TY - GEN
T1 - Impact of Ionospheric Anomalies on Dual-Frequency GBAS with Divergence-Free Smoothing Technique
AU - Li, Wang
AU - Jiang, Yiping
N1 - Funding Information:
The work in this paper is funded by RGC 25202520. This support is gratefully acknowledged.
Publisher Copyright:
© 2022 Proceedings of the International Technical Meeting of The Institute of Navigation, ITM. All rights reserved.
PY - 2022/1/25
Y1 - 2022/1/25
N2 - A major threat for Ground Based Augmentation System (GBAS) is ionospheric anomalies caused by spatial or temporal decorrelation. With the introduction of GPS L1/L5 and Galileo E1/E5 signals, GBAS is evolving from single-frequency to dual-frequency implementation. This paper provides simulation analysis to assess the impact of ionospheric anomalies on dual-frequency GBAS with divergence-free smoothing technique. Based on middle-latitude and low-latitude ionospheric threat models, the analysis is designed to confirm that the performance requirements could be met by the combination of ground Wide-Lane Ionospheric Gradient Monitor (WL IGM) and airborne Dual Smoothing Ionosphere Gradient Monitor Algorithm (DSIGMA). The analysis and simulation results demonstrate that the system successfully satisfy the performance requirements under these threat models. Furthermore, the largest differential range error under wedge gradient and plasma bubble threat models with Probability of Missed Detection (PMD) larger than 10-9 are 2.19 m and 2.29 m, respectively. The differential range error reach maximum when the direction from ground facility (GF) to landing threshold point (LTP) is parallel to the wedge gradient or plasma bubble moving direction.
AB - A major threat for Ground Based Augmentation System (GBAS) is ionospheric anomalies caused by spatial or temporal decorrelation. With the introduction of GPS L1/L5 and Galileo E1/E5 signals, GBAS is evolving from single-frequency to dual-frequency implementation. This paper provides simulation analysis to assess the impact of ionospheric anomalies on dual-frequency GBAS with divergence-free smoothing technique. Based on middle-latitude and low-latitude ionospheric threat models, the analysis is designed to confirm that the performance requirements could be met by the combination of ground Wide-Lane Ionospheric Gradient Monitor (WL IGM) and airborne Dual Smoothing Ionosphere Gradient Monitor Algorithm (DSIGMA). The analysis and simulation results demonstrate that the system successfully satisfy the performance requirements under these threat models. Furthermore, the largest differential range error under wedge gradient and plasma bubble threat models with Probability of Missed Detection (PMD) larger than 10-9 are 2.19 m and 2.29 m, respectively. The differential range error reach maximum when the direction from ground facility (GF) to landing threshold point (LTP) is parallel to the wedge gradient or plasma bubble moving direction.
UR - http://www.scopus.com/inward/record.url?scp=85147945462&partnerID=8YFLogxK
U2 - 10.33012/2022.18248
DO - 10.33012/2022.18248
M3 - Conference article published in proceeding or book
AN - SCOPUS:85147945462
T3 - Proceedings of the International Technical Meeting of The Institute of Navigation, ITM
SP - 1145
EP - 1155
BT - Proceedings of the 2022 International Technical Meeting of The Institute of Navigation, ITM 2022
PB - The Institute of Navigation
T2 - 2022 International Technical Meeting of The Institute of Navigation, ITM 2022
Y2 - 25 January 2022 through 27 January 2022
ER -