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Mode S is a type of aircraft transponder used in conjunction with Secondary Surveillance Radar. Mode S equipped aircraft transmit an aircraft specific unique code, which can be used for selective interrogation by surveillance equipment.

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What are the radius of containment (Rc) and horizontal protection limit (HPL) and how are th...

In ICAO Document 9871 (Technical Provisions for Mode S Services and Extended Squitter) page 30 they have mentioned it in the form of a table. But they haven't explained HPL and Rc in detail.
Vinay Sunderganapathy's user avatar