BHUBANESWAR, India, (Agencies) Indias home-grown interceptor defence shield developed to detect and destroy incoming ballistic missiles on Monday encountered coordination problem and failed to take off during a planned launch from the Integrated Test Range at Wheeler Island off Orissa coast. Coordinated exercise between target missile Prithvi from Chandipur and the indigenously built interceptor from Wheeler Island could not take place properly during the planned trial, defence sources said. The trial, part of efforts to develop a fully-fledged multi-layer Ballistic Missile Defence System, was earlier scheduled for Sunday but was postponed to today following some technical snags in the sub-system. The test-fire was carried out from two different launch sites of ITR. The target missile first lifted off from a mobile launcher from the ITRs launch complex at Chandipur-on-sea. As per plan, the interceptor missile was to blast off from the Wheelers Island within minutes of the launch of the target to intercept it at an altitude of 15 to 20km in mid-air over the waters. But, as per reports, the Prithvi target missile, following its launch at 10:02am followed the course for 11km and then unexpectedly deviated from its trajectory, due to which the interceptor missile radars did not get activated towards the potential threat and hence the interceptor did not take off in pursuit of the target. The seven-metre new Advanced Air Defence (AAD) interceptor missile is a single stage solid rocket-propelled guided missile equipped with an inertial navigation system, a hi-tech computer and an electro-mechanical activator totally under command by the data uplinked from the ground based radar, they said. The missile has its own mobile launcher, secure data link for interception, independent tracking and homing capabilities and its own radar. The Defence Research and Development Organisation (DRDO) had already test-fired the interceptor missile thrice on November 27, 2006, December 6, 2007 and March 6, 2009 from the Wheeler Island.