Transducer motion correction

KH K. Haris
RK Rudy J. Kloser
TR Tim E. Ryan
RD Ryan A. Downie
GK Gordon Keith
AN Amy W. Nau
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Echo-integration results will be biased if the change in orientation of transducer beam between the times of each ping is not accounted for. The effect of transducer motion on echo-integration was studied by Stanton67 and later Dunford68 developed a single correction function that can be applied for a wide range of circular transducers and related sv data. To fully characterize platform movement, the Dunford68 algorithm implemented in Echoview® requires motion data (i.e. pitch and roll of a platform) recorded at a rate above the Nyquist rate of platform’s angular motion69 to avoid temporal aliasing due to an inadequate sampling rate. When platform motion data were available at a suitable sampling rate (see ‘Technical Validation’ section), transducer motion effects were corrected using Dunford68 algorithm by ensuring time synchronization with recorded acoustic data (Fig. 5).

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