Fig. 1. Algorithm flow chart

Fig. 2. Structural diagram

Fig. 3. Signal characteristics of two quiet positions and their corresponding positions in the spectrum (abscissa is position/m, ordinate is frequency/Hz)

Fig. 4. The data of 1000 frames at the disturbance location and the corresponding position of its spectrum (abscissa is position/m, ordinate is frequency/Hz)

Fig. 5. Gaussian blur. (a) Before blurring; (b) Average blurring with a width of 20; (c) Gaussian fuzzy. The standard deviation sigma of Gaussian fuzzy is equal to 3, and the width is 21 points

Fig. 6. Test site

Fig. 7. Raw data

Fig. 8. Variance treatment

Fig. 9. Disturbance prescription difference curve

Fig. 10. Peak seeking algorithm