Satellite Navigation

Engineering the Future of GNSS


Ground segment systems

Deimos expertise in ground segment systems for navigation missions is reflected in its important role in the development of Galileo, Europe’s own global navigation satellite system. The company is responsible for three critical elements of the ground segment: the Message Generation Facility, the Mission Support Facility and the Raw Data Generator.

Within EGNOS (V3) Deimos is responsible for system level trade-offs from an algorithmic perspective, support to system specifications and performance budgets, activities within the data processing segment, early experimentation and activities within the New Integrity Dual Frequency System Test Bed (NISTB).

Deimos is also involved in Galileo second generation (G2G) studies, participating in the Inter-Satellite Links (ISL); Deimos Space UK leads the study for G2G Orbit Determination and Time Synchronisation, for improved robustness and reduction of dependence from the ground segment, better navigation performance and improving the cost-benefit of the system on the long term.


Deimos expertise includes signal processing, performance analysis, user receiver algorithms and hybridization with other sensors, among others, having received funding from ESA and GSA. The company developed the Galileo Test User Segment for ESA, including the Off-line Analysis Tool, signal processing design and trade-offs for the Septentrio Test User Receiver.

Deimos has also developed the GRANADA Galileo GPS (G3) Receiver. This commercial off-the-shelf GNSS receiver supports the processing of GPS and Galileo signals. Its applications include GNSS Reflectometry applications, attitude determination, high accuracy navigation, hybridisation, R&D and education projects.


Deimos researches additional applications of GNSS signals such as GNSS Reflectometry and the use of GNSS in space.

GNSS Reflectometry (GNSS-R) involves the acquisition of both the direct and the reflected signals from GNSS satellites. The company has developed the SARGO system, which determines water characteristics through the analysis of reflected GPS and Galileo signals on the water surface. SARGO and the GNSS-R concept are used by Deimos for biomass estimation in the COREGAL European H2020 project.

The use of GNSS in space offers key advantages such as: increasing space vehicle autonomy, enabling high precision navigation and/or allowing the obtainment of unique science measurements. Deimos is actively involved in several GNSS space studies. These include the assessment of the suitability of GNSS in high orbits, with participation in the Proba-3 mission; evaluating the suitability of using GNSS as primary navigation for all phases of Moon missions; and defining improvements for the use of Galileo in space.

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