TERPROM

TERPROM (Terrain Profile Matching) is a military navigation Ground Proximity Warning System (GPWS) employed on aircraft and missiles, which uses stored digital elevation data combined with navigation system and radar altimeter inputs to compute the location of an aircraft or missile above the surface of the earth. It is also used as a warning system to prevent aircraft from flying too close to the ground.

TERPROM was initially conceived in 1977 within the Bristol based Guided Weapons New Projects Office of British Aerospace as part of a MoD funded contract to advise the Government on the development options and applications of tactical cruise missiles.

TERPROM (R) utilises Terrain Reference Navigation to provide aircraft with a Predictive Ground Collision Avoidance System (PGCAS) as well as Obstruction Warning and Cueing (OWC)

TERPROM is produced by Atlantic Inertial Systems, Plymouth UK, formerly a subsidiary of BAE Systems, acquired in December 2009 by Goodrich Corporation.

TERPROM has been used on on the following aircraft:
 * F-16, Mirage 2000, Harrier, SEPECAT Jaguar, Panavia Tornado, A-10, Eurofighter Typhoon, BAE Hawk C-130 and C-17 aircraft
 * Storm Shadow cruise missile
 * SOM cruise missile