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By Night as by Day. Operate in the Light of Experience

Technical Information

Catalogue No: D0009
Document Type: Brochure
Topic: Head-Up Display [HUD]
Title: By Night as by Day. Operate in the Light of Experience
Company: Marconi Avionics
Division: Airborne Display [ADD]
Platform(s): A-10 Thunderbolt  A-7 Corsair  F-16C/D Fighting Falcon 
Date: 1984
Pages: 8
Copies: 2
Location: Filing Cabinet 01
Download Version: ZZ_1360771059_DDBR00... (4.29 MB)
Download Text Content: Download as .txt

Introduces the company's video & cursive mode HUD capabilities


The earlier version of DDBR0010

GEC-Marconi Avionics began development of diffractive (holographic) optical elements in the late 70’s building on the work of the Marconi Research Centre at Great Baddow under Dr Firth. A clean room was opened at Rochester in 1987 to carry out research and to manufacture holographic elements. It has an optical bench going down to bedrock to minimise the vibrations from the nearby motorway!  

The Company developed a diffractive optical system using three combiner elements which gave a large Head Motion Box. In 1980 Marconi won the contract to supply the HUD for the USAF LANTIRN programme of which 932 were manufactured for the USAF.  The LANTIRN programme links a Forward Looking Infra Red system to the HUD to present a TV picture at night of the outside world. The slight loss of transmission through the three combiner elements was not a problem in night operation although not ideal for Air-to-Air.

A raster display alone cannot give adequate symbol resolution and ensure that the symbology is always visible over the brightest shade of raster.  A technique of drawing all the symbology cursively in the field blank period of the video was developed which meant drawing nearly ten times as fast. Suddenly flying by night at low level was possible.  The HUD gives a 30 degree field of view in azimuth; essential for looking into turns and a 20 degree vertical view. The HUD was known as the DHUD for Diffractive HUD or WARHUD for Wide Angle Raster HUD. 

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