Missile Defence System

A missile defence system is a military setup designed to detect, track, intercept, and destroy incoming missiles before they reach their intended targets. Its main purpose is to protect civilian populations, military installations, and critical infrastructure. These systems rely on a coordinated network of satellites, radars, command centres, and interceptor missiles, which work together in real time to neutralise threats. Modern missile defence systems are layered, meaning they provide multiple opportunities to intercept a missile at different phases of its flight, such as the boost, midcourse, or terminal phases.

How an Interceptor Works

An interceptor is a defensive missile launched to destroy incoming threats. The interception process involves several steps:

1. Detection: Satellites detect the missile launch, and radars track its speed, direction, altitude, and projected impact point.

2. Decision: Data from tracking systems is analysed at a command centre to decide whether an interceptor should be launched.

3. Launch and Guidance: The interceptor missile is fired and guided mid-flight using radar updates to align with the incoming missile.

4. Destruction: The interceptor destroys the target either through a high-speed collision (hit-to-kill) or by detonating near it using a proximity fuse.

5. Assessment: Radar systems confirm whether the target is destroyed, and additional interceptors may be deployed if necessary.

India’s Missile Defence Architecture

India has developed a multi-layered missile defence system under the Defence Research and Development Organisation (DRDO) to counter various missile threats.

A. Ballistic Missile Defence (BMD) System

• Prithvi Air Defence (PAD): Designed for exo-atmospheric interception, it can destroy incoming missiles at altitudes ranging from 50 km to 180 km.

• Advanced Air Defence (AAD): Designed for endo-atmospheric interception, it neutralises threats within the Earth’s atmosphere at altitudes up to 30 km.

B. Layered Air Defence Shield

India’s layered air defence includes:

• Long-Range Defence: The S-400 Triumf, a Russian system, enhances India’s long-range air defence capability.

• Medium-Range Defence (70–100 km): The Barak-8 missile system, co-developed with Israel, provides 360-degree protection for both land and naval assets.

• Short-Range Defence (25–50 km): The indigenous Akash system and Israel’s SPYDER system protect strategic points and mobile army units.

C. Mission Sudarshan Chakra

Announced as a vision for 2035, Mission Sudarshan Chakra aims to develop a comprehensive, AI-enabled national missile shield, integrating multiple layers of defence for strategic resilience.

Key Missile Defence Systems Worldwide

Other countries have also developed advanced missile defence systems:

• Russia: S-400 Triumph, S-300VM, S-350 Vityaz, S-500 Prometheus.

• United States: THAAD, Patriot PAC-3 MSE, Golden Dome (in development).

• Israel: Iron Dome, David’s Sling, Iron Beam.

• China: HQ-9, HQ-22, HQ-16.

• European Sky Shield Initiative (ESSI): Skyranger, IRIS-T SLM.

These systems show that layered missile defence is a global standard for protecting strategic assets.

Challenges of Missile Defence Systems

Despite their advantages, missile defence systems face several challenges:

• High Cost: Each interceptor missile can cost millions of dollars, creating a cost imbalance against cheaper offensive missiles.

• Saturation Attacks: Large waves of missiles or drones can overwhelm the defence system.

• Hypersonic Threats: Fast and highly manoeuvrable hypersonic missiles are difficult to intercept, reducing the probability of success.

Way Ahead for India

Missile defence systems have become a critical component of national security. Although no system can provide complete protection, a layered interception capability significantly enhances resilience. For India, the future strategy involves:

• Developing indigenous missile defence systems to reduce reliance on foreign technology.

• Integrating advanced sensors and AI-enabled targeting systems for faster detection and interception.

• Strengthening domestic manufacturing capacity to ensure long-term strategic security.

• Maintaining a multi-layered defence to provide multiple interception opportunities against a variety of threats.