Multibeam Sonar Theory of Operation
Multibeam Sonar Theory of Operation
Multibeam Sonar Theory of Operation
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<strong>Multibeam</strong> <strong>Sonar</strong> <strong>Theory</strong> <strong>of</strong> <strong>Operation</strong> Detection Processing and Range Calculations<br />
In Figure Chapter 4 - -4, a time t 1 has passed since the sonar system has transmitted a ping. As<br />
yet, the ping has not reached the bottom, so there are no bottom echoes produced at time t 1 . The<br />
time slice at time 2 × t 1 , which is when any echoes produced at time t 1 would be received<br />
(remember, any echoes must travel back to the hydrophone array, and to do so requires the same<br />
amount <strong>of</strong> time it took the ping to propagate outward) will contain no echoes from the sea floor.<br />
However, it will have measurable amplitudes, as pictured in Figure Chapter 4 - -5. These<br />
amplitudes are due to background noise (discussed in “The Principles <strong>of</strong> <strong>Sonar</strong>” in Chapter 2).<br />
Figure Chapter 4 - -4: Hydrophone Array at Time t1<br />
Figure Chapter 4 - -5: Time Slice at Time 2 · t 1<br />
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