Open AccessIonospheric spatial decorrelation assessment for GBAS daytime operations in Brazil
Author(s) -
Chang Hyeyeon,
Yoon Moonseok,
Pullen Sam,
MariniPereira Leonardo,
Lee Jiyun
Publication year - 2021
Publication title -
navigation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.847
H-Index - 46
eISSN - 2161-4296
pISSN - 0028-1522
DOI - 10.1002/navi.418
Subject(s) - daytime , decorrelation , ionosphere , gnss augmentation , environmental science , geodesy , meteorology , remote sensing , geology , geography , gnss applications , computer science , global positioning system , atmospheric sciences , telecommunications , geophysics , algorithm
Extensive ionospheric studies were conducted to support the initial phase of system design approval for the existing SLS‐4000 GBAS installed at Antonio Carlos Jobim International Airport (formerly Galeão International Airport) (GIG) in Rio de Janeiro, Brazil. This paper focuses on determining the broadcast value of the standard deviation of vertical ionospheric gradients (or σ vig ) that is required to bound ionospheric spatial gradients in Brazil under nominal conditions during daytime hours. The time‐step method is useful for gaining sufficient samples at distances less than the physical separation distance of ground stations and was utilized to estimate ionospheric spatial gradients. A new method called “geometric similarity” was developed to estimate ionospheric temporal gradients and evaluate the temporal effect added to the bounding σ vig values. As a result, a σ vig of 13 mm/km, including a temporal gradient contribution of approximately 2 mm/km, is conservative enough to bound ionospheric spatial decorrelation for daytime GBAS operations in Brazil.