Why in news?

India recently advanced its naval strike capabilities as the DRDO and the Indian Navy successfully conducted a salvo test of the indigenously developed Naval Anti-Ship Missile Short Range (NASM-SR) from a helicopter off the Odisha coast. Two missiles were fired in quick succession from the same platform, marking the first successful salvo launch from a chopper.

The NASM-SR is designed for deployment from ship-borne helicopters and represents an upgrade over existing systems.

It incorporates advanced features such as “man-in-loop” guidance, allowing real-time control during flight, and “waterline hit” capability, which enhances its effectiveness in disabling enemy ships.

The test highlights the growing importance of helicopter-launched missiles in enhancing naval flexibility, precision strike capability, and maritime dominance.

What’s in Today’s Article?

• Role of Helicopter-Launched Missiles in Naval Warfare
• Need for NASM-SR: Modernising India’s Naval Missile Capability
• NASM-SR Missile: Design and Key Features
• Advanced Capabilities of NASM-SR: ‘Man-in-Loop’ and ‘Waterline Hit’
• NASM-SR Salvo Test: Demonstrating Enhanced Strike Capability

Role of Helicopter-Launched Missiles in Naval Warfare

• Helicopter-launched missile systems like the NASM-SR enhance naval combat capability by allowing forces to strike enemy ships from a safe distance without exposing their own vessels to direct threats.
• This is crucial for anti-surface warfare and maintaining sea control in contested maritime zones.
• The Indian Navy already uses systems like the British-origin Sea Eagle missile deployed on Sea King 42B helicopters, enabling ship-based helicopters to launch precision strikes.
• This flexibility makes such systems highly effective in modern naval operations.

Need for NASM-SR: Modernising India’s Naval Missile Capability

• The older Sea Eagle missiles, introduced in the 1980s, have become outdated and lack modern technological capabilities. A major drawback is their heavy weight (around 580 kg), limiting the number of missiles a helicopter can carry.
• To address these limitations, the DRDO initiated the development of a lighter, more advanced, and indigenous missile in the early 2010s, aimed at enhancing operational flexibility.
• The project involved multiple premier DRDO laboratories, including:
  • Research Centre Imarat (Hyderabad)
  • Defence Research and Development Laboratory
  • High Energy Materials Research Laboratory (Pune)
  • Terminal Ballistics Research Laboratory (Chandigarh)
• The NASM-SR is being produced with the participation of private sector partners, MSMEs, and start-ups, strengthening India’s indigenous defence manufacturing ecosystem.

NASM-SR Missile: Design and Key Features

• The NASM-SR missile is designed with a two-stage propulsion system, comprising a solid booster rocket for initial thrust and a long-burn sustainer engine for extended flight.
• It is equipped with advanced subsystems, including a seeker for target detection and tracking, a radio altimeter to measure altitude above sea level, and a high-bandwidth two-way data link that enables real-time communication between the missile and the operator in the helicopter.
• Weighing around 380 kg, it is significantly lighter than older systems, allowing helicopters to carry more missiles.
• Although its range (55 km) is lower than that of earlier missiles, it compensates with improved technology and operational flexibility.
• The missile uses a radio proximity fuse to detonate its warhead when it reaches close proximity to the target, ensuring effective impact.

Advanced Capabilities of NASM-SR: ‘Man-in-Loop’ and ‘Waterline Hit’

• Many modern navies have helicopter-launched missiles that have these two features: ‘man-in-loop’ and ‘waterline hit’.
• ‘Man-in-Loop’ Guidance
  • The NASM-SR incorporates a “man-in-loop” feature, allowing a human operator to modify the missile’s trajectory during flight.
  • Enabled by a two-way data link, this system provides real-time feedback and control, making the missile more precise and adaptable.
  • It is particularly useful in crowded maritime environments, reducing the risk of accidental targeting and improving effectiveness against moving or evasive threats.
  • Unlike older “fire-and-forget” missiles such as the Sea Eagle, which cannot be redirected after launch, the NASM-SR’s guided control ensures greater operational flexibility and accuracy, especially in dynamic combat scenarios.
• ‘Waterline Hit’ Capability
  • Another key feature is the “waterline hit” capability, where the missile targets the area just above or at the waterline of a ship.
  • This is a structurally vulnerable point, and a strike here can cause severe damage, rapid flooding, and potentially sink the vessel.
  • This precision targeting significantly enhances the missile’s lethality compared to earlier systems lacking this capability.

NASM-SR Salvo Test: Demonstrating Enhanced Strike Capability

• The recent test involved firing two NASM-SR missiles in quick succession from a single helicopter, showcasing the system’s ability to execute a salvo launch.
• The test has operational significance:
  • Demonstrates capability to overwhelm enemy ship defence systems
  • Enhances effectiveness in real combat scenarios
  • Increases chances of successful target neutralization
• The salvo test highlights a major leap in India’s naval strike capability, combining precision, survivability, and multi-target engagement to strengthen maritime warfare readiness.