Sonobuoys

News: India and the U.S. announced cooperation on co-production of U.S. sonobuoys for Undersea Domain Awareness (UDA) for the Indian Navy.

About Sonobuoys

• Sonobuoys are expendable, electro-mechanical acoustic devices used to detect underwater sounds, such as those made by submarines or ships.
• Working Mechanism:
  • Sonobuoys are dropped from aircraft or ships in canisters and activate upon contact with water.
  • An inflatable float with a radio transmitter remains on the surface for communication, while hydrophones descend to a predetermined depth to capture underwater acoustic signals.
    • These signals are relayed via Very High Frequency (VHF) or Ultra High Frequency (UHF) communication to monitoring platforms.
  • Sonobuoys operate in two modes:
    • Passive Mode: These sonobuoys listen for underwater sounds without emitting any signals, providing stealthy detection.
    • Active Mode: These sonobuoys send out sound waves and measure the echoes to locate submarines or other objects.
• Features:
  • Versatility: Detects and tracks submarines in varied environments.
  • Precision: Deployed in patterns to locate submarines accurately.
  • Customizability: Adjustable depth and sensitivity.
  • Interoperability: Compatible with naval aircraft like P-8 Poseidon and MH-60R helicopters.
• Applications:
  • Primarily used for Anti-Submarine Warfare, sonobuoys are also deployed for environmental monitoring, marine life studies, and oceanographic research.
    • They assist in understanding underwater conditions like water temperature, salinity, and ambient noise levels.