Military Fast Jet
For military fast-jets, the high speed and low altitude which may frequently be flown, make traditional GPWS systems unsuitable as the blind spot becomes the critical part. Thus an enhanced system is required, taking inputs not only from the radar altimeter but also from inertial navigation system (INS), Global Positioning System (GPS), and flight control system (FCS), and using these to accurately predict the flight path of the aircraft up to 4 to 5 miles (6.4 to 8.0 km) ahead. Digital maps of terrain and obstacle features are then used to determine whether a collision is likely if the aircraft does not pull up at a given pre-set g-level. If a collision is predicted a cockpit warning may be provided. This is the type of system deployed on such aircraft as the Eurofighter Typhoon. The U.S. FAA has also conducted a study about civilizing 3D military thrust vectoring to recover jetliners from catastrophes.
Read more about this topic: Ground Proximity Warning System
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