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2014 INMARTECH Optimizing Sonar Performance by Managing Acoustics

Optimizing Sonar Performance by Managing Acoustics

Presentation given at the 2014 INMARTECH Meeting in Corvallis, Oregon in November, 2014.

Typical Sources of Acoustic Noise:

  • Machinery Noise
  • Sonar Interference
  • Electronic Noise
  • Propeller Cavitation (Hub and Tip Vortex)
  • Hydrodynamic Flow Noise
  • Appendage Cavitation
  • Transients
  • Bubble Sweepdown

Why Acoustic Noise is Important:

  • Excessive ship-related noise can degrade sonar performance
  • Degraded sonar performance will impact quality of acquired sonar data
  • Reduced sonar performance will increase time required on station to conduct survey operations

What is Quiet?

  • Typically 49 dB is used as a quiet ship threshold for 12 kHz systems
  • For shallower systems that operate at higher frequencies, the threshold is in the lower 40 dB range
  • However, with more information being pulled out of sonar data (water column), the better the signal-to-noise, the better the data quality