The European Space Agency (ESA) is Europe’s gateway to space. Its mission is to shape the development of Europe’s space capability and ensure that investment in space continues to deliver benefits to the citizens of Europe and the world.
Find out more about space activities in our 23 Member States, and understand how ESA works together with their national agencies, institutions and organisations.
Exploring our Solar System and unlocking the secrets of the Universe
Go to topicProtecting life and infrastructure on Earth and in orbit
Go to topicUsing space to benefit citizens and meet future challenges on Earth
Go to topicMaking space accessible and developing the technologies for the future
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The French ‘Doppler Orbitography and Radiopositioning Integrated by Satellite’ , DORIS, system relies on approximately 60 stations worldwide, transmitting radio signals whose Doppler shift when picked up by satellites can be measured to identify corresponding movements in the satellites, or in the stations themselves. Some of these stations are co-located with other reference techniques, namely Satellite Laser Ranging and Very Long Baseline Interferometry.