9

tl;dr We don't know. The US Government has not made enough information available to answer this question. The official Iranian and US reports contradict each other. Inofficial accounts of sailors on other USN vessels operating in the vicinity at the same time contradict both the official US report as well as statements made by Vincennes commanding officer. ...


4

Modes 3/A and C are very similar, but the interrogation pulses are timed differently and the responses mean different things. If you send a mode 3/A pulse, you get a mode 3/A reply (or nothing). The response is a 12-bit number called the squawk code, which is conventionally written as four octal digits, plus an optional ident bit. If you send a mode C ...


2

Just to clarify something to start, NAV CANADA is not a majority shareholder in Iridium Communications Inc., but rather Aireon LLC (the provider of space-based ADS-B service). The Aireon payload is a "hosted" on each of Iridium's NEXT satellites. NAV CANADA has completed its Aeronautical Study for a Canadian ADS-B Out Performance Requirements Mandate and ...


1

In simplistic terms you can view Mode S as an "enhancement" of the Mode 3/C/A. Mode S changed the way transponders were interrogated by allowing the radar to interrogate one target at a time. This prevented overlapping returns from multiple closely spaced aircraft that caused positioning errors on the radar operators display. Mode S is the same format as ...


Only top voted, non community-wiki answers of a minimum length are eligible