Mode S Air traffic control radar beacon system

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mode s, or mode select, despite being called mode, radically improved system intended replace atcrbs altogether. few countries have mandated mode s, , many other countries, including united states, have begun phasing out atcrbs in favor of system. mode s designed backward compatible existing atcrbs technology.


mode s, despite being called replacement transponder system atcrbs, data packet protocol can used augment atcrbs transponder positioning equipment (radar , tcas).


one major improvement of mode s ability interrogate single aircraft @ time. old atcrbs technology, aircraft within beam pattern of interrogating station reply. in airspace multiple interrogation stations, atcrbs transponders in aircraft can overwhelmed. interrogating 1 aircraft @ time, workload on aircraft transponder reduced.


the second major improvement increased azimuth accuracy. psrs , old ssrs, azimuth of aircraft determined half split (centroid) method. half split method computed recording azimuth of first , last replies aircraft, radar beam sweeps past position. midpoint between start , stop azimuth used aircraft position. mssr (monopulse secondary surveillance radar) , mode s, radar can use information of 1 reply determine azimuth. calculated based on rf phase of aircraft reply, determined sum , difference antenna elements, , called monopulse. monopulse method results in superior azimuth resolution, , removes target jitter display.


the mode s system includes more robust communications protocol, wider variety of information exchange. @ time, capability becoming mandatory across europe states requiring use.







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