CSO-3 optical Earth-observation satellite successfully launched

06/03/2025

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The CSO system comprises three defense and security satellites

This trio has two distinct missions: reconnaissance for CSO-1 and CSO-3, and identification for CSO-2, affording higher resolution and refined analysis

The very-high-resolution optical instrument flying on each satellite is a marvel of technology built by prime contractor Thales Alenia Space

Cannes, March 6th, 2025 - The CSO-3 military observation satellite has been successfully launched by Arianespace atop an Ariane 6 from Europe's spaceport in French Guiana. Carrying a very-high-resolution optical instrument built by Thales Alenia Space, the joint venture between Thales (67%) and Leonardo (33%), the satellite was developed by prime contractor Airbus Defence & Space for the French defense procurement agency DGA on behalf of the French Air and Space Force's Space Command, with delegated oversight from the French space agency CNES.

CSO CNES

The third and last component in the CSO system for France's MUSIS* military program, CSO-3 will provide increased coverage and revisit capabilities to enable more effective conduct of military operations and faster crisis response.

Designed to the most stringent intelligence and defense requirements, CSO-3 is equipped with a cutting-edge instrument developed by Thales Alenia Space. This instrument is the core of the mission, affording exceptional resolution and detail of Earth's surface. Its unrivaled performance enables it to acquire imagery at extremely high resolution, even in low-light conditions and at night thanks to its infrared capabilities. Its advanced technologies include latest-generation optical systems and ultra-sensitive sensors.

CSO CNES

Like for the previous Helios 1, Helios 2 and Pleiades satellites, Thales Alenia Space designed strategic equipment for the CSO system, including the solar arrays, very-high-throughput image telemetry systems, and encryption/decryption modules to ensure data security and confidentiality. The company also supplied the systems telemetry, tracking and control transponders.

The launch of CSO-3 is a major milestone for French sovereignty in space, both in terms of launch capabilities and satellite technology, said Herv Derrey, Thales Alenia Space CEO. With the completion of this system, France is leading the way in optical space reconnaissance. The CSO system's exceptional performance is based in particular on the optical instrument built by the teams at Thales Alenia Space and our industry partners. These unique skills in Europe are strategically important and demonstrate our ability to meet the new challenges facing French and European sovereignty.

*Multinational Space-based Imaging System for Surveillance, Reconnaissance, and Observation

About THALES ALENIA SPACE Drawing on over 40 years of experience and a unique combination of skills, expertise and cultures, Thales Alenia Space delivers innovative solutions for telecommunications, navigation, Earth observation, environmental management, exploration, science and orbital infrastructures. Governments and private industry alike count on Thales Alenia Space to design and build satellite-based systems that provide anytime, anywhere connections and positioning, monitor our planet, enhance management of its resources and explore our Solar System and beyond. Thales Alenia Space sees space as a new horizon, helping to build a better, more sustainable life on Earth. A joint venture between Thales (67%) and Leonardo (33%), Thales Alenia Space also teams up with Telespazio to form the parent companies' Space Alliance, which offers a complete range of services. Thales Alenia Space posted consolidated revenues of approximately 2.2 billion in 2023 and has around 8,600 employees in 8 countries, with 16 sites in Europe.

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LINK:	https://www.thalesgroup.com/en/worldwide/space/press_release/cso-3-opt...
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CSO-3 optical Earth-observation satellite successfully launched

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