5 Automatic dependent surveillance-broadcast
David Wyatt, Mike Tooley · 2013
The development of Mode S has led onto two related systems: traffic alert and collision avoidance systems (TCAS) and automatic dependent surveillance-broadcast (ADS-B). Both systems can exchange data directly between aircraft. TCAS is a surveillance system that provides warnings directly to the crew when other navigation systems (including ATC) have failed to maintain safe separation of aircraft. ADS-B is an emerging technology for air traffic management (ATM) that is intended to replace conventional secondary surveillance radar. TCAS is addressed in the Chapter 22; ADS-B is described below.