How does mode S identify each aircraft?(a) Unique code for each transponder(b) Lapsed time(c) RCS(d) Directly talking to the pilotThe question was posed to me in a job interview.This interesting question is from Modes S System topic in division Surveillance Systems, Mapping and Multimode Radars of Avionics

How does mode S identify each aircraft?(a) Unique code for each transp

1.	How does mode S identify each aircraft?(a) Unique code for each transponder(b) Lapsed time(c) RCS(d) Directly talking to the pilotThe question was posed to me in a job interview.This interesting question is from Modes S System topic in division Surveillance Systems, Mapping and Multimode Radars of Avionics
Answer» Right answer is (a) Unique code for each transponder Easiest explanation: Unlike the ATCRBS where a squawk code is dialed into the transponder, a MODE S transponder has a unique identity PERMANENTLY assigned to it. The mode S RADAR system can have more than 16 million different identities, enough for each airplane in the world to have a unique identity.

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