Backscatter Data Acquisition for Hydrosweep-DS Aboard R.V. Ewing

摘要

This work focuses on continuing to develop an effective interface to capture andlog the raw hydrophone and supporting data. The objectives are to design and implement a data acquisition scheme that preserves calibrated base banded quadrature samples of the output of individual hydrophone staves and the required supporting data for use with modern signal processing and swath mapping techniques. The initial approach consisted of tapping the pre-existing digital output of each hydrophone channel, performing a base banding operation and retaining enough samples to provide about twice the Nyquist rate for later processing.