Before acquisition by Raytheon , the Hughes Aircraft Co. developed the AN/TPQ-37 Firefinder radar at its Fullerton, California facility, and manufactures it at its Forest, Mississippi plant.
Hughes AN/TPQ-36 Firefinder Weapon Locating System is a mobile radar system developed by Hughes Aircraft Company and manufactured by Northrop Grumman and ThalesRaytheonSystems . The system is a "weapon-locating radar", designed to detect and track incoming artillery and rocket fire to determine the point of origin for counterbattery fire . It is currently in service at battalion and higher levels in the United States Army , United States Marine Corps and Australian Army . Also Turkish Army , Portugal and Ukrainian Army  are among the users.