| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1758651 | Ultrasonics | 2015 | 8 Pages |
•Ultrasonic ranging based on the cross-correlation of two multi-frequency signals.•Stimulus signal composed by sine-wave bursts, containing different frequencies.•The frequency of each sine-wave burst is different from that of the adjacent bursts.•Time-of-flight is estimated by finding the maximum of cross-correlation.•Error corresponding to two standard deviations, for up to 1 m, is less than 0.3 mm.
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.
