Patent ID: 7908046

Claim:
A method for monitoring a position indication of an aircraft, said position indication representing a current position of the aircraft, which is determined with the aid of information arising from an onboard positioning section, which cooperates with a satellite positioning system, and of inertial information generated by an onboard inertial system, the method comprising the following series of successive operations that are carried out in an automatic and repetitive manner: a) determining at least one first position error which represents an estimated maximum error of said position indication of the aircraft; b) determining at least one second position error which represents an estimated maximum error of the position of the aircraft for a particular future duration, and which depends on a problem in determining said position indication; c) summing said first and second position errors so as to obtain a global error; d) comparing the global error with at least one threshold value which depends on flight constraints of the aircraft, which must fly inside a predetermined flight corridor; and e) emitting an alarm signal if said global error is greater than said threshold value.