Penguin
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Secondary surveillance radar - Wikipedia, the free encyclopediaSecondary surveillance radar (SSR)[1] is a radar system used in air traffic control (ATC), that not only detects and measures the position of aircraft i.e. range and bearing, but also requests additional information from the aircraft itself such as its identity and altitude. Unlike primary radar systems that measure only the range and bearing of targets by detecting reflected radio signals, SSR relies on targets equipped with a radar transponder, that replies to each interrogation signal by transmitting a response containing encoded data. SSR is based on the military identification friend or foe (IFF) technology originally developed during World War II, therefore the two systems are still compatible. Monopulse secondary surveillance radar (MSSR), Mode S, TCAS and ADS-B are similar modern methods of secondary surveillance.
Identification Friend or Foe (IFF) - BAE Systems
One might remove all markings....Wow this journalist is sherlock. Who would have thought that a Russian made Buk would have Russian cyrillics
Was the journalist expecting a Buk to have, for instance, Japanese text?