The Indian MoD recently inked contracts worth ₹5,083 crore ($550M) for the ALH Mk-III (MR) and VL-Shtil missiles.
According to the MoD press release on the Vertical Launch Shtil missiles: “The contract for the procurement of Surface-to-Air Vertical Launch Shtil missiles and associated missile holding frames, valued at ₹2,182 crore ($236M), has been signed with JSC Rosoboronexport, Russian Federation. The acquisition is intended to substantially enhance the air defence capabilities of frontline warships against a wide spectrum of aerial threats.
The system will reinforce the layered air defence architecture onboard Indian Navy platforms by providing rapid-reaction, all-weather engagement capability and improved survivability in contested maritime environments.”
Shtil-1
The Shtil-1 is an area air defence missile system developed by Russia’s Almaz-Antey for light warships.
The Shtil-1 uses the 9M317ME semi-active radar homing (SARH) missile, a specialised naval variant of the missile used in the land-based Buk-M2 air defence system. The 9M317ME is a single-stage solid-fuel interceptor with folding fins to fit inside compact VLS canisters. During mid-course, the missile uses inertial guidance,
The choice of a SARH system represents a well-considered engineering trade-off that prioritises cost, missile size, and terminal power over the “fire-and-forget” convenience of an Active Radar Homing (ARH) system like the MR-SAM.
The use of SARH enables strong target illumination using the ship’s high-power fire-control radars (such as the MR-90 Orekh). In contrast, an ARH missile relies on a small, battery-powered radio frequency (RF) transmitter, resulting in weaker target illumination.
SARH seekers are significantly cheaper and simpler to mass-produce than ARH seekers. Since a ship might need to carry 24–36 missiles, the cost savings are substantial.
By removing the radar transmitter and its associated cooling and power requirements from the missile, engineers can either reduce missile size or use the additional space for a larger warhead or more fuel.
An ARH missile is more susceptible to jamming due to its low-power RF transmitter. Since a SARH seeker is passive (it only listens), it is harder for a target to jam the missile directly. The target would have to overpower the ship’s high-power radar, illuminating it.
However, SARH systems have limitations. They work best for shorter-range engagements. The ship must maintain a line of sight to the target to keep it illuminated. This makes it difficult to engage sea-skimming missiles that are over the radar horizon.
Additionally, the further the target is from the ship, the weaker the reflected illumination becomes, in accordance with the inverse square law.
Shtil-1 Antecedents
The Shtil-1 system replaces the older Shtil/Uragan systems that used a single-arm rail launcher. In contrast, the Shtil-1 employs a modular, below-deck cellular Vertical Launch System (VLS).
This allows 360-degree omnidirectional defence without the need to rotate a heavy launcher toward the target.
Shtil-1 Performance
The system is capable of a high rate of fire, launching a missile every 2–3 seconds.
The Shtil-1 is designed to intercept a wide spectrum of aerial threats, including supersonic aircraft, helicopters, drones, and high-speed anti-ship missiles. It can engage targets at ranges from 3.5 km to 50 km and at altitudes ranging from as low as 5 metres (sea-skimming missiles) up to 15 km.
A single installation can reportedly track and engage up to 12 targets simultaneously, making it effective against swarm or saturation attacks.
The Shtil-1 was developed for Project 11356R (Admiral Grigorovich-class) frigates in the Russian Navy. It currently equips Indian Navy Tushil-class frigates (Project 11356 derivatives).
Several Indian Navy warships previously equipped with Shtil/Uragan systems are now being fitted with Shtil-1 systems. These include:
Batch I & II Talwar-class frigates — INS Talwar, INS Trishul, INS Tabar, INS Teg, INS Tarkash, and INS Trikand — originally equipped with the 3S-90 single-arm launcher located forward of the bridge, carrying 24 missiles.
Delhi-class destroyers — INS Delhi, INS Mysore, and INS Mumbai — which feature two 3S-90 single-arm Shtil/Uragan launchers (one forward and one aft) firing 9M38M1 missiles. These are now slated for, or currently undergoing, Shtil-1 upgrades as part of their mid-life refits; they are also being equipped with improved Fregat-M2EM radars to handle contemporary saturation threats.
Shivalik-class stealth frigates — INS Shivalik, INS Satpura, and INS Sahyadri — originally fitted with the single-arm Shtil/Uragan launcher and now slated for, or undergoing, Shtil-1 upgrades like the Delhi class destroyer.
Conclusion
The Shtil-1 is one of the two principal area air defence systems fitted on Indian Navy warships, the other being the Israeli-Indian MR-SAM (Barak-8).
The Shtil-1 is both robust and cost-effective. As an evolution of the Buk family, it has an creditable operational track record.
It relies on Semi-Active Radar Homing (SARH), wherein the ship continuously illuminates the target with dedicated radars until impact. The high power of the ship’s radar mitigates the effects of RF stealth techniques. The system’s relative simplicity and the availability of multiple vertical launch cells enable a high rate of fire.
In contrast, the MR-SAM is a more sophisticated, more expensive fire-and-forget system that uses Active Radar Homing (ARH). It offers a superior range of approximately 70 km and higher manoeuvrability due to its dual-pulse motor.
The Shtil-1 (using the 9M317ME missile), by comparison, employs a more traditional single-stage, single-pulse solid-fuel motor.
The MR-SAM is better suited to high-value capital warships, while the Shtil-1 provides a more cost-effective solution for smaller platforms such as frigates.
- Vijainder K Thakur is a retired IAF Jaguar pilot, author, software architect, entrepreneur, and military analyst.
- Follow the author @vkthakur
