Backscatter Data Acquisition for Hydrosweep-DS Aboard R.V. Ewing.
Abstract
This work focuses on continuing to develop an effective interface to capture and log 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. Due to the limited dynamic range of the existing converters, this design was not suitable. A prototype which acquired raw analog data at the output of the existing preamplifier using Crystal Semiconductor (CS-5336) dual channel, 16-bit delta sigma converters with a high quality differential amplifier front end was built and tested briefly, but a full system was not built due to lack of resources.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 04, 1996
- Accession Number
- ADA311204
Entities
People
- Dale N. Chayes
Organizations
- Columbia University