Why does my AWAC AST appear to miss the surface and have bad/missing detects?
The AST window is set dynamically based on the pressure sensor reading from the preceeding current profile. This means if the pressure sensor is damaged or with a large, incorrect offset the window may be set incorrectly. There is unfortunately no way to correct for this later or in post-processing as the listening window does not capture the surface reflection.
Make sure to set the pressure offset before each deployment or contact us about returning the instrument if the pressure sensor is faulty.
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