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EK80
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EK80
• What is EK80
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EK60 functionality
And Wideband (Broadband) functionality
New Wide Band Transceiver (WBT)
New operating software (EK80)
Existing and new transducers
Wideband
• What is wideband (broadband) in EK80?
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The transceiver (WBT) can operate from 10 kHz to 500 kHz
Simrad transducers determine bandwidth
Types of signals:
• Continuous wave (CW) – “One discrete” frequency during entire pulse duration (EK60)
• Chirp – Frequency increasing linearly from low to high during pulse duration
• User defined – User specifies transmit sample values (e.g. simulated dolphin click)
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Wideband benefits
• High range resolution and Long range
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(for resolved single targets)
• Continuous target frequency response
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Wideband resolution and range
• EK60
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High range resolution using short pulse duration
Long range performance using long pulse duration
Compromise between high range resolution and long range performance
• EK80 - Wideband
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Range resolution depends on bandwidth – not on pulse duration
High range resolution using wide bandwidth
Long range performance using long pulse duration
High range resolution and long range performance using wide bandwidth and long
pulse duration
Wideband frequency response
• EK60
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Volume backscatter, Sv(f), for discrete frequencies
Target strength, TS(f), for discrete frequencies
• EK80 - Wideband
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Volume backscatter, Sv(f), continuously over entire band
Target strength, TS(f), continuously over entire band
Increased information about acoustic properties of targets
Increased information about target species, size, and angle of orientation
Transducers
• Requirements
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High transducer transmit and receiving sensitivity over a wide bandwidth.
Transmit and receiving sensitivity is directly related to
• Directivity (Beam opening)
• Transducer efficiency
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Low internal electronic noise level for the echo sounder.
Careful system installation in order to eliminate/reduce interference from other
electronic noise sources over the entire operational bandwidth.
• Simrad composite transducers
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ES70-7C, ES120-7C, ES200-7C, ES333-7C
High efficiency
Low sidelobes
Repeatable beam patterns
Reliable
WESTZOO - Survey area
BERGEN
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OSTERFJORD
Scenery
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TS probe 2009
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38, 70, 120, 200, 333 kHz
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Motorized transducer platform
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Inside probe
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Example - Catches
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Example - Mychtophids
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Example - Inside the krill layer
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Example – More krill
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Example - Saithe schools
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Example – WC 22 mm in tank
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EK80
• Some comments to the new EK80 functionality
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EK80 software will work with a combination of EK80 WBT’s and EK60 GPT’s to
allow smooth transition.
• The EK60 GPT’s will of course not be able to provide wideband functionality.
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EK80 will be able to provide almost all the existing functionality of the EK60 and
much more.
EK80 is able to use split beam to determine single target position also when
operating with wideband and will correctly compensate for the beam pattern
according to target position and the wideband frequencies.
EK80 will be able to display Sv(f) and TS(f) in real time.
EK80 WBT has 4 channels and each channel can be configured independently.
This allows for support of new transducers with new configurations, e.g. split beam
using 3 sectors and one single beam.
www.simrad.com
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