Akash () is an Indian medium-range mobile surface-to-air missile (SAM) system developed by the Defence Research and Development Organisation (DRDO). The Army and the Air Force variants of the missile system are produced by Bharat Dynamics Limited (BDL) and Bharat Electronics Limited (BEL). Surveillance and fire control radar, Tactical Command and Control Center and missile launcher are developed by BEL, Tata Advanced Systems Limited and Larsen & Toubro. The Akash missile system can target aircraft up to away.Akash missile successfully test fired for second day, Dated:18 November 2014 It has the capability to neutralise aerial targets like fighter jets, cruise missiles and air-to-surface missiles. Nuclear-capable Akash missile test fired It is in operational service with the Indian Army and the Indian Air Force. In Armenian service, the system has been designated as Lusan (lit. 'Lynx').
An Akash battery comprises a single PESA 3D Rajendra radar and four launchers with three missiles each, all of which are interlinked. Each battery can track up to 64 targets and attack up to 12 of them. The missile has a high-explosive, pre-fragmented warhead with a proximity fuse. The Akash system is fully mobile and capable of protecting a moving convoy of vehicles. The launch platform has been integrated with both wheeled and tracked vehicles. While the Akash system has primarily been designed as an air defence SAM, it also has been tested in a missile defense role. The system provides air defence missile coverage for an area of . The Indian military's combined orders of the Akash, including radar systems (WLR and Surveillance), have a total worth of .Akash Missile Users Give Feedback To DRDO AVIATION WEEK As per Ministry of Defence (MoD) Report 2018, existing order of Akash saved of foreign exchange for India on imports.
Description System Each Akash battery consists of four self-propelled Launchers (three Akash SAMs each), a Battery Level Radar – the Rajendra, and a Command post (Battery Control Centre). Two batteries are deployed as a Squadron (Air Force), while up to four form an Akash Group/Regiment (Army configuration). In both configurations, an extra Group Control Centre (GCC) is added, which acts as the Command and Control HQ of the Squadron or Group. Based on a single mobile platform, GCC establishes links with Battery Control Centres and conducts air defense operations in coordination with air defense set up in a zone of operations. For early warning, the GCC relies on the Central Acquisition Radar. However, individual batteries can also be deployed with the cheaper, 2-D BSR (Battery Surveillance Radar) with a range of over 100 km.
Akash has an advanced automated functioning capability. The 3D CAR automatically starts tracking targets at a distance of around 150 km providing early warning to the system and operators. The target track information is transferred to GCC. GCC automatically classifies the target. BSR starts tracking targets around a range of 100 km. This data is transferred to GCC. The GCC performs multi-radar tracking of up to 200 targets and carries out track correlation & data fusion. Target position information is sent to the BLR which uses this information to acquire the targets.
The BCC which can engage a target(s) from the selected list at the earliest point of time is assigned the target in real time by the GCC. The availability of missiles and the health of the missiles are also taken into consideration during this process. Fresh targets are assigned as and when intercepts with assigned targets are completed. A single shot kill probability of 88% has been achieved by the system taking into consideration various parametres of the sensors, guidance command, missile capabilities and kill zone computations.
There are a number of possibilities for deploying Akash weapon system in autonomous mode and in group mode for neutralizing the threat profiles with defined multi-target engagement scenarios. In the Group mode we can have number of configurations to defend vulnerable areas depending upon nature and expected threat pattern, characteristics of threat. Similarly, multiple batteries in autonomous mode can be deployed to defend vulnerable areas/points. In a Group formation, the four Batteries can be deployed in various geometric formations, as suited to the vulnerable area being protected and the extent desired to be sanitized from enemy air threat. In a box deployment pattern, an Akash group can defend an area of 62 km × 62 km. In a linear array configuration, it covers an area of 98 km × 44 km. Trapezoidal configuration gives defense to the largest area as compared to any other pattern of deployment covering an area of size 5,000 km2.
Each Akash battery can engage up to four targets simultaneously with 24 ready to fire missiles. Each battery has four launchers with three missiles, while each Rajendra able to guide eight missiles in total, with a maximum of two missiles per target. Up to a maximum of four targets can be engaged simultaneously by a typical battery with a single Rajendra if one (or two) missile is allotted per target. A single Akash missile has an 88% probability of kill. Two missiles can be fired, five seconds apart, to raise the probability of Kill to 98.5%. Communications between the various vehicles are a combination of wireless and wired links. The entire system is designed to be set up quickly and to be highly mobile for high survivability. The Akash system can be deployed by rail, road or air.
The Akash SAM has been interfaced with both the Akashteer and the Integrated Air Command and Control System.
Missile
Akash is a surface-to-air missile with an intercept range of 25 km. It has a launch weight of 720 kg, a diameter of 35 cm and a length of 5.78 meters. Akash flies at supersonic speed, reaching around Mach 2.5. It can reach an altitude of 20 km and can be fired from both tracked and wheeled platforms. An on-board guidance system coupled with an actuator system makes the missile maneuverable up to 15g loads and a tail chase capability for end game engagement. A digital proximity fuse is coupled with a 55 kg pre-fragmented warhead, while the safety arming and detonation mechanism enables a controlled detonation sequence. A self-destruct device is also integrated. It is propelled by an Integrated Ramjet Rocket Engine. The use of a ramjet propulsion system enables sustained speeds without deceleration throughout its flight. The missile has command guidance in its entire flight.
The design of the missile is somewhat similar to that of the 2K12 Kub with four long tube ramjet inlet ducts mounted mid-body between wings. For pitch/yaw control four clipped triangular moving wings are mounted on the mid-body. For roll control four inline clipped delta fins with ailerons are mounted before the tail. However, the internal schematic shows a different layout with an onboard digital computer, absence of semi-active seeker, different propellant, different actuators and command guidance with datalinks. The Akash carries an onboard radio-proximity fuse.
Composite technology for Akash includes radome assemblies, booster liners, ablative liners, sustainer liners, compression molded wings and fins. The aerodynamic characterization research was conducted at the National Aerospace Laboratories' 1.2 m Trisonic Wind Tunnel Facility.
Propulsion The Akash, like the Russian 2K12 Kub (SA-6 Gainful), utilizes an integrated ramjet-rocket propulsion system, which, after initial rocket motor burnout, provides sustained thrust for the missile throughout its flight until interception.
Radars
The missile is guided by a phased array fire control radar called 'Rajendra' which is termed as Battery Level Radar (BLR) with a tracking range of about 60 km. The tracking and missile guidance radar configuration consists of a slewable phased array antenna of more than 4,000 elements, spectrally pure TWT transmitter, two stage superheterodyne correlation receiver for three channels, high speed digital signal processor, real time management computer and a powerful radar data processor. It can track 64 targets in range, azimuth and height and guide eight missiles simultaneously in ripple fire mode towards four targets. The radar has advanced ECCM features. The Rajendra derivative on a BMP-2 chassis and to be used by the Indian Air Force is known as the Battery Level Radar-II whereas that for the Army, is based on a T-72 chassis and is known as the Battery Level Radar-III.
The Army version also consists of the Battery Surveillance Radar (BSR). BSR is a track vehicle based, long range sensor, interfaced with the BCC. It can detect and track up to 40 targets in range and azimuth up to a range of 100 km.
Long range target acquisition is performed by the 3D Central Acquisition Radar (3D CAR), which is a long range surveillance radar that can track up to 200 targets in Track while Scan mode (detecting, tracking and processing) in three dimensions at a range of 180 km. It provides azimuth, range and height coordinates of targets to the Group Control Centre (GCC) through secure communication links. The data is used to cue the weapon control radar.About Akash
Platforms
The Army's radar and launchers are based on the T-72 chassis built by the Ordnance Factories Board's Ordnance Factory Medak to accompany the Army's fast moving armoured formations. The Air Force versions use a combination of tracked and wheeled vehicle. The Air Force Akash launcher consists of a detachable trailer which is towed by a Tata truck, which can be positioned autonomously. The Air Force launcher is designed by Larsen & Toubro jointly with DRDO. Both the Army and Air Force launchers have three ready-to-fire Akash missiles each. The launchers can slew in both elevation and azimuth. The Army Self-Propelled Launcher (ASPL) is 360 degrees slewable and its arc in elevation is from 6 to 60 degrees. The Akash Air Force Launcher (AAFL) is 360 degree slewable, in elevation it can fire from 8 to 55 degrees in all directions depending on the mode of deployment.Akash Launchers
Akash Air force launcher features an All electro servo drive system for fully automated and remote operation.To enable the Akash group to perform self-sufficient in the combat zone, a number of supporting specialist vehicles have been designed and developed. They are mobile and field-worthy. Their design is based on the role and task to be performed and the vehicles are accordingly allocated to the Group HQ, the Batteries, Assembly Line Area and the Field maintenance workshop. Some of the vehicles are: the Missile Transportation Vehicle (MTV), the Transportation and Loading Vehicle (TLV), the Mobile Station for Missile Checkout (MSMC) Vehicle, the Air Compressor Vehicle (ACV), the Power Supply vehicles (GPSV, BPSV), the Engineering Support, Maintenance and Repair vehicles (GEM, BEM) and a few others. These specialist vehicles assemble and prepare missiles, deliver them to Batteries, carry maintenance spares and fuel, and provide logistical engineering support. Their allocation provides for flexibility and self-sufficiency to the whole Akash Group.Akash Support Vehicles
The Indian Navy did not opt to aid in the development of a navalised variant of the Akash missile as its launcher systems where not stabilised for firing in open seas and therefore were considered unsuitable for shipborne usage. The Navy opted for the Israeli Barak-1 and the co-developed the Barak-8 missile for the Tri-service forces.
Development and history
The development of the missile began in 1984 as a part of the Integrated Guided Missile Development Programme (IGMDP) with an estimated development cost of under the directorship of Prahlada Ramarao.