An Investigation of the Sources and Characteristics of the Noise Component in SeaMarc II Echo Signals.
Abstract
As is well known, the SeaMarc II towfish system was lost at sea during a scientific survey cruise in the Southern Ocean near the beginning of this project. Work was immediately begun on the design and construction of a replacement mapping system to be called HAWAII MR1. The signal processing for this system was designed based on the crude and incomplete information obtained earlier from one short series of noise measurements that had been made on SeaMarc II with experimental modifications. In the new MR1 system, the recorded signal consisted of digital, complex samples of the acoustic echo (i.e. in-phase and quadrature components, referenced to transmitter sinusoidal waveform). The entire duration of the echo signal was recorded, including the entire water column reverberation and the subsequent seafloor echoes, usually out to 70 - 80 degrees incidence angle.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 28, 1996
- Accession Number
- ADA327355
Entities
People
- Stanley Zisk
Organizations
- University of Hawaiʻi System