The order for two Hostile Artillery Location systems is worth $7.2 million. No other contract details were given.
HALO is an acoustic weapon locating system that detects sound waves generated by gun or mortar fire and other explosions and uses data processing techniques to accurately determine the location of the source of the sounds.
It uses unmanned sensor posts -- with clusters of sensitive microphones -- to detect the pressure waves, the company said.
The company, part of Finmeccanica, said six major armed forces, including the United Kingdom, United States and Canada, around the world use the system.
"This follow-on order reinforces HALO's position as the world's leading acoustic weapon location system," said Colin Horner, Selex's land systems vice president. "HALO's proven track-record of high performance and reliability makes it the clear choice for armed forces deployed on global operations."