Akash (meaning Sky) is a medium range surface-to-air missile developed as part of India's Integrated Guided Missile Development Program to achieve self-sufficiency in the area of surface-to-air missiles. It is the most expensive missile project ever undertaken by the Union government in the 20th century. Development costs skyrocketed to almost $120 million which is far more than other similar systems.
Akash is a medium-range surface-to-air missile with an intercept range of 30 km. It has a launch weight of 720 kg, a diameter of 35 cm and a length of 5.8 metres. Akash flies at supersonic speed, reaching around Mach 2.5. It can reach an altitude of 18 km. 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 a solid fuelled booster stage. The missile has a terminal guidance system capable of working through electronic countermeasures. The entire Akash SAM system allows for attacking multiple targets (up to 4 per Battery). The Akash missile's use of ramjet propulsion system allows it to maintain its speed without deceleration, unlike the Patriot missiles. The missile is supported by a multi-target and multi-function phased array fire control radar called the 'Rajendra' with a range of about 80 km in search, and 60 km in terms of engagement.
The missile is completely guided by the Radar, without any active guidance of its own. This allows it greater capability against jamming as the aircraft self protection jammer would have to work against the high power Rajendra, and the aircraft being attacked is not alerted by any terminal seeker on the Akash itself.
Design of the missile is similar to that of the SA-6 with four long tube ramjet inlet ducts mounted mid-body between wings. For pitch/yaw control four clipped triangular moving wings are mounted on mid-body. For roll control four inline clipped delta fins with ailerons are mounted before the tail. However, internal schema shows a completely modernised layout, including an Onboard computer with special optimized trajectories, and an all digital Proximity fuse.
The Akash system meant for the Army uses the T-72 tank chassis for its launcher and radar vehicles. The Rajendra derivative for the Army is called the Battery Level Radar-III. The Air Force version uses an Ashok Leyland truck platform to tow the missile launcher, while the Radar is on a BMP-2 chassis and is called the Battery Level Radar-II. In either case, the launchers carry three ready-to-fire Akash missiles each. The launchers are automated, autonomous and networked to a command post and the guidance radar. They are slewable in azimuth and elevation. The Akash system can be deployed by rail, road or air.
The first test flight of Akash missile was conducted in 1990, with development flights up to March 1997.
The IAF has initiated the process to induct the Akash and Trishul surface-to-air missiles developed as a part of the Integrated Guided Missile Development Program. The Multiple target handling capability of Akash weapon system was demonstrated by live firing in a C4I environment during the trials. Two Akash missiles intercepted two fast moving targets in simultaneous engagement mode in 2005 itself. The Akash System's 3-D central acquisition radar (3-D car) group mode performance was then fully established
In December,2007 Indian Air Force completed user trials for the Akash missile system. The trials, which were spread over ten days were successful and the missile hit its target on all five occasions. Before the ten day trial at Chandipur, the Akash system's ECCM Evaluation tests were carried out at Gwalior Air force base while mobility trials for the system vehicles were carried out at Pokhran. The IAF had evolved the user Trial Directive to verify the Akash's consistency in engaging targets. The following trials were conducted: Against low flying near range target, long range high altitude target, crossing and approaching target and ripple firing of two missiles from the same launcher against a low altitude receding targetFollowing this, the IAF declared that it would initiate the induction of 2 squadrons strength (each squadron with 2 batteries) of this missile system, to begin with. Once deliveries are complete, further orders would be placed to replace retiring SA-3 GOA (Pechora) SAM systems.
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