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Helmet-mounted sight systems track the helmet angular orientation, thereby allowing the user to readily point weapons and sensors or to cue viewing among crew members. Most helmet- mounted display applications require that the helmet orientation be measured so that the displayed information can be properly presented. Helmet-mounted sights, also referred to as head trackers or helmet trackers, have been mechanized using a variety of technologies, each having apparent advantages. The leading technology candidates include magnetic, electro- optic, and ultrasonic head tracking systems. The selection of a particular concept is usually dependent on the specific application and the associated operational requirements. A technology overview is presented describing various electro-optic, ultrasonic, and magnetic mechanizations that have been developed. The performance characteristics are summarized with an indication of the strengths and weaknesses inherent in each approach.
Frank J. Ferrin (Thu,) studied this question.