Electronic system automatically focuses camera or spotlight on moving object. Subject is equipped with miniature ultrasonic or radio transmitter; its signal is picked up by two or more detectors, is phase detected and fed into computer which determines position of subject and sends command signals to servo for camera or spotlight.
Tracking system for moving subjects
NASA Tech Briefs ; 1 , 1
1976-03-01
Miscellaneous
No indication
English
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