The Primary Radar (PR), a major sensor of the AEW&C system, is a long range multimode radar. The major role of PR is to provide surveillance for air defence and early warning together with capability of aiding in tactical missions or in offensive strikes. It is a solid state fully active electronically steered active array (ESA) radar mounted on the dorsal unit of EMB-145 executive jet aircraft. The radar has monopulse processing capability in azimuth and elevation.