page_title: Defence Research and Development Organisation
section_title: Sonars
hierarchical_section_title: Defence Research and Development Organisation / Projects / Naval research and development / Sonars
caption_attribution_description: English: INS Shivalik frigate at Mazagon Dock Limited prior to commissioning.
context_page_description: The Defence Research and Development Organisation is an agency under the Department of Defence Research and Development in Ministry of Defence of the Government of India, charged with the military's research and development, headquartered in Delhi, India. It was formed in 1958 by the merger of the Technical Development Establishment and the Directorate of Technical Development and Production of the Indian Ordnance Factories with the Defence Science Organisation.
  With a network of 52 laboratories, which are engaged in developing defence technologies covering various fields, like aeronautics, armaments, electronics, land combat engineering, life sciences, materials, missiles, and naval systems, DRDO is India's largest and most diverse research organisation. The organisation includes around 5,000 scientists belonging to the Defence Research & Development Service and about 25,000 other scientific, technical and supporting personnel.
context_section_description: DRDO, BEL and the Indian Navy have developed and productionised a range of sonars and related systems for the Indian Navy's frontline combat ships.
   These include:
  APSOH (Advanced Panoramic SOnar Hull mounted),
  HUMVAD (Hull Mounted Variable Depth sonar),
  HUMSA (Follow on to the APSOH series; the acronym HUMSA stands for Hull Mounted Sonar Array),
  Nagin (Towed Array Sonar),
  Panchendriya (Submarine sonar and fire control system).
  Other sonars such as the airborne sonar Mihir are in trials, whilst work is proceeding apace on a new generation of sonars. DRDO's sonars are already present on the Indian Navy's most powerful ships. The standard fit for a front line naval ship would include the HUMSA-NG hull mounted sonar and the Nagin towed array sonar. The Mihir is a dunking sonar meant for use by the Naval ALH, working in conjunction with its Tadpole sonobuoy. The Panchendriya is in production for the Kilo class submarine upgrades.
caption: The Shivalik class of frigates contain significant DRDO-developed systems
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