Kolchuga Passive Sensor
The Kolchuga (Кольчуга chain mail shirt) passive sensor is an ESM system developed in Ukraine. Its detection range is limited by line-of-sight but may be up to 800 km (500 mi) for very high altitude, very powerful emitters. Frequently referred to as Kolchuga Radar, the system is not really a radar, but an ESM system comprising three or four receivers, deployed tens of kilometres apart, which detect and track aircraft by triangulation and multilateration of their RF emissions.
Read more about Kolchuga Passive Sensor: History, Mode of Operation, Exports, Rumours and Speculation of Performance
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