Aircraft system and method for improving navigation performance

摘要

A high integrity navigation system and method are provided. The method comprises performing a cyclic redundancy check (CRC) of a desired flight path of an aircraft, for example an approach to an airport, and comparing the CRC with a stored CRC performed on the identified flight path. If the comparison exceeds a first threshold, a first alert is provided wherein the pilot is to perform a published missed approach. A second alert, also requiring a missed approach, is provided when one or more comparisons are performed of a sensor position of the aircraft with the high integrity flight path; a defined flight path with the high integrity flight path; and the sensor position with an aircraft position determined by a flight management system, and thresholds are exceeded.

主权项

1. A method allowing an aircraft to navigate by required navigation performance, the aircraft including a flight management system, a processor, and a display, the method comprising:
storing a plurality of flight paths and a first cyclic redundancy check for each of the flight paths in the flight management system; identifying one of the flight paths as a desired flight path in the flight management system;
providing the identified flight path to the display;displaying the desired flight path even if the identified flight path is no longer being received by the display; computing a second cyclic redundancy check by the processor for the desired flight path; comparing by the processor the first cyclic redundancy check of the identified flight path with the second cyclic redundancy check; providing a first alert signal by the processor to the display when the comparison of the first cyclic redundancy check of the identified flight path with the second cyclic redundancy check exceeds a first threshold; determining a sensor position of the aircraft by an external sensor of the aircraft; comparing within the processor the sensor position with the high integrity flight path; and providing by the processor a second alert signal and the high integrity flight path to the display when the comparison of the sensor position with the high integrity flight path exceeds a second threshold; displaying a first alert when the first alert signal is provided; and displaying a second alert when the second alert signal is provided.