An Improved Ionospheric Delay Correction Method for SBAS

Abstract

The existing ionospheric delay correction methods in Satellite based augmentation system (SBAS) were just for single constellation and over conservative. In this paper, we propose a new method to make more accurate ionospheric delay correction and tighter error bound orienting towards GPS and GLONASS. Considering that some Ionospheric pierce points (IPPs) are almost motionless, we make a filtering process to estimate the ionospheric delays at Ionospheric grid points (IGPs) to better reflect the ionospheric temporal variation. Then we conduct a simulation on ionospheric delay estimation at IGPs in dual constellations through planar fit method and filtering method. It can be concluded that the filtering method can bound the ionospheric delay correction error more tightly, simultaneously the ionospheric delay correction accuracy is improved a bit.

Optimal Global Positioning System/European Geostationary Navigation Overlay Service Positioning Model Using Smartphone

“…The impact of the ionospheric correction on GNSS/SBAS positioning has been the subject of many scientific studies [31][32][33][34][35][36]. According to [30], its value is determined by either an SBAS model or a classical model based on the Klobuchar algorithm.…”