Small aperture acoustic velocity sensor
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United States of America Patent
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Dec 29, 2020
Grant Date -
Feb 2, 2017
app pub date -
Jul 27, 2016
filing date -
Jul 31, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A small aperture acoustic velocity sensor and a method for velocity measurement are disclosed. In one aspect, the disclosed technology uses spatially-shifted sub-arrays for projection and/or hydrophone receipt and cross-correlation of successive pulses to improve correlation and reduce bias. The spatial shift can be created physically by selection of groups of elements or virtually by weighting the contributions of fixed sub-arrays. Spatial modulation can be used to form a projected signal and measured spatial phase of slope across the set of sub-arrays allows correction of both long- and short-term errors. The disclosed technology uses spatial and/or temporal interpolation.
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