Voting system and method using doppler aided navigation

摘要

A position determining voting system that uses Doppler information from an on-board weather radar to improve the system's accuracy and/or fault tolerance includes a comparison function and an error integration function. The comparison function is used to monitor the independent position sources for correct operation, comparing and identifying a position source that should not be used based on its relative error compared with the other position sources and their characteristics. The integration function provides corrections to relative position sources by integrating the data from multiple absolute position sources when they are mutually consistent.

主权项

1. A method of estimating position for an aircraft, the method comprising:
receiving first position data and first accuracy data from a first absolute position source; receiving second position data and second accuracy data from a second absolute position source; receiving relative position source data from at least one relative position source, the relative position source data being provided using correction data; using the first position data and the second position data to update the correction data when the first position data and the second position data are within performance limits determined using the first accuracy data and the second accuracy data; and providing the first position data at a first output when the first position data is within an accuracy of the second position data and providing the second position data at a second output when the second position data is within an accuracy of the first position data and providing the relative position source data to the first output, the second output or both the first output and the second output when either the first position data is not within the accuracy of the second position data or the second position data is not within the accuracy of the first position data.