Abstract
Head-up displays (HUDs) have become an integral part of
the fighter aircraft and are now becoming increasingly popular in various
nonmilitary sectors also. It enhances the pilot's performance by providing
him with all of the flight, aircraft, target, and weapon data in collimated
fashion superimposed on his forward view. The collimation of HUD symbology
and infrared raster image removes requirement of refocusing eyes on outside
events. However, there are attention capture and cognitive tunneling issues
related with usage of HUD in aircraft. In this paper, effect of obstruction
due to beam combiner frame in form of misaccommodation, misconvergence, and
limited horizontal field of view (FOV) on attention capture of aircraft pilot
has been presented. While the beam combiner frame is necessary to hold wavelength
selective glasses, they provide obscuration in forward view of pilot in both,
total field of view (TFOV) as well as instantaneous field of view (IFOV).
Angle of combiner frame structure and its width present different degrees
of obscuration to the pilot within the head motion box (HMB). These limitations
cause inappropriate distribution of pilot's attention on outside events and
aircraft events, as he has to adjust his head position to view the obscured
part of outside world. This forces him to focus his attention more on outside
events which may make him miss some event on HUD symbology. The study and
experimental results have been presented in detail to corroborate this fact.
© 2014 IEEE
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