An analysis of ionospheric changes applying the correlation of GPS measurements

Abstract

The variations of ionosphere influence on GPS measurements by correlation analysis of spatial geocentric coordinates are analysed in this paper. The condition of ionosphere is not stable, but it varies with time and space and its influence on GPS measurements relies on geometry of spread GPS satellite signals. There is no stable coordinate’s error of measured point for ionosphere influence. Values of coordinate’s covariations matrix for variation of geocentric rectangular coordinates ( ) Z Y X , , in single epochs for a definite period. Such values are available for coordinates which are determined by code and carrying phase measurements. The variations of ionosphere electrons content TEC (Total Electronic Content) in the definite period are estimated by values of covariations matrix.