Eyeball (EB) is a helmet-mounted cueing system used to display cueing symbology for target designation and location on a helmet-mounted display. In order to provide information and interact with the environment, the EB consists of two basic subsystems: a helmet-mounted inertial sensor unit that measures the accelerations and angular rates at which the head of the pilot is exposed and a helmet mounted display. When appropriately initialized and maintained, the inertial measurements can be used to determine the line-of-sight of the pilot wearing the helmet. Since the pointing direction is computed with respect to an external inertial reference frame, this line-of-sight can then be used for slaving any external system sharing the same inertial reference.
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