Impact Analysis of Satellite Geometry Variation on ARAIM Integrity Risk over Exposure Interval

Accurate integrity risk evaluation is of significance in ensuring that aviation navigation applications satisfy the predefined integrity requirement. The integrity risk evaluation method over a specified exposure interval has been proposed in previous works for the development of advanced receiver a...

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Published inRemote sensing (Basel, Switzerland) Vol. 16; no. 2; p. 286
Main Authors Li, Ruijie, Li, Liang, Duan, Yangwang, Xu, Xin, Liu, Zelin
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.01.2024
Subjects
Aircraft
Algorithms
ARAIM
Civil aviation
Evaluation
Exposure
exposure interval
Geometry
global navigation satellite system
Global positioning systems
GPS
Impact analysis
Integrity
integrity risk
Outages
Risk assessment
satellite outage
Sensitivity analysis
Simulation
Subgroups
Variation
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Summary:Accurate integrity risk evaluation is of significance in ensuring that aviation navigation applications satisfy the predefined integrity requirement. The integrity risk evaluation method over a specified exposure interval has been proposed in previous works for the development of advanced receiver autonomous integrity monitoring (ARAIM) (ARAIM technical subgroup reference airborne algorithm description document v4.1, 2022). However, this method typically relies on an underlying optimistic assumption that the satellite geometry remains constant throughout the exposure interval. The variation in satellite geometry due to potential satellite outages undermines the widely-used geometry constant assumption. Thus, we investigate the influence of satellite geometry variations throughout the exposure interval on the integrity performance by introducing a geometry-sensitive risk-evaluation model. The findings demonstrate that, under the nominal situation, the region where the ARAIM fails to meet predefined integrity requirement could expand by a maximum of 2.93% when accounting for satellite geometry variations. Furthermore, in the situation of a single satellite outage, this hazardous region has significantly expanded from 13.12% of the global coverage to 66.82%. Based on these findings, we recommend that the ARAIM should consider satellite outages as a critical factor in real-time integrity risk evaluation.
ISSN:2072-4292
2072-4292
DOI:10.3390/rs16020286