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Abstract

Systems and methods for controlling an aircraft to hold altitude using GPS altitude readings. One example system includes a GPS inertial navigation system, an altimeter, a human machine interface, and one or more electronic processors coupled to the GPS inertial navigation system, the altimeter, and the human machine interface. The one or more electronic processors configured to receive, from the human machine interface, a user input selecting a reference altitude. The one or more electronic processors configured to receive, from the altimeter, a current altitude for the aircraft. The one or more electronic processors configured to: when the current altitude does not exceed an altitude threshold, operate the aircraft in an altimeter altitude hold mode based on the reference altitude; and when the current altitude exceeds the altitude threshold, operate the aircraft in a GPS altitude hold mode based on the reference altitude using the GPS inertial navigation system.

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First Claim