Valdkond ICAO lisade põhjal loodud klassifikaatori järgi: Lennuliikluse korraldamine
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Monopulse Secondary Surveillance Radar is a technique developed to overcome two common problems with surveillance radar systems.* When several aircraft are in close proximity, or are located in the same direction, their Transponder replies can overlap due to the finite size of the anntenna beam width (typically 2-3 degrees). When this happens, the ground decoder becomes confused and the information is lost. This problem is known as 'Garbling'. * When many aircraft are in the vicinity, responses transmitted by some of these may be interpreted as being from the interrogated SSR, causing confusion and error. This problem is known as 'Fruit'. These problems are resolved by analysing the received signals using a computer and by transmitting from the radar at a much reduced rate (about one tenth of the previously used rate). As a result, Garbling and Fruit are reduced by about 90% while directional accuracy is tripled compared to conventional SSR.
