Acoustic Strength-based Motion Tracking
summary
System creates a rotating sound field by driving two speakers with slightly different sine frequencies so a single microphone senses periodic sound-strength changes; angle comes from the strength-change frequency, distance from phase and Doppler, and results fuse for full motion tracks. A working prototype with two speakers and a phone achieves about 5 cm accuracy within 3 m, degrades with attenuation at larger ranges, supports 1 cm speaker separation, and reports a TA ratio >100 versus distance-based arrays.
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