India Expands Indigenous Sonar Fleet with Sixteen HUMSA-NG Mk II Installations

Overview of the HUMSA‑NG Mk II Sonar System

The fourth‑generation hull‑mounted sonar operates in both active and passive modes at the same time, delivering a detection range of up to forty kilometres in active mode and extending passive listening capability to ten kilohertz. Its design enables simultaneous tracking of eight underwater contacts, while retaining passive echo data for as long as sixty minutes. The system incorporates advanced signal processing techniques, including adaptive algorithms, and provides operators with dual high‑resolution display consoles that fuse sonar information with chart overlays for enhanced situational awareness.

Technical Specifications

The HUMSA‑NG Mk II sonar meets the following technical parameters:

| Parameter | Specification |

|---|---|

| Generation | Fourth |

| Operating Modes | Active and passive simultaneously |

| Active detection range | Up to 40 km |

| Passive frequency range | Up to 10 kHz |

| Simultaneous target tracking | Up to 8 contacts |

| Passive history retention | Up to 60 minutes |

| Display consoles | Two high‑resolution multi‑function units |

| Signal processing | Conventional and adaptive methods |

| Additional capabilities | Automated torpedo detection, bi‑static mode, sonar performance modelling |

The programme began in 2018 when NPOL finalized the design of the fourth‑generation hull‑mounted sonar, integrating lessons learned from earlier USHUS and PAYAL systems. Bharat Electronics scaled up production in its Bangalore facility, achieving a manufacturing capacity of ten units per year. The system’s dual‑mode operation and advanced signal processing were validated through sea trials aboard the INS Sagardhwani, an oceanographic research vessel, and later confirmed during live exercises in the Bay of Bengal.

Fleet Integration Details

The order allocates seven units to the newly commissioned Project 17A Nilgiri‑class frigates, three to the Tushil batch of Talwar‑class frigates built in Russia, four to additional Talwar‑class vessels, and one each to the legacy INS Rana destroyer and INS Brahmaputra frigate. This distribution ensures that the advanced sonar becomes the standard anti‑submarine sensor across the surface fleet, simplifying crew training, maintenance routines, and spare‑parts logistics while delivering a marked improvement in underwater target detection.

Strategic Implications

Standardizing the sonar across diverse platforms enhances interoperability and reduces the logistical footprint of the navy. By fielding a domestically produced system with a 40‑kilometre active range and 10 kHz passive capability, India strengthens its anti‑submarine warfare posture against modern quiet submarines. The capability to retain passive data for an hour supports longer‑duration patrols and more accurate target classification, thereby increasing mission effectiveness. Moreover, the indigenous nature of the system reinforces national defence self‑reliance and showcases the growing competence of Indian defence industry.

Future Outlook and Indigenous Growth

The programme began in 2018 when NPOL finalized the design of the fourth‑generation hull‑mounted sonar, integrating lessons learned from earlier USHUS and PAYAL systems. Bharat Electronics scaled up production in its Bangalore facility, achieving a manufacturing capacity of ten units per year. The system’s dual‑mode operation and advanced signal processing were validated through sea trials aboard the INS Sagardhwani, an oceanographic research vessel, and later confirmed during live exercises in the Bay of Bengal.

Deploying the HUMSA‑NG Mk II across sixteen platforms will markedly improve the navy’s ability to detect quiet diesel‑electric submarines at long range, a capability essential for safeguarding India’s expanding maritime trade routes. The standardized sonar suite simplifies crew training, reduces maintenance downtime, and streamlines spare‑parts logistics, thereby enhancing operational readiness. Moreover, the indigenous nature of the system reinforces the nation’s strategic autonomy and provides a technological foundation for future upgrades such as integrated acoustic sensor networks and AI‑driven target classification.

Conclusion

With the HUMSA‑NG Mk II now slated for sixteen vessels, the Indian Navy is poised to field a modern, home‑grown sonar capability that strengthens its anti‑submarine deterrent and reduces dependence on foreign technology. This systematic rollout not only upgrades existing ships but also sets a benchmark for future indigenous defence projects across the services.