Assessment and mitigation of equatorial plasma bubble impacts on category I GBAS operations in the Brazilian region

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Prior to initiating GBAS service in equatorial regions, it is vital to evaluate potential integrity threats posed by equatorial plasma bubble (EPB)-induced ionospheric gradients and assess availability when implementing ionospheric threat mitigation methods. Earlier work developed a preliminary EPB model with a gradient bound larger than twice that for mid-latitude ionospheric storms. Position-domain geometry screening (PDGS) with this higher gradient bound decreases availability to 58.3% at the Galeao International Airport, Brazil, during nighttime. A new mitigation method using Monte Carlo simulation randomizes ionospheric scenarios using randomly generated parameter combinations within the threat model and assesses the ensemble impacts. By taking credit for a prior probability of an extreme EPB, this algorithm determines the inflated integrity parameters to meet the safety requirement in the probabilistic definition. This paper shows that with this method, the system availability for category I precision approaches dramatically improved to 89.6% when a data-driven prior probability of 10-5 was applied.
Publisher
WILEY PERIODICALS, INC
Issue Date
2019-09
Language
English
Article Type
Article
Citation

NAVIGATION-JOURNAL OF THE INSTITUTE OF NAVIGATION, v.66, no.3, pp.643 - 659

ISSN
0028-1522
DOI
10.1002/navi.328
URI
http://hdl.handle.net/10203/270056
Appears in Collection
AE-Journal Papers(저널논문)
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