ONERA and AID sign an experimental agreement in partnership with TDF

05/09/2025

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ONERA and AID sign an experimental agreement in partnership with TDF, as announced by the French Minister of Defence at the Paris Air Show.

 

The French Minister of the Armed Forces, Sébastien Lecornu, accompanied by Emmanuel Chiva, Delegate General for Armaments, and Patrick Aufort, Director of the Defense Innovation Agency, visited the ONERA NOSTRADAMUS transhorizon radar site in Crucey on Thursday, September 4, 2025, welcomed by Bruno Sainjon, Chairman and CEO of ONERA, and in the presence of Karim El Naggar, CEO of TDF.

On this occasion, Patrick Aufort and Bruno Sainjon signed an agreement for the launch of a €2M ONERA experiment as part of the ministerial strategy for Very High Altitude announced at the 2025 Paris Air Show by the Minister of the Armed Forces, a zone extending from 20 km to 100 km altitude, the new strategic theater between sky and space.

The NOSTRADAMUS project has been identified and selected as a "Quick Win", with a view to demonstrating to the French Ministry of Defence the detection capabilities of a trans-horizon radar on representative objects (aircraft, missiles, balloons), particularly at very high altitudes. This demonstration will be based on the new digital capabilities recently implemented by ONERA. Both monostatic and bistatic configurations of Nostradamus will be used.

As a partner in the project, infrastructure operator TDF will make available the exceptional infrastructure of its Ondes Courtes broadcasting site in Issoudun, in the Indre region of France, the only one of its kind in Europe. This several-hectare site features very large, steerable antennas that use the natural bouncing properties of the ionosphere to transmit over very long distances. Combined with the technologies developed by ONERA and the cutting-edge expertise of TDF's wave scattering teams, they will enable the Nostradamus radar to operate in bi-static mode, an advanced surveillance system based on a logic of separation between transmission and reception.

 

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About Nostradamus radar

Designed in the 2000s with the support of the DGA, ONERA has designed, maintained and modernized this radar, the only one of its kind in Europe. Operating in the HF band, its waves are reflected by the ionosphere (skywave propagation), enabling it to detect beyond the horizon, where conventional radars stop.

Trans-horizon radars are an essential building block in the detection chain for very long-range systems, even at very high altitudes. NOSTRADAMUS has the capacity to continuously monitor an air volume of several million km3.

NOSTRADAMUS uses two configuration modes: monostatic and bistatic. In monostatic mode, the transmitting and receiving antennas are located in the same place (Crucey-Villages in the Eure-et-Loir region of France), providing 360-degree coverage. In bistatic mode, the transmitting and receiving sites are separated by 200 km.

Thanks to its two configuration modes, the radar is capable of continuously monitoring an air volume of several million km3, spotting both fast, distant objects (hypervelocity cruise missile, hypersonic glider...) and slow, close targets (surveillance balloon...).

 

Bruno Sainjon, Chairman and CEO of ONERA, commented:

"Thanks to NOSTRADAMUS, France now has a strategic Very High Altitude capability at the cutting edge of world know-how. The Ministry's interest in this radar, the only one of its kind in Europe, confirms the importance of aerospace research, underlining both the very high scientific quality of our researchers and our visionary role in anticipating technological breakthroughs and the future needs of our armed forces. ONERA, a public research establishment, has demonstrated its ability to deliver operational capabilities to the armed forces, such as the GRAVES system and, in 2024, the GIRAFE quantum sensor and the SAP anti-drone system.

Karim El Naggar, Chief Executive Officer of TDF, said:

" This partnership with ONERA fully illustrates TDF's ability to mobilize its exceptional industrial assets and unique technical know-how in the service of strategic projects for national sovereignty. Thanks to our Ondes Courtes broadcasting site in Issoudun, the only one of its kind in Europe, and our historic expertise in wave propagation, TDF is contributing to the development of surveillance capabilities in the Very High Altitude zone. We're proud to be part of an initiative that strengthens our country's technological sovereignty and security."

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