In a separate contract announcement, it said it would supply stand-alone global positioning system receivers for the French navy's Lynx helicopters, which are undergoing upgrades.
The value of each contract wasn't disclosed.
Under the agreement with the unidentified European country, which will be performed in phases over a 10-year period, Thales will replace legacy radio location systems with a single solution built around its network of TRC 6500 COMINT/DF network, which feature a fixed subsystem and mobile subsystem with several COMINT/DF receivers in each.
The TRC 6500 COMINT/DF provides geolocation data on radio emissions in the HF band as simultaneous signal interception, classification and monitoring.
"We are delighted to have been selected to develop this new HF radio location system, which will significantly improve the operational efficiency of our customer's electronic intelligence capability," said Patrice Caine, vice president for Thales's Radio Communication Products business.
"The awarding of this contract is a further endorsement of the quality of our range of radio spectrum interception and electronic warfare solutions."
Under the contract to the French military's Service Industriel de l'Aeronautique, Thales will provide its GNSS 1000-S receiver, which uses Selective Availability Anti-Spoofing Module technology to access military GPS encrypted signals, for the Lynx helicopters.
Thales said its GNSS 1000-S "uses state-of-the-art signal processing offering extended satellite tracking capabilities in terms of precision, integrity, availability and jamming resistance in severe operational conditions."