The antenna beam becomes wider as the aircraft gets farther away, maki... - dofaq.co
automatic dependent surveillance broadcast

The antenna beam becomes wider as the aircraft gets farther away, maki...

wikipedia - 07 Aug 2015
The antenna beam becomes wider as the aircraft gets farther away, making the position information less accurate. Additionally, detecting changes in aircraft velocity requires several radar sweeps that are spaced several seconds apart. In contrast, a system using ADS-B creates and listens for periodic position and intent reports from aircraft. These reports are generated based on the aircraft's navigation system, and distributed via one or more of the ADS-B data links. The accuracy of the data is no longer s

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