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Official Journal of the Asia Oceania Geosciences Society (AOGS)

Figure 3 | Geoscience Letters

Figure 3

From: Passive acoustic measurement of flow velocity in the Straits of Florida

Figure 3

Laboratory experiment on clock stability. (a) Relative time shift between the system clocks of instruments 1 and 2 is shown as a function of time from the start of the experiment. The linear fit to the measurements corresponds to the assumption that the relative clock drift is constant over 4 weeks. (b) Same as (a) but for instruments 2 and 3. (c) Deviation of measured time shifts from the average linear month-long trend for the 1–2 clock pair. (d) Same as (c) but for instruments 2 and 3. Circles, triangles, and crosses show the measurements using noise cross-correlation, cross-correlation of synchronization pulses, and matching the leading fronts of the synchronization pulses, respectively.

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