Page 379 - The ROV Manual - A User Guide for Remotely Operated Vehicles 2nd edition
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14.2 Sound propagation 371
DI
No: Noise spectrum (dB/1μP, 1m, 1Hz) DI: Directivity (dB)
R: Slant range (meter)
a: Attenuation (dB/1000 m)
SL: Source Level (dB/1 μP)
Signal-to-noise ratio:
- Transmitted power (SL)
- Transmission loss (TL)
- Environmental noise (No)
- Transducer directivity (DI)
- Receiver bandwidth (B)
- Ray bending and reflected signals
SL
DI
Parameters:
No
FIGURE 14.1
Parameters of the sonar equation.
14.2.2 Intensity
The sound intensity is defined as the energy passing through a unit area per second. The intensity is related to pressure by:
I5p2=ρc
Reflected signal
Direct signal
