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secondary radar
commun. radar secondaire; radar secondaire de surveillance
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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: 31 phrases in 4 subjects
Aviation6
Communications4
Natural sciences2
Transport19

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