If you have an ADS-B receiver, it will receive only aircraft in sight of the antenna (assuming sufficient signal strength). Since ADS-B operates on such high (UHF) frequencies, it is a line-of-sight system.
ADS-B on 1090 is essentially a modified Mode S transponder. 978MHz frequency reduces message congestion on 1090MHz. In some regions, aircraft may receive temporary flight restrictions (TFRs) and notices to airmen (NOTAMs), for example.ĪDS-B data links operate at 1090MHz or 978MHz. So, the aircraft is telling ADS-B receivers where it is.ĪDS-B is bi-directional, too. Position is determined by on-board GPS and altimeter data. In the case of commercial aircraft, the call sign is typically the airline and flight number. Aircraft are identified by a 24-bit ICAO address and (optional) call sign. Who came up with that acronym?) Aircraft carry an ADS-B transmitter which broadcasts identification and positional information. (“ADS-B” stands for “Automatic Dependent Surveillance-Broadcast”. Watching ADS-B “flight radar” has been cheap entertainment and a window into the larger world.ĪDS-B, in case you didn’t know, is an alternative means for tracking aircraft.
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