A multi-frequency method for ultrasonic ranging
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control Vol. 63, Nº 1, pp. 86 - 93, December, 2015.
ISSN (print): 0885-3010
Journal Impact Factor: 1,512 (in 2014)
Digital Object Identifier: 10.1016/j.ultras.2015.06.018
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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.