METHOD FOR OPTIMALLY ADJUSTING GIVE ERROR BOUNDS OR FOR OPTIMALLY CALCULATING RESIDUAL VARIANCES OF IGP POINTS OF AN IONOSPHERIC GRID FOR CORRECTING AN SBAS SYSTEM AND SBAS SYSTEM FOR CARRYING OUT SAID METHOD

摘要

A method of optimally adjusting GIVE ionospheric correction error terminals and / or a method for calculating IGP dot residue variances of an ionospheric correction grid of an SBAS system each comprises a reverse interpolation step ( 220) implemented on a set of observation IPPi piercing points. In the optimal GIVE adjustment method, the inverse interpolation step (220) disseminates for each observation piercing point IPPi concerned a variance increment "UIVE i 2 on the IGP points of the mesh of said IPPi using a least squares method. In the calculation of the residue variances, the inverse interpolation step disseminates for each IPPi observation piercing point concerned a Resf residue on the IGP points of the mesh of said IPPi using a least squares method.