ABSTRACT
The Head-Up Display 8.1 Introduction This chapter introduces the idea of the head-up display (HUD) as a development of the gunsight. The requirements and optical principles employed by engineers to present information in this way are stated briefly. The limitations of early electro-optical projection hardware and the problems of installing units in the confined fast jet cockpit lead to a description of more modem techniques and the use of holographic optical elements. Alternative configurations are mentioned, such as the devices fitted to civil aircraft.
