Navigation aid method for determining the path of an aircraft

摘要

Navigation aid method for determining, by an instruction giver, the path of an aircraft initially following a predetermined path in an approach phase and upon which are defined a safety altitude and an alarm limit, said aircraft including a navigation system of the INS/GNSS type including a satellite information receiver and at least one inertial unit producing position information, said method including determining a future path; estimating predicted protection radii on the future path are estimated, starting at the calculation time in the case of a critical situation, in terms of position information, which starts at the calculation time; calculating a limit time after which the predicted protection radius is greater than or equal to the alarm limit; and calculating a limit time after which the predicted protection radius is greater than or equal to the alarm limit.

主权项

1. A navigation aid method for determining, by an instruction giver, the path of an aircraft initially following a predetermined path in an approach phase and upon which are defined a safety altitude and an alarm limit, said aircraft comprising a navigation system of an Inertial Navigation System/Global Navigation Satellite System (INS/GNSS) type comprising a satellite navigation receiver and at least one inertial unit, said method comprising:
determining a current position of the aircraft; determining a future path of the aircraft from the current position; estimating a predicted protection radii on the future path, starting at a calculation time in a case of a critical situation, in terms of a loss of GNSS position information, which starts at the calculation time; calculating a limit time after which the predicted protection radius is greater than or equal to the alarm limit; calculating a limit extraction time that corresponds to a maximum time after which the aircraft must leave the predetermined path in order to be able to reach the safety altitude by the time limit; and transmitting the value of the limit extraction time to the instruction giver.