An aircraft navigation system and method of navigating an aircraft are proposed. The system (1) comprises a civil-certified GPS-receiver (3) for determining first position information based on C/A-GPS-signals and a military-type GPS-receiver (5) for determining a second position information based on P(Y)-GPS-signals. The system (1) is adapted to issue aircraft navigation signals based on the first position information when the aircraft is flying under normal navigation conditions in civil airspace. A monitoring unit (7) detects a first abnormal navigation condition upon occurrence of jamming conditions within the C/A-GPS-signals. Furthermore, it compares the first position information with the second position information and detects a second abnormal navigation condition upon occurrence of a difference between these position information being larger than a threshold value for more than a threshold duration. Upon detection of an abnormal navigation condition, an alert procedure such as transmitting a warning signal to a pilot is initiated. In a particular application in remotely piloted aircraft, Command & Control link-loss is additionally monitored and in case of link-loss, a transponder code is automatically set to issuing a signal indicating communication failure. Furthermore, when in such situation an abnormal navigation condition is additionally detected, a transponder code is set for issuing a signal indicating airborne emergency and, subsequently, the aircraft navigation system (1) is switched to navigating based on position information from the military-type GPS-receiver (5).
Aircraft navigation system and method of navigating an aircraft
Flugzeugnavigationssystem und Verfahren zur Navigation eines Flugzeugs
Système de navigation d'aéronef et procédé de navigation d'un aéronef
03.06.2020
Patent
Elektronische Ressource
Englisch
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