CS Group – Sopra Steria selected by CNES

CS Group – Sopra Steria selected by CNES to structure the future European space surveillance offering

Paris, March 19, 2026 – CS Group, a subsidiary of the Sopra Steria Group, has been selected by CNES (Centre National d’Études Spatiales) to design and develop “STREAMS”, a strategic program aimed at strengthening French and European space surveillance capabilities.

A strategic program for space security and sustainability

Faced with the explosion of orbital traffic, the multiplication of constellations, and the increasing risks related to debris, space surveillance is becoming a major strategic issue for security and technological sovereignty. Commissioned by CNES, CS Group – Sopra Steria will design and develop STREAMS to sustainably strengthen French and European capabilities in space situational awareness and control.

The program is structured around three key pillars:

• Consolidating the national catalogue of space objects by federating hundreds of sensors (optical, radar, radiofrequency, and eventually satellite-based) serving civil, commercial, and defense uses;
• Operating the European CAESAR service, dedicated to the detection and management of collision risks in orbit;
• Modernizing CNES’s SSA IT infrastructures 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 structure a robust and interoperable European framework.

Recognized expertise serving European space ambitions

With more than forty years of experience in the space sector, CS Group designs, integrates, and operates critical systems, particularly dedicated to orbital surveillance and space risk management. This expertise is built on key programs:

• OSMOSE: national space surveillance catalogue for CNES, serving as a central backbone for SSA data management and operations, 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: next-generation information system dedicated to the protection of military space infrastructures, 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 at CS Group, stated:
“With STREAMS, we are not just deploying a technical program: 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 affirm their role as architects and integrators of critical systems in support of a more autonomous, more resilient European space sector 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 structuring a sovereign and competitive European space surveillance services offering.

About CS Group

For more than 40 years, CS GROUP has been providing turnkey systems and engineering services for the space market and its applications. The Group, which is among Europe’s leading players in space systems, covers all space domains (Earth observation, navigation, telecommunications, science, and exploration) throughout the entire lifecycle of its clients’ systems (upstream studies, system development and validation, operations, and data valorization intelligence). CS GROUP is a major and recognized trusted partner of space and defense agencies, prime contractors and satellite operators, and users of space data.

As a designer, integrator, and operator of critical systems, CS GROUP, a subsidiary of the Sopra Steria Group, operates in demanding markets including defense and security, space, aeronautics, energy, and cybersecurity. With 3,000 employees combining a high level of technical and domain expertise, CS GROUP is a trusted partner for its clients in integrating and deploying operational systems that ensure the execution and safety of their missions.

About Sopra Steria

Sopra Steria, a major Tech player in Europe, with 51,000 employees across nearly 30 countries, is recognized for its consulting, digital services, and solutions. It helps its clients drive their digital transformation and achieve tangible and sustainable benefits.

The Group provides a comprehensive response to the competitiveness challenges of large companies and organizations by combining deep industry knowledge and technologies with a collaborative approach. Sopra Steria places people at the heart of its actions and is committed to helping its clients make the most of digital technology to build a positive future.

In 2025, the Group generated revenue of €5.6 billion.

Source: CS Group