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Airborne Required Time of Arrival (RTA) Control and Integration with ATM

This paper describes a method of controlling the speed of an aircraft to meet a required time of arrival (RTA) constraint over one or multiple waypoints. The motivation of an airborne RTA system is first discussed, then the control system is described in detail. First the method for meeting a single RTA waypoint is developed, then it is extended to multiple RTA waypoint constraints. Results from testing the system in a laboratory environment are discussed. Additionally, concepts for negotiating 4D trajectory constraints with an Air Traffic Management (ATM) provider are presented, and RTA is shown to be a useful tool for flying aircraft in a practical manner to meet 4D trajectory constraints.