吉林大学学报(工学版) ›› 2017, Vol. 47 ›› Issue (4): 1301-1307.doi: 10.13229/j.cnki.jdxbgxb201704041

• Orginal Article • Previous Articles     Next Articles

Precise ultrasonic ranging method based on self-adaptive wavelet de-noising

ZHUGE Jing-chang1, WU Jun2, ZHAN Xiang-lin1, YU Zhi-jing1   

  1. 1.College of Electronic Information and Automation, Civil Aviation University of China, Tianjin 300300, China;
    2.School of Aeronautical Engineering, Civil Aviation University of China, Tianjin 300300, China
  • Received:2016-03-10 Online:2017-07-20 Published:2017-07-20

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Abstract: The ranging accuracy of an ultrasonic ranging system depends on how to extract the time of flight of ultrasonic pulse exactly. Therefore, the de-noising method for ultrasonic receiving signals plays an important role in high precise ultrasonic ranging system. Traditional de-noising methods can not automatically adjust their de-noising threshold and wavelet layers due to the fixed model, which limits their use in different environment. In order to improve the efficiency of the de-noising method for ultrasonic receiving signals, a self-adaptive wavelet de-noising method is proposed. This method can automatically choose the optimal wavelet parameters through real-timely extracting the characteristics of the noise in received signals. Then, the time of flight measurement accuracy can significantly increased by improving the signal-to-noise ratio of the ultrasonic received signals. Verification experiments show that the measurement error is less than 0.28 mm in indoor environment, which meets most of distance measurement requirement for industrial manufacturing.

Key words: information processing, ultrasonic ranging, self-adaptive filter, threshold adjustment

CLC Number: 

  • TH915.05
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