Ionospheric Threat Parameterization for Local Area Global-Positioning-System-Based Aircraft Landing Systems
Ionospheric Threat Parameterization for Local Area Global-Positioning-System-Based Aircraft Landing Systems
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DOI：
10.2514/1.46719
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发表时间：
2010-07-01
影响因子：
2.2
通讯作者：
Enge, Per
中科院分区：
文献类型：
--
作者：
Datta-Barua, Seebany;Lee, Jiyun;Enge, Per
文中给出了电离层电子含量极端空间变化率的观测结果，以及美国局域增强系统所采用的缓解策略。在极端电离层活动期间，全球导航卫星系统用户在距离地面参考站几公里处遇到的坡度可能高达每公里用户间隔425毫米的延迟(以全球定位系统L1频率计算)。描述了产生这些结果的数据分析方法，并定义了将这些可能对用户完整性的威胁参数化的威胁空间。用户、参考站、全球导航卫星系统卫星和电离层风暴增强密度的某些配置可能会抑制参考站对异常电离层的探测。
Observations of extreme spatial rates of change of ionospheric electron content and the characterization strategy for mitigation applied by the U.S. local area augmentation system are shown. During extreme ionospheric activity, the gradient suffered by a global navigation satellite system user a few kilometers away from a ground reference station may reach as high as 425 mm of delay (at the GPS L1 frequency) per km of user separation. The method of data analysis that produced these results is described, and a threat space that parameterizes these possible threats to user integrity is defined. Certain configurations of user, reference station, global navigation satellite system satellite, and ionospheric storm-enhanced density may inhibit detection of the anomalous ionosphere by the reference station.