15.3 Traditional sonar technology
Traditional sounders use a single carrier frequency or carrier wave
for the sonar ping. These sounders work by measuring the time it
takes the ping echo to return to the transducer to determine target
depth. Using this method if 2 targets are close together they can be
shown as a single large target, rather than multiple smaller targets
D12600-1
15.4 Broadband CHIRP sonar technology
Broadband sonars use a swept frequency 'CHIRP' signal which can
distinguish between multiple close targets, this enables the sonar to
display multiple targets instead of large combined targets.
Some of the benefits are improved:
• Target resolution.
• Bottom detection even through bait balls and thermoclines.
• Detection sensitivity.
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Using the fishfinder
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