Open AccessAn Improved Ionospheric Delay Correction Method for SBAS
Author(s) -
Shan Wang,
Ding Wang,
Yingxuan Guan
Publication year - 2021
Publication title -
chinese journal of electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.267
H-Index - 25
eISSN - 2075-5597
pISSN - 1022-4653
DOI - 10.1049/cje.2021.02.006
Subject(s) - ionosphere , computer science , global positioning system , glonass , satellite , gnss applications , algorithm , telecommunications , geology , physics , geophysics , astronomy
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.