Quote:
Originally Posted by Hom3r
ADS-B IIRC is radar IFF (Identifation Friend or Foe) stuff, tells you stuff about the plane, I used to progame ICs & IFF Boards in a previos life.
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Kind of. The IFF function is more a feature of Secondary Surveillance Radar which relies on an ATC ground station interrogating the transponder of an aircraft (mode C and more recently Mode S) which will return it's altitude based on air pressure just like the altimeter on board.
This is traditionally used in conjunction with a "squawk" code assigned by ATC which the pilot will set on the transponder and the result of Primary surveillance radar (the big radar dish that spins around on the airfield or sits inside a golfball on top of a hill) returns merged onto the controller's display.
ADS-B is a system where aircraft will automatically transmit position data without being interrogated so it is potentially a replacement for Secondary Surveillance Radar. As it stands though there is no security around ADS-B and it is possible to spoof and falsify packets as there is no authentication in the signal chain so we're some way of before this will be able to happen.
Oi! you can wake up now
