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 Англійський тезаурус

secondary radar

авіац. A radar system wherein a radio signal transmitted from the radar station initiates the transmission of a radio signal from another station.
авіац., Канада A radar system that requires complementary aircraft equipment transponder. The transponder generates a coded reply signal in response to transmissions from the ground station interrogator. Since this system relies on transponder-generated signals rather than signals reflected from the aircraft, as in primary surveillance radar, it offers significant operational advantages such as increased range and positive identification.
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