Government formally inducts SONARS for armed forces

Q.  DRDO has handed over 4 naval systems to the Indian Navy in 2016. These include:
- Published on 19 Dec 16

a. Abhay
b. Ajay
c. HUMSA-UG
d. Only a and c
e. All the above

ANSWER: Only a and c
 
Government formally inducts SONARS for armed forcesGovernment has formally inducted 4 types of indigenously developed SONARS that will boost underwater surveillance capacity of the armed forces.

Some of the major systems are Heavy Weight Torpedo (Varunastra), Advanced Torpedo Defence System (Mareech), Multi Influence Ground Mines, etc.
In November 2016, Kochi based Naval Physical Oceanographic Laboratory (NPOL) of DRDO, has handed over the following four naval systems to Indian Navy:
  • Abhay (Compact Hull-Mounted Sonar for Small Ships & Shallow Water Crafts)
  • HUMSA-UG (Upgrade for the Hull-Mounted Sonar Array (HUMSA) Series of Sonar Systems for Ships)
  • NACS (Near-field Acoustic Characterisation System (NACS) for Ship Sonars)
  • AIDSS (Advanced Indigenous Distress Sonar System (AIDSS) for Submarines)
What is SONAR?
  • Stands for Sound Navigation and Ranging.
  • Uses sound propagation to navigate, communicate and detect objects under surface of the water.
  • Two types: Passive & Active
  • A special type of sonar is SODAR, an upward looking in-air sonar
  • Acoustic frequencies: Vary from infrasonic to ultrasonic
  • Study of Underwater Sound: Hydroacoustics.

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