Paris, March 19, 2026 – CS Group, a subsidiary of Sopra Steria, has been selected by CNES (the French space agency) to design and develop “STREAMS”, a strategic programme aimed at strengthening French and European space surveillance capabilities.
A strategic programme for space safety and sustainability
With the surge in orbital traffic, the proliferation of constellations and the growing risks associated with debris, space surveillance is becoming a major strategic issue in terms of security and technological sovereignty. Commissioned by CNES, CS Group – Sopra Steria will design and develop STREAMS to sustainably enhance French and European capabilities in space situational awareness and control.
The programme is structured around three key pillars:
- Strengthening the national catalogue of space objects by federating hundreds of sensors (optical, radar, radiofrequency and, ultimately, satellite-based) serving civil, commercial and defence uses.
- Operating the European CAESAR service, dedicated to the detection and management of in-orbit collision risks.
- Modernising CNES’s SSA IT infrastructure to improve performance, resilience and data processing capabilities.
STREAMS will be deployed alongside a leading industrial ecosystem – Aldoria, Hemeria, Safran Data Systems and Auticon – to establish a robust and interoperable European framework.
A recognised expertise supporting European space ambitions
With over forty years of experience in space, CS Group designs, integrates and operates critical systems dedicated to orbital surveillance and space risk management. This expertise is underpinned by major programmes:
- OSMOSE, the national space surveillance catalogue for CNES, serving as the core system for SSA data management and exploitation, also contributing to European EU-SST services.
- ESSOR, part of the France 2030 initiative, aimed at demonstrating an integrated service combining optical and radar sensors, with the objective of building a dynamic catalogue that could reach nearly 100,000 objects by 2030.
- SIS-NEXT, a next-generation information system dedicated to protecting military space infrastructure, capable of aggregating and processing massive volumes of data from space- and ground-based sensors in real time for highly critical applications.
Sylvain D’Hoine, Executive Vice President Space, CS Group, said: “With STREAMS, we are not merely deploying a technical programme: we are structuring a strategic European capability. Space situational awareness is now a matter of sovereignty, security and competitiveness. By leading STREAMS alongside CNES and a leading industrial ecosystem, CS Group and Sopra Steria are reaffirming their role as architects and integrators of critical systems, serving a more autonomous, more resilient European space sector that is capable of exerting lasting influence on the international stage.”
Supported by a leading industrial ecosystem, STREAMS represents a key milestone for CS Group in the development of ASTREK, a future hub for a sovereign and competitive European space surveillance service offering.
About CS Group
For over 40 years, CS GROUP has been delivering turnkey systems and engineering services for the space sector and its applications. As one of Europe’s leading players in space systems, CS Group covers all space domains (Earth observation, navigation, telecommunications, science and exploration) across the entire system lifecycle of its clients (upstream studies, system development and validation, operations and data intelligence).
A designer, integrator and operator of critical systems, CS GROUP, a subsidiary of Sopra Steria, operates in demanding markets including defence and security, space, aeronautics, energy and cybersecurity. With 3,000 employees combining high levels of technical and domain expertise, CS GROUP is a trusted partner for integrating and deploying operational systems that ensure the conduct and safety of its clients’ missions.
For more information, visit cs-soprasteria.com
About Sopra Steria
Sopra Steria, a major Tech player in Europe with 51,000 employees in nearly 30 countries, is recognised for its consulting, digital services and solutions. It helps its clients drive their digital transformation and obtain tangible and sustainable benefits. The Group provides end-to-end solutions to make large companies and organisations more competitive by combining in-depth knowledge of a wide range of business sectors and innovative technologies with a collaborative approach. Sopra Steria places people at the heart of everything it does and is committed to putting digital to work for its clients in order to build a positive future for all. In 2025, the Group generated revenues of €5.6 billion.
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Sopra Steria (SOP) est coté sur Euronext Paris (Compartiment A) – Code ISIN : FR0000050809
For more information, visit us at www.soprasteria.com
Contacts presse
Aurélien Flaugnatti, aurelien.flaugnatti@soprasteria.com, +33 (0)6 30 84 75 81
Hopscotch Publics Relations, pr-soprasteria@hopscotch.fr, +33 (0)6 58 53 30 90
