The RDL will have 51 per cent stakes while the share of Thales in the JV will be 49 per cent.
The JV is being set up to develop India's capabilities to integrate and maintain radars and manufacture high performance airborne electronics.
Thales is a leading supplier of radars, electronic warfare solutions and software to Dassault Aviation which is supplying 36 Rafale jets to India at a cost of around Rs 60,000 crore.
The Thales-RDL JV is being set up to leverage Thales' offset commitment as part of the deal for the 36 fighters planes.
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"We are delighted to seal this strategic collaboration with Reliance Defence Limited. This JV resonates with our strategy to strengthen our industrial footprint in the country by building collaborations with the Indian industry," said Patrice Caine, the chairman and CEO of Thales, after finalising the deal in Paris.
"The strategic partnership with global leader Thales is another major milestone in our march towards best in the class manufacturing at support facilities for military hardware in India," he said.
Reliance, he added, was committed to the government's 'Make in India' and 'Skill India' initiatives and would continue to remain in the forefront, partnering with leading companies in the world.
The JV would develop skills and activity in the Special Economic Zone of Mihan-Nagpur along with an Indian supply chain for the manufacturing of microwave technologies and high performance airborne electronics, the two companies said in a joint statement.
India had in September last year signed a Euro 7.87 billion (approx Rs 59,000 crore) deal with France for the purchase of 36 Rafale fighter jets capable of carrying nuclear weapons and equipped with latest missiles.
The Rafale aircraft to be manufactured by French aviation company Dassault, will come with various India- specific modifications.