Multifrequency hearable sound wave amplitude summation-based distance measurement method

The invention discloses a multifrequency hearable sound wave amplitude summation-based distance measurement method, mainly for solving the problems of high synchronization requirement and big accidental error of present single frequency hearable sound wave distance measurement. The distance measurement method comprises the following implementation steps: (1) arranging a hearable sound wave generator, and emitting multifrequency hearable sound waves; (2) collecting sound wave signals for multiple times at different distances, performing FFT transformation, acquiring a sum of multifrequency sound wave amplitudes at the different distances, and using matlab to obtain a sound wave channel module; (3) collecting a sound wave signal by a sound wave collection device, and performing FFT transformation to obtain a sum of multifrequency amplitudes; (4) obtaining a distance measurement value according to the sum of multifrequency amplitudes and the sound wave channel module; (5) repeating the steps (3) and (4) to obtain multiple distance measurement values, removing abnormal distance measurement values, and averaging the rest values to obtain a final distance measurement value. The method reduces the accidental error of distance measurement, improves the distance measurement stability, and can be used for short distance measurement between devices.