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secondary radar
avia. 二次雷达
space 辅助［二级; 次级］雷达
tech. 应答器; 应答雷达; 次级雷达
 English thesaurus
secondary radar
avia., Canada 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.
secondary radar: 18 phrases in 5 subjects
Air defense3
Aviation3
Electronics4
General1
Space7

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