Helmet tracking techniques using phase difference between acoustic beating envelope whose wave length is longer than audio frequency
Korea Aerospace Industries Ltd., South Korea
: J Electr Eng Electron Technol
Helmet mounted display (HMD) has great advantages on the navigation and mission symbologies for the pilotâs forward looking display and therefore has been remarkably drawing attention as the upcoming display of the next generation aircraft. The essential technology to process the line of sight-forward (LOS-F) data in real-time is to estimate exact helmet situation and position. In this paper, we research a acoustic helmet tracking technique. For the reason that mechanical acoustic noises might interfere with helmet tracking system (HTS) and unnecessary acoustic noises are inevitable when using acoustic technique, this approach has not been adapted. In order to overcome this problem, we propose that acoustic wave of which the wave length is longer than audio frequency and especially we used beating signal envelope which is composed of two close high frequencies.