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One HMD enhancement to mission effectiveness is the providing of video imagery used for pilotage (most effective during night and foul weather missions). This pilotage imagery is generated from sensors. These sensors can either be head/helmet-mounted, as with ANVIS, or aircraft-mounted, as with the FLIR on the AH-64 Apache. With head-mounted sensors, the resulting imagery is inherently correlated with the direction of head line-of-sight. However, to obtain this spatial correlation for aircraft-mounted sensors, it is necessary to slave the sensor to head motion; the sensor must be “visually coupled” to the head. [It should be noted that true line-of-sight is defined by eye gaze direction as well as head direction.] To accomplish this task, a head/eye tracking system is incorporated into the HMD. This visual coupling also provides the capability to point (aim) fire control systems (weapons). Visual coupling takes advantage of the natural psycho-motor skills of the aviator.
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