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Head Up Display Repeater

Technical Information

Catalogue No: C1764
Category: Head-Up Display [HUD]
Object Type: Display Unit
Object Name: Head Up Display Repeater
Part No: 79-116-07-03A
Serial No: K06560013
Manufacturer: GEC Avionics
Division: Airborne Display [ADD]
Year of Manufacture: circa 1995
Dimensions: Width (mm): 0
Height (mm): 0
Depth (mm): 0
Weight (g): 0
Location: Simulator Laboratory

Contract Number. NEFMA-CI-40000-88-NR
JB000117 Iss2
The various sub-assemblies, The LHS has a module identification. There is a notice about the Desiccator and another about the tightening of the alignment bolt. This side also has an ID label for the Optical Unit Assy


The back-seater in the two-seat version of the Typhoon has the same control layout as the pilot, but with a "HUD repeater" instead of a HUD. This allows the rear seat pilot to see the HUD symbology and to have a very limited view forward around the front seat.
The HUD Repeater does not have a HUD Video Camera, and its Front Housing (not fitted here) is shaped to be compatible with the space behind the front seat and has its external connectors mounted on the sides.

The Typhoon HUD has a single element combiner using new computer generated holographic techniques to take out the distortion. The Combiner assembly features a single element comprising two glass plates bonded to produce a flat parallel sided assembly. A complex reflective holographic optical element (HOE) is recorded on photosensitised gelatine on the spherical interface sandwiched in the assembly which acts as the collimating Combiner. The construction optics to manufacture the HOE incorporate a CGH that generates a phase shape that could not be done using conventional lenses.

The combiner is also flat which minimises real world distortion and provides a total field of view (TFoV) of 30deg x 25deg with an instantaneous field of view (IFOV) of 30deg x 20deg.

This design is capable of cursive, raster and hybrid operation with a sunlight readable raster display. The minimal support structure gives a remarkably clear out-of-cockpit view optimal for air-to-air combat. The two seat variant has a similar HUD in the rear seat which can display video from the forward HUD camera. This design represents probably the `ultimate HUD' in service to date in a combat aircraft. The key feature is integrity such that the pilot no longer needs to monitor the HUD against other instruments thus reducing workload compared to Tornado for example.

In 1990 the Company was awarded a £54million contract in which the Airborne Display Division lead a consortium with Teldix GmbH of Germany, Selenia of Italy, and CESELSA of Spain,  to develop the EFA Pilot’s Head Up Display.

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