Acoustic signature

In addition, aircraft, machinery, and living animals can be described as having their own characteristic acoustic signatures or sound attributes, which can be used to study their condition, behavior, and physical location.

[1] The analysis of acoustic signatures is an important adjunct to passive sonar used to track naval warships and weapons.

Modern naval mines and torpedoes such as the CAPTOR mine can be programmed to distinguish the acoustic signatures of different vessels, leaving friendly vessels unmolested and attacking high-value targets when faced with multiple possible targets, e.g. distinguishing an aircraft carrier from its escorts.

The acoustic signature can be reduced by For a time Britain's Royal Navy toyed with the idea of the trimaran hulled Future Surface Combatant.

This project got as far as the construction of the research ship RV Triton to test the principle of a large-scale trimaran design.