Rl Rd

1 m from source on its acoustic axis

1 m from source and at target or receiver

1 m from acoustic center of target

At hydrophone location

At hydrophone terminals

At hydrophone terminals

At display

101og10 101og10 lOlogjo 101og10 101og10

10 log

10 log intensity of source reference intensity3

signal intensity at 1 m signal intensity at target or receiver echo intensity at 1 m from target incident intensity noise intensity

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