Global ionospheric TEC inversion method based on galileo has service

Abstract

The invention relates to a global ionospheric TEC inversion method based on Galileo HAS service, including: acquiring correction information through the HAS service, preprocessing observation data of a reference station according to the correction information to obtain preprocessed carrier phase observations; calculating carrier phase ambiguities and purified carrier phase observations based on the preprocessed carrier phase observations; calculating the Slant Total Electron Content (STEC) according to the carrier phase ambiguities and the purified carrier phase observations; constructing a two-layer ionospheric network model based on the geographic coordinates of ionospheric piercing points and the STEC; and inverting the Vertical Total Electron Content (VTEC) using the Kalman filter based on the two-layer ionospheric network model to obtain and compress the ionospheric VTEC. The invention breaks through the network dependence of traditional ground-based augmentation and can still provide continuous and reliable ionospheric delay correction in scenarios such as oceans and deserts.