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 open services provided by Galileo are realized by using the signals at L1, E5a and E5b whether data or pilot. Morover several combinations are also possible, such as a dual frequency service based on using L1 and E5a (for best ionospheric error cancellation) to single frequency services (at L1, E5a, E5b or E5a and E5b together) on which case the ionopheric error is removed using a model, and even triple frequency services using all the signal together (L1, E5a and E5b) which can be exploited for very precise centimetric type of applications.