Abhay, Humsa UG, NACS, and AIDSS is new members of The Indian Navy’s SONAR systems

The Indian Navy recently inducted four SONAR (SOund Navigation And Ranging) systems to boosts its underwater surveillance capabilities on November 18th 2016.

These four indigenous sonar systems were developed by the Naval Physical and Oceanographic Laboratory (NPOL), a Kochi based laboratory of DRDO and handed over to the Indian Navy.

The systems included-

Abhay – compact hull mounted sonar for shallow water crafts,

An advanced active-cum-passive integrated sonar system designed and developed for the smaller platforms such as shallow water crafts and coastal surveillance/patrol vessels.

It is capable of detecting, localizing, classifying and tracking sub-surface and surface targets in both its active and passive modes of operation.

Humsa UG – upgrade for the Humsa sonar system

It is designed for upgrading the existing Humsa sonar system of the Indian Naval platforms.

NACS – Near-field Acoustic Characterisation System

NACS determines the in-situ performance of the SONAR systems which are used to find the frequency-dependent 3-D transmission and reception characteristics of the SONAR.

It is also used to measure the magnitude and phase characteristics of the SONAR transmission and reception electronics and the transducers.

The NACS has been integrated with the HUMSA-NG SONAR array and proved onboard Naval platforms and this will be fitted on all frontline ships.

AIDSS – Advanced Indigenous Distress sonar system for submarines.

It is a distress SONAR that is an Emergency Sound Signaling Device which is used to indicate that a submarine is in distress and enable quick rescue and salvage. It is a life-saving alarm system designed to transmit SONAR signals of a pre-designated frequency and pulse shape in an emergency situation from a submarine for long period, so as to attract the attention of Passive SONARS of Ships or Submarines in the vicinity and all types of standard rescue vessels in operation.

With the induction of these four systems, the underwater surveillance capability of the Indian Navy will get a boost, besides providing a fillip to the quest for self-reliance in this critical area of technology.


  1. PTI, New Delhi (Nov 18, 2016). Navy inducts four indigenously developed sonars systems. Retrieved from http://www.hindustantimes.com/
  2. Press Information Bureau (17-November-2016). Induction of DRDO developed Naval Systems into Indian Navy – A Curtain Raiser. Retrieved from http://pib.nic.in

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