HYBRID INERTIAL/STELLAR NAVIGATION METHOD WITH HARMONIZATION PERFORMANCE INDICATOR

The invention relates to a navigation method of a vehicle (A) equipped with a star tracking device (3), a first inertial measurement device (320) and a satellite positioning device (2), the star tracking device and the first inertial measurement device being rigidly connected to a single support (312), the method comprising the steps of: controlling movements of the support according to different tracking headings of the star tracking device; simultaneously with these movements, calculating, in a horizontal plane, first positions of the vehicle on the basis of a first navigation algorithm using stellar measurements, and second positions of the vehicle on the basis of a second navigation algorithm using first inertial measurements from the first inertial measurement device coupled with satellite measurements; calculating first deviations between the first positions and the second positions corresponding to each tracking heading and depicting them in a polar reference frame (P) as a function of the corresponding heading and the values of the first deviations; carrying out a circular regression on said first deviations in order to determine, in this polar reference frame, a first circle (C1) representative of all the first deviations; and determining a radius (r1) of the circle and a second deviation between a centre (o1) of the first circle and an origin (O) of the polar reference frame.