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Sensors 2016, 16(6), 763; doi:10.3390/s16060763

GBAS Ionospheric Anomaly Monitoring Based on a Two-Step Approach

1
College of Automation, Harbin Engineering University, Harbin 150001, China
2
Academy of Opto-Electronics, Chinese Academy of Sciences, Beijing 100094, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio Passaro
Received: 26 January 2016 / Revised: 13 April 2016 / Accepted: 19 May 2016 / Published: 26 May 2016
(This article belongs to the Section Remote Sensors)
View Full-Text   |   Download PDF [2308 KB, uploaded 26 May 2016]   |  

Abstract

As one significant component of space environmental weather, the ionosphere has to be monitored using Global Positioning System (GPS) receivers for the Ground-Based Augmentation System (GBAS). This is because an ionospheric anomaly can pose a potential threat for GBAS to support safety-critical services. The traditional code-carrier divergence (CCD) methods, which have been widely used to detect the variants of the ionospheric gradient for GBAS, adopt a linear time-invariant low-pass filter to suppress the effect of high frequency noise on the detection of the ionospheric anomaly. However, there is a counterbalance between response time and estimation accuracy due to the fixed time constants. In order to release the limitation, a two-step approach (TSA) is proposed by integrating the cascaded linear time-invariant low-pass filters with the adaptive Kalman filter to detect the ionospheric gradient anomaly. The performance of the proposed method is tested by using simulated and real-world data, respectively. The simulation results show that the TSA can detect ionospheric gradient anomalies quickly, even when the noise is severer. Compared to the traditional CCD methods, the experiments from real-world GPS data indicate that the average estimation accuracy of the ionospheric gradient improves by more than 31.3%, and the average response time to the ionospheric gradient at a rate of 0.018 m/s improves by more than 59.3%, which demonstrates the ability of TSA to detect a small ionospheric gradient more rapidly. View Full-Text
Keywords: GPS receiver; ionospheric gradient anomaly; CCD; two-step approach (TSA); response time; estimation accuracy; detection sensitivity GPS receiver; ionospheric gradient anomaly; CCD; two-step approach (TSA); response time; estimation accuracy; detection sensitivity
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhao, L.; Yang, F.; Li, L.; Ding, J.; Zhao, Y. GBAS Ionospheric Anomaly Monitoring Based on a Two-Step Approach. Sensors 2016, 16, 763.

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