期刊名称：International Journal of Electronics Communication and Computer Engineering
印刷版ISSN：2249-071X
电子版ISSN：2278-4209
出版年度：2012
卷号：3
期号：5
页码：1130-1136
出版社：IJECCE
摘要：The main role of head-up displays (HUDs) is to provide key flight, navigation, guidance, aircraft, weapon and target information to the pilot in his forward field of view on a see through screen known as beam combiner (BC). Hypothetically, it allows for optimal control of the aircraft events through the concurrent scanning of HUD symbology and the outside world scene. While the HUD has been shown to improve flight performance and efficiency of the pilot, there are perceptual and cognitive issues associated with its usage. It is found that in case of HUD usage the pilot’s attention in an aircraft is driven by display salience, his/her mission and his/her expertise. The physical properties of the display like color, salience, brightness, orientation, size, and clutter; pilot’s mission and expertise; and task requirements determine the level and division of attention and tunneling between the aircraft and the outside events. Based on the study results, it has been established that the HUD display brightness plays a key role in affecting pilot’s event detection capability. While the brightness of the HUD display can make the features embedded in the symbology significant, it can also force the pilot’s attention to be focused on the aircraft or the outside event depending on the level of the ambient brightness, HUD display brightness and the contrast ratio. The experimentation conducted under varying ambient brightness conditions resulted in varying responses from the participants depending on the ambient brightness, HUD display brightness and the display contrast ratio. The results showed the effect of these parameters on the capability of pilot to detect unintentional attention fixation to the display and to detect changes in aircraft events shown on HUD, or the outside environment. The behaviour of the participants was thus studied to simulate the likely behaviour of pilot under such conditions. The results were translated into a neuro-fuzzy based system such that the HUD display brightness could be dynamically altered to maintain adequate contrast ratio to minimize the tunneling effect due to the HUD brightness and resulting salience factors, thus also optimizing the attention between the aircraft (HUD symbology) and the outside event.
