Exploiting signal processing approaches for broadband echosounders

Andone C Lavery,Christopher Bassett,J Michael Jech,Gareth L Lawson,David Demer

doi:10.1093/icesjms/fsx155

Abstract

© International Council for the Exploration of the Sea, 2017. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in ICES Journal of Marine Science 74 (2017): 2262–2275, doi:10.1093/icesjms/fsx155.

Highlights

Narrowband echosounders, transmitting single-frequency sinusoidal pulses, referred to as continuous wave (CW) tones, have been extensively used for fisheries research and studies of zooplankton ecology for over two and a half decades (Holliday et al, 1989; Foote et al, 1991; Andersen, 2001; Korneliussen and Ona, 2002; Wiebe et al, 2002; Fielding et al, 2012; Scoulding et al, 2015)
Calibration curves based on multiple on-axis calibration spheres
This study demonstrated that the calibration of the EK80 wideband, split-beam scientific echosounder across the full range of available Simrad transducers, including the 18 and 38 kHz transducers, is possible using three WC calibration spheres

Summary

Introduction

Narrowband echosounders, transmitting single-frequency sinusoidal pulses, referred to as continuous wave (CW) tones, have been extensively used for fisheries research and studies of zooplankton ecology for over two and a half decades (Holliday et al, 1989; Foote et al, 1991; Andersen, 2001; Korneliussen and Ona, 2002; Wiebe et al, 2002; Fielding et al, 2012; Scoulding et al, 2015). There has been a recent emergence of broadband acoustic backscattering systems transmitting frequency modulated (FM) signals, typically linearly-frequencymodulated signals, or chirps, for characterizing fish and other marine organisms (Foote et al, 2005a,b; Stanton et al, 2010, 2012; Lavery et al, 2010). The success of these broadband systems is built upon a long history of laboratory-based and in situ broadband measurements (Holliday, 1972; Simmonds and Armstrong, 1990; Stanton et al, 1998; Thompson and Love, 1996; Zakharia et al, 1996; Stanton, 2009; and references there in).

Methods

Results

Discussion

Conclusion