About ASTRA : From various sources....
A DRDO missile technologist explained that if the enemy aircraft were to fly close, it would be registered in the cockpit of the LCA. If the enemy aircraft were to fly, say 10 km away, it cannot be detected by the instruments in the cockpit. So it is beyond visual range; only radar signals will be received. The enemy aircraft too would be moving at a high speed. Astra would adjust its own speed to that of the enemy aircraft and home in on it.
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Significantly, the Astra can be launched even before its intended target is in visual range. Its sophisticated electronics then guide it to the target while helping it to avoid detection by enemy radars.
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The ambitious multi-million dollar programme called the Integrated Guided Missile Development Programme (IGMDP), launched in 1982-83, has travelled a long way and is set to enter an exciting new phase which will see the development of ASTRA — the beyond visual range missiles, technology upgradation to have precision missiles with seek and "hit to kill" capabilities.
Today, sending a warhead on a missile any distance, anywhere is behind us. We are working on ASTRA, the beyond the visual range (BVR) missile, which on detecting a signal can be launched to seek and home in on a target. One flight is expected to be undertaken at the end of 2004. A formal project sanction is expected now and will take at least three-four years to complete development work. ASTRA will have a RF seeker. Interestingly, an LCA interface has also been worked out.
(Dr V. K. Saraswat, Director, Research Centre Imarat in an interview)
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Astra specifications:
Length: 3570 mm
Body Diameter: 178 mm
Wing Span: N/A
Launch Weight: 154 kg.
Warhead: 15 kg pre-fragmented directional.
Fuze: Radar Proximity (laser proximity to follow).
Guidance: A combination of inertial mid-course guidance with data-linked targeting updates , active-radar terminal homing.
Propulsion: Solid rocket motor (ramjet propulsion to follow).
Speed: Mach 4+
Maximum altitude: 20 km
Range: 100 km , 15 km tail chase.