For the third time in five days, India test-fired two indigenously developed surface-to-air anti-aircraft 'Akash' missiles from the Integrated Test Range at Chandipur near here.

The double test-fire came after trials of the missile, with a range of 25 km and capable of carrying a warhead of 60 kg to neutralise aerial targets, on May 24 and 26.

"The flight trial of two Akash missiles were conducted in quick succession from road mobile launchers at launch pad-3 in the ITR at about 1102 hours," defence sources said.

"During the trial, the missiles were aimed at intercepting a floating object supported by a pilotless target aircraft flown from launch complex-II at a definite altitude over the sea," the sources said.

"It was a routine user trial conducted by the Indian defence forces after the completion of developmental test and induction into the defence armoury," an official of the Defence Research and Development Organisation (DRDO) said.

Soon after the launch, assesment of the test was done with the help of all data retrived from telemetry stations and radars, they said.

Akash, an anti-aircraft defence system, could simultaneously engage several targets with 'Rajendra' radar developed by Electronics and Radar Development Establishment (LRDE), a DRDO laboratory in Bangalore.

The radar carries out the surveillance, tracks the target, acquires it and guides the missile towards it.

Rajendra is a 'passive phased array radar'. It is a multifunction radar, capable of tracking 64 targets and controlling up to 12 missiles simultaneously.

Defence experts have compared Akash missile system with the American MIM-104 Patriot surface-to-air missile system.

They claim that similar to the MIM-104, the Akash is capable of neutralising aerial targets such as unmanned aerial vehicles (UAVs), fighter jets, cruise missiles and air-to-surface missiles.

The development of Akash missile took place during 1990s under the country?s Integrated Guided Missile Development Programme (IGMDP) and after many trials, it was inducted into the armed forces. The anti-aircraft missile is already part of the Army and the Air-force.