Hamburg to discover our On-Board Equipment...

Read More
aWAP - range
ECA Group's aWAP-MS is now on-boarded... AEROSPACE

Developed by ECA Group, the "all-in-one" device aWAP-MS is now on-board Hawker...

Read More
ECA GROUP SATELLITE 2022_logo
SATELLITE 2022 | 22-24 March 2022 |... AEROSPACE

Meet ECA Group at SATELLITE 2022 - Washington DC, USA and discover our antenna tracking system,...

Read More
vignette_amc_2018.jpg
AEEC | AMC 2022 | 9-12 May | ECA... AEROSPACE

Meet ECA Group at the AEEC | AMC (Airlines Electronic Engineering Committee (AEEC) & Aviation...

Read More
ECA GROUP_MRO EUROPE
MRO EUROPE 2022 | OCTOBER 19-20 | ECA... AEROSPACE

Meet ECA Group at MRO EUROPE 2022 October 19-20 to discover our solutions in Aerospace Testing,...

Read More
copyright 2023 eca group© all rights reserved - legal terms - privacy policy - sitemap - A Groupe Gorgé company