Ground Station Engineering
ESTRACK (ESA Tracking Network) is a worldwide system of ground antennas providing links between spacecraft and ESA’s European Space Operations Centre (ESOC) in Darmstadt.
The ESTRACK core comprises six ground station sites in six regions of the world: Western Australia, Spain, Argentina, French Guiana, Sweden and Santa Maria in the Azores. The core part of ESTRACK includes ESA’s four 35 m antennas used primarily for deep-space missions across the solar system, two 15 m antennas used for near-Earth satellites and Earth Observation missions and a 5.5 m antenna located on an island in the Atlantic Ocean used for launcher tracking.
ESTRACK is ESA’s global backbone for mission-critical space communication, linking spacecraft across the solar system with ESOC to enable safe launches, precision navigation and high‑rate science data return. Powered by state‑of‑the‑art radio frequency (RF) and optical technologies, its capabilities are essential not only for ESA missions but also for international partners, underpinning cooperative operations and standards‑based cross‑support worldwide.
Our team designs, builds and upgrades RF and optical ground stations, providing critical tracking and communications with satellite missions for Science, Robotic and Human Exploration, Earth Observation, Space Safety, Space Transportation and Navigation. We deliver ground station systems tailored to excellent system performance with state-of-the-art technology suited for establishing reliable communications with satellites during any mission phase, from Launch and Early Orbit (LEOP) up to the science/exploration phase, including commissioning, critical manoeuvres, planetary insertions and other challenging scenarios.
ESA makes ESTRACK available for cooperative missions with international partners, including NASA, JAXA, CNSA, ISRO and KASA, as well as European national space agencies such as AEE, ASI, CNES, DLR and UKSA.
What we do
We are a team of project managers, system engineers and technology experts covering a multidisciplinary set of technical disciplines related to:
- antennas and mechanical systems
- servo control
- radio frequency active and passive subsystems like cryo-feeds
- low noise amplifiers
- diplexers
- frequency selective surfaces
- optical telescopes
- laser transmitters
- optical sensors and receivers
- modems
- TT&C processors
- cooling systems
- monitoring and control systems
- planning systems
- frequency and timing systems
- as well as power plants, security and access systems and other ancillary functions associated with ground station sites.
Our teams possess strong project management skills to deliver solutions fulfilling all defined user requirements on time and within budget.
In addition to supporting the development of ESTRACK required to support future ESA mission models and developing the associated new technologies, we also offer consultancy engineering services to ESA projects and non-ESA entities (space agencies and commercial operators) for the development and validation of their critical ground assets.
Finally, we support ESA projects in defining overall communications and navigation system architectures, as well as by validating such architectures through end-to-end tests, RF compatibility tests and system validation tests.
How we do it
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Working with other ESA engineering teams, we design new space communication solutions that enable challenging new missions, e.g. in Science and lunar and Mars exploration. This means developing the required new technologies for use in next-generation ground station systems, as well as answering, and often anticipating, the needs of missions currently being defined. Based on our space communication design expertise, we also define specifications for complete antenna systems that can be implemented by industry. Additionally, we support regular performance retesting and upgrades to ESTRACK’s core ground stations, leading to a continuous improvement of station capabilities and cost efficiency.
Finally, we support ESA’s involvement in setting European and international technical standards. Among other benefits, these standards allow ESA ground stations to track missions flown by other agencies – such as NASA or European national agencies – and vice versa. This is critical for fostering future cooperative missions at destinations such as the Moon or Mars.
DSA 4: New Norcia 3
The most recent major development for the ESTRACK network is the design and construction of ESA’s fourth deep-space ground station, DSA 4, located in New Norcia in Western Australia. Also known as New Norcia 3, the station provides a second 35 m deep-space antenna in the southern hemisphere, strengthening ESA’s global deep-space tracking capability.
DSA 4 complements the agency’s existing deep-space stations at New Norcia (DSA 1), Cebreros, Spain (DSA 2) and Malargüe, Argentina (DSA 3). By adding a second 35 m antenna at the Australian site, the ESTRACK network benefits from increased availability, improved redundancy and greater data-return capacity to support current and future scientific and exploration missions operating far from Earth.
The project started in 2021 and covered the design, manufacture and assembly of the 35 m diameter antenna. As with previous deep-space stations, the installation of the main reflector was a critical operation that required carefully controlled conditions. The station was formally inaugurated on 4 October 2025 in a ceremony attended by ESA Director General Josef Aschbacher and the Head of the Australian Space Agency, Enrico Palermo.
Following a period of testing and calibration, including the successful reception of its first signals from the Euclid spacecraft, DSA 4 is expected to enter routine operations in 2026. The station is equipped with cryogenically cooled receivers operating at approximately −263 °C (near absolute zero), a 20 kW radio-frequency transmitter and X-band and Ka-band capability to support high-data-rate deep-space communications.
Deep-space optical communications
While the ESTRACK network continues to expand its radio-frequency capacity, ESA is also developing next-generation optical space-to-ground solutions.
In 2025, the agency successfully completed its first deep-space laser communication campaign using the Psyche (DSOC) experiment.
This milestone was enabled by a Ground Laser Transmitter (GLT) deployed at the Kryoneri Observatory and a Ground Laser Receiver (GLR) at the Helmos Observatory in Greece, which was upgraded with a specialised optical receiver subsystem.
Together, they established a historic link with NASA's Psyche spacecraft from over 300 million km away, paving the way for a future "Solar System Internet."
Flyeye telescopes
In support of the Agency's Space Safety Programme, we are applying our expertise in automated tracking to develop a series of 'Flyeye' telescopes. This network of up to four telescopes is designed to scan the sky every night to automatically identify new Near-Earth Objects (NEOs) that could impact our planet. The unique optical design splits the image into 16 separate sub-channels – resembling the eye of a fly – to provide a massive field of view, allowing for a highly efficient and automated global survey system.
Spanish space surveillance and tracking
The Spanish Space Surveillance and Tracking (S3T) project, developed with ESA’s support, is an initiative of the Spanish Space Agency that implements space debris detection and surveillance. The system is centred around the S3TSR surveillance radar near Seville and the S3TOC operations centre in Madrid. Today, S3T is a vital asset integrated into the European SST framework, providing services like collision avoidance and re-entry prediction for hundreds of satellites.