Assessment of Ionospheric Gradient Impacts on Ground-Based Augmentation System (GBAS) Data in Guangdong Province, China.
Assessment of Ionospheric Gradient Impacts on Ground-Based Augmentation System (GBAS) Data in Guangdong Province, China.
复制标题
中国广东省电离层梯度对地基增强系统（GBAS）数据的影响评估
DOI：
10.3390/s17102313
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发表时间：
2017-10-11
期刊：
影响因子：
--
通讯作者：
Xin P
中科院分区：
文献类型：
--
作者：
Wang Z;Wang S;Zhu Y;Xin P
电离层延迟是地面增强系统(GBAS)用户的最大和最可变的误差来源之一，因为电离层活动是不可预测的。在正常情况下，GBAS消除了电离层延迟，但在极端电离层风暴期间，GBAS用户和GBAS地面设施可能会经历不同的电离层延迟，导致相当大的差别误差，并威胁用户的安全。因此，电离层监测和评估是GBAS完整性监测的重要组成部分。为了研究电离层对广东省大气边界层的影响，中国利用改进的“Simple Truth”算法对广东省65个基准站的GPS数据进行了处理。此外，还计算了广东省的电离层特征，建立了电离层威胁模型。最后，我们评估了标准差和最大电离层梯度对GBAS的影响。结果表明，在正常电离层条件下，对于最大的越界σVIG(垂直电离层梯度的Sigma)，GBAS的垂直保护水平提高了0.8m，在最大电离层梯度条件下，差分改正误差可能达到5m。从适航的角度来看，当卫星在低海拔时，这种干扰不会造成适航风险，但当卫星在高海拔时，这种干扰会造成适航风险。
Ionospheric delay is one of the largest and most variable sources of error for Ground-Based Augmentation System (GBAS) users because inospheric activity is unpredictable. Under normal conditions, GBAS eliminates ionospheric delays, but during extreme ionospheric storms, GBAS users and GBAS ground facilities may experience different ionospheric delays, leading to considerable differential errors and threatening the safety of users. Therefore, ionospheric monitoring and assessment are important parts of GBAS integrity monitoring. To study the effects of the ionosphere on the GBAS of Guangdong Province, China, GPS data collected from 65 reference stations were processed using the improved “Simple Truth” algorithm. In addition, the ionospheric characteristics of Guangdong Province were calculated and an ionospheric threat model was established. Finally, we evaluated the influence of the standard deviation and maximum ionospheric gradient on GBAS. The results show that, under normal ionospheric conditions, the vertical protection level of GBAS was increased by 0.8 m for the largest over bound σvig (sigma of vertical ionospheric gradient), and in the case of the maximum ionospheric gradient conditions, the differential correction error may reach 5 m. From an airworthiness perspective, when the satellite is at a low elevation, this interference does not cause airworthiness risks, but when the satellite is at a high elevation, this interference can cause airworthiness risks.
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作者：
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