Broadband Fish Identification of Great Lake Fishes

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Broadband Fish Identification of Great Lake Fishes

• Patrick Simpson and Mike Tuohey
• Scientific Fishery Systems, Inc.
• Anchorage, AK
• Guy Fleischer and Ray Argyle
• Biological Resources Division - U.S. Geological
  Survey
• Great Lakes Science Center
• Ann Arbor, MI

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Overview

• Why Broadband Sonar?
• System Overview
• Data Collection
• Classification Results
• Future Work

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Broadband vs. Narrowband
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Benefits of Broadband Fish Identification

• Full-Column Assessment
• Continuous Assessment
• Remote Assessment
• Cost Savings

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Broadband Sonar Fish Identification System
Prototype
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Broadband Transducer

• Resonant Frequency 153,600 Hz
• 3 dB Operation Band 45 kHz (138 - 183 kHz) Q3.4
• Active Surface 177-mm disc
• Beam Pattern 4.1 beamwidth, sidelobes _at_ 20 dB
• Rated Power 80 W transducer wet electronics
• Source Level 216 dB re 1 uPa _at_ 1 m _at_ 153.6 kHz
• Transmit Sensitivity peak TVR of 181 dB re 1
  uPa-m/V _at_ 169 kHz
• Receive Sensitivity peak OCVR of -180 dB re 1
  V/uPa _at_ 169 kHz

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Processing Platform

• Mid-tower computer case with 230 W power supply
• Plato motherboard with ISA/PCI bus adapters, 256
  kByte cache
• Intel Pentium 90 MHz CPU with 16 Mbyte DRAM
• PCI SCSI-2 host adapter controlling three SCSI-2
  devices below
• 1.0 GB hard disk, 1.3 GB magneto-optical drive,
  and quad-speed SCSI-2 CD-ROM
• 12 bit 770 kS/s ADC/DSP card with 486DX2/66 and 4
  MB on-board DRAM
• 1280 x 1024 video monitor and video adapter card
  with 2 MB DRAM
• DOS 6.22 running ORCA.EXE Interface Processing

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Data Processing
A/D CONVERSION
ECHO DETECTION
ACOUSTIC RECEIVER
FEATURE EXTRACTION
MAN-MACHINE INTERFACE
CLASSIFICATION
SIGNATURE DATABASE
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Features

• Single Ping Parameters
• Multiple Ping Parameters
• Environmental Parameters

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Neural Net Classifier
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Tethered Individual Fish
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Free-Swimming Fish
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Tethered Data Collection
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Classification Results
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Tethered Vs. Free-Swimming Results
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Future Work

• Wider Beam (15 degrees)
• Dual / Split Beam
• Greater Source Level
• Streamline Data Storage and Analysis
• More Data Collection