| http://www.w3.org/ns/prov#value | - in fact it is mainly one-way, as no signals bounce off. interrogation code trains are sent by the secondary/iffsiff/mssr, whatever it may be called for the technology it uses, to the transponder of the aircraft. the aircraft replies...the orientation of the reply in respect to the secondary radar antenna is estimated using fancy sidelobe techniques and stuff i do not remember and determines the loca
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