Underwater acoustics 24 Underwater acoustic communication 9 article 7 Acoustic wave propagation 6 Acoustic noise 5 TK Electrical engineering. Electronics Nuclear engineering 5 Threedimensional (3-d) 5 Passive acoustic monitoring 4 Signal to noise ratio 4 Acoustics 3 Animals 3 Autonomous underwater vehicles 3 Hydrophones 3 QA75 Electronic computers. Computer science 3 Sonar 3 Surface waters 3 acoustics 3 noise 3 Acoustic communication signals 2 Acoustic fields 2 Acoustic transmission 2 Audition 2 Bathymetry 2 Comprehensive Nuclear-Test-Ban Treaty 2 Cost effectiveness 2 Ecoacoustics 2 Ecosystems 2 Fish 2 Modulation 2 Nonlinear internal wave 2