GBAS Ionospheric Anomaly Monitoring Strategy Using Kullback-Leibler Divergence Metric
GBAS Ionospheric Anomaly Monitoring Strategy Using Kullback-Leibler Divergence Metric
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DOI：
10.1109/taes.2014.130498
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发表时间：
2015-01-01
影响因子：
4.4
通讯作者：
Heo, Moon-Beom
中科院分区：
文献类型：
--
作者：
Cho, Jeongho;Yun, Youngsun;Heo, Moon-Beom
对于地基增强系统（GBAS）来说，一个非常重要的显著异常是由罕见的电离层风暴引起的电离层延迟的陡峭梯度。为了避免这种危险的错误，代码载体发散（CCD）监视器已被应用于支持GBAS在I类（CAT I）操作中的使用。然而，为了满足CAT II/III操作的更严格要求，可能有必要大大提高现有CCD监测器探测电离层梯度的速度或开发一种创新的发散监测器。获得更严格完整性的一种方法是比CCD监视器更快地检测异常发散行为。因此，我们试图设计一个发散监测器，其中的检测时间减少使用Kullback-Leibler信息。在模拟和实验结果中，我们证明了所提出的发散措施是相当能够检测电离层异常，是危险的GBAS，是一个非常有前途的替代检测偏差。与现有的CCD监测器的比较表明，它的故障探测能力有所提高，这使它能够比典型的监测器更快地感应到甚至很小的电离层梯度。
A significant anomaly of great importance for ground-based augmentation systems (GBAS) is the steep gradient in ionospheric delays caused by rare ionospheric storms. To avoid such hazardous errors, code-carrier divergence (CCD) monitors have been applied to support the use of GBAS in Category I (CAT I) operation. However, to meet the stricter requirements for CAT II/III operation, it may be necessary to greatly improve the speed with which existing CCD monitors detect ionospheric gradients or develop an innovative divergence monitor. One way of obtaining stricter integrity is to detect anomalous divergence behavior more rapidly than the CCD monitor does. Therefore, we attempted to devise a divergence monitor in which the detection time is reduced by using the Kullback-Leibler information. In simulations and experimental results, we demonstrate that the proposed divergence measure is quite capable of detecting ionospheric anomalies that are hazardous to GBAS and is a very promising alternative for the detection of deviations. A comparison with existing CCD monitors shows its increased fault detectability, which enables it to sense even small ionospheric gradients more rapidly than typical monitors.