A multi-frequency method for ultrasonic ranging

作者：Queiros Ricardo^*; Alegria Francisco Correa; Girao Pedro Silva; Serra Antonio Cruz

来源：Ultrasonics, 2015, 63: 86-93.

DOI：10.1016/j.ultras.2015.06.018

• Ultrasonic distance measurement
• Time-of-flight
• Cross-correlation

This paper presents a method for ultrasonic ranging based on the cross-correlation of two multi-frequency signals. The stimulus signal is composed by multiple sine-wave bursts/segments, each containing a different frequency and an integer number of periods. The frequency of each sine-wave burst is different from that of the adjacent bursts, but it is very close to the transducer resonant frequency. The time-of-flight (TOF) is estimated by finding the maximum of the cross-correlation. Interpolation is used to increase the measurement resolution. The experimental error corresponding to two standard deviations, for a range up to 1 m, is less than 0.3 mm.

• 出版日期2015-12