System and method for aircraft navigation assistance

摘要

This aircraft navigation assistance system comprises an inertial navigation module adapted for providing first positional information from accelerometric and gyrometric measurements, and a module adapted for determining second positional information from satellite positioning data. The system is characterized in that it comprises means for estimating a first localization of the aircraft at a time of estimation on the basis of first positional information determined from accelerometric and gyrometric measurements at said time of estimation and second positional information determined from positioning data received prior to said time of estimation, said first localization being determined independently from any positioning data received in a time interval preceding said time of estimation, advantageously equal to a time to alert.

主权项

1. A navigation assistance system to be used on board an aircraft, comprising:
an inertial navigation module, adapted for providing first aircraft positional information resulting at least partially from accelerometric and gyrometric measurements, a satellite positioning module, comprising at least one satellite navigation data receiver, said positioning module being adapted for determining second aircraft positional information from satellite positioning data received by said satellite navigation data receiver, said system comprising estimation means adapted for estimating a first localization of the aircraft at a given time of estimation on the basis of: first aircraft positional information, resulting at least partially from accelerometric and gyrometric measurements at said time of estimation, and second aircraft positional information, determined from satellite positioning data received by said satellite navigation data receiver prior to said time of estimation, said first localization being determined independently from any satellite positioning data received in a predetermined time interval preceding said time of estimation and including said time of estimation, said predetermined time interval being advantageously equal to a time to alert, wherein said satellite positioning module comprises means for validating or invalidating said satellite positioning data, depending on the precision of said satellite positioning data and/or depending on the operating mode of said satellite positioning module, wherein the second aircraft positional information includes an estimate of a position of the aircraft at least at a given time of determination and an estimate of a precision of said position, determined from satellite positioning data, and in that said satellite positioning module is adapted for comparing the estimate of the precision of said position to a required minimum precision at said time of determination, and validating said satellite positioning data, at a validation time after said time of determination, if the estimate of the precision of said position is in accordance with said required minimum precision, the time interval between said time of determination and said validation time being less or equal to said time to alert.