A new ELINT/ESM payload designed specifically for UAVs was unveiled by Rafael at the Farnborough International 2002 air show. The system designated "Top Scan" is based on an advanced airborne direction finding and localization system. Utilizing a compact dual-axis interferometer for direction finding (DF) and localization sensors, which can be installed in the nose of the aerial vehicle, Top Scan is also integrated with a miniature low-weight receiver and processor, which can be located in the avionics compartments of the UAV. The system provides collection, detection and measurement of surface emitters, for identification and high resolution localization of potential targets, in a dense emitter environment, even in the presence of multi-path and interference. Such emitters are commonly associated with command, control and direction radars for missiles and other air defense systems.