GOCAT Unit Assembly

GEC-Marconi Avionics
GOCAT Unit Assy (ARINC404)
Part 229-056613-01
Ser 001
NSN
Code K0656
Mod Record 1, 2
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GEC-Marconi Avionics
Displays Division
GOCAT GPWS
Harrier Configuration
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[fan]
Airmax
A. K. Fans Ltd.
London N.W.10
Type AS-Y4237
Supply. 115V Y3 Ph-400Hz
Serial No.94-3274

A typical Ground Proximity Warning System uses radio altimeter information from 50 to 2,450 feet, with the barometric descent rate derived from an air data sensor. However, most current GPWS systems only operate effectively and reliably over terrain that is relatively flat or that has a constant gradient. Over more hilly areas, there is a tendency for many systems 'to produce nuisance warnings or, conversely, not to generate a warning early enough for effective action to be taken. GEC Avionics has developed a Ground and Obstacle ColliSion Avoidance Technique (GOCAT), using a digital map of terrain contours and obstacles that are stored in an onboard database. Techniques already developed for military use allow very rapid access to the database, from which aircraft position, height of terrain, and obstacles along the flight path are determined and passed to the pilot and aircraft subsystems.