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How do sonobuoys help aircraft search for submarines?
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Sonobuoys are essential tools for maritime surveillance, serving as floating buoys equipped with sonar sensors and radio transmitters. Because the range of sonar is limited, aircraft use these devices to cover vast ocean areas where surface ships or submarines cannot maintain constant surveillance.213
When deployed by aircraft, sonobuoys function through two primary acoustic methods:
- Passive Systems: These sensors listen for noise generated by a submarine, such as propeller sounds, and transmit the data via radio to the patrolling aircraft.423
- Active Systems: These buoys contain an acoustic projector that emits sound waves into the water; the buoy then receives and transmits the resulting echoes reflected off a target back to the aircraft.42
By receiving these radio signals, patrolling aircraft can effectively track the location, bearing, and movement of submerged vessels. This capability allows for the monitoring of areas that would otherwise remain undetected by traditional ship-based or hull-mounted sonar systems.42