It follows a deal made in March between Eads and Al Rashid, its Saudi Arabian partner, to install a razor-wire fence, thermal imaging and radar equipment along the country's 900km border with Iraq.
"This deal covers the rest of the border. It involves much technology, radar, camera systems," a Saudi official said.
Eads said the planned security system will "ensure border coverage is visible and managed at the sector level, whilst simultaneously providing situational awareness at the regional and national level".
The border project was first envisaged in the 1990s in the wake of the first Gulf War to secure Saudi Arabia's border with Iraq with physical fencing and high-tech monitoring.
But with increased worries over infiltration into the country by anti-government and al-Qaeda operatives, and a rise in illegal immigration from around the region, the Saudi interior ministry expanded the scope of the programme to fence and electronically monitor all the country's borders.
Securing the 1,300km-long border with Yemen is also a priority after militants announced in January the creation of al-Qaeda in the Arabian Peninsula.