ADS-B

ADS-B, or Automatic Dependent Surveillance aircraft Broadcast is a relatively new method of communications, navigation and surveillance of free-moving bodies in the sky. Notably aircraft.

Unlike radar, which bounces radio waves in general broadcast off of airborne entities, and attempts to triangulate, ADS-B uses GNSS and broadcast comms. It effectively networks all airborne craft in a grid.

ADS-B accuracy does not seriously degrade with range, atmospheric conditions, or target altitude and update intervals do not depend on the rotational speed or reliability of mechanical antennas.

ADS-B capable aircraft uses GPS to determine its precise position from GNSS, then combines that position with speed, heading, altitude and flight number. This is then broadcast both to the ground, and to other aircraft, forming a redundant grid of data.

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ADS-B

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