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首页> 外文期刊>Aerospace and Electronic Systems, IEEE Transactions on >GBAS ionospheric anomaly monitoring strategy using Kullback-Leibler divergence metric
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GBAS ionospheric anomaly monitoring strategy using Kullback-Leibler divergence metric

机译：使用Kullback-Leibler发散度量的GBAS电离层异常监测策略

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摘要

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.
机译：对于地面增强系统（GBAS），一个非常重要的重大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。为避免此类危险错误，已应用代码载波发散（CCD）监视器来支持在类别I（CAT I）操作中使用GBAS。但是，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监视器检测电离层梯度的速度或开发创新的发散监视器。获得更严格的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，我们试图设计一种发散监测器，通过使用Kullback-Leibler信息来缩短检测时间。在仿真和实验结果中，我们证明了所提出的发散度量非常有能力检测对GBAS有害的电离层异常，并且是偏差检测的非常有希望的替代方法。与现有CCD监视器的比较表明，它具有更高的故障检测能力，这使其能够比典型监视器更快地检测甚至很小的电离层梯度。

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