An examination of the Galileo NeQuick model: comparison with GPS and JASON TEC

An examination of the Galileo NeQuick model: comparison with GPS and JASON TEC
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Galileo NeQuick 模型的检查:与 GPS 和 JASON TEC 的比较

DOI:
10.1007/s10291-016-0553-x
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发表时间:
2017-04
期刊:
影响因子:
4.9
通讯作者:
Li Min
Li Min
中科院分区:
工程技术1区
文献类型:
--
作者:
Wang Ningbo;Yuan Yunbin;Li Zishen;Li Ying;Huo Xingliang;Li Min

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通过与GPS广播Klobuchar和原始NeQuick 2模型的比较,我们评估了Galileo广播NeQuick模型的性能。通过将全球定位系统(GPS)观测到的电离层总电子含量(TEC)引入到NeQuick 2模型中,利用IGS全球分布的23个跟踪站计算了Galileo NeQuick模型的广播系数。对2013年大陆和海洋区域三个电离层模型的准确性进行了评价。在大陆区域,来自34个IGS站的电离层TEC被用作比较的参考。在IGS站稀疏的海洋区域,使用JASON-1和2高度计提供的高质量垂直TEC源作为参考。评估结果表明,在大陆地区,GPS广播Klobuchar和原始和广播NeQuick可以减轻电离层延迟分别为56.8%,63.3%和72.4%。在海洋区域,这三种模型分别对电离层延迟的修正率为51.1%、61.2%和68.6%.在测试期间,伽利略广播NeQuick模型在大陆和海洋区域分别优于Klobuchar 15.6%和17.5%。当伽利略开始全面运作时,广播NeQuick模型可以提供准确的电离层误差校正。
We evaluate the performance of Galileo broadcast NeQuick model by comparing it with GPS broadcast Klobuchar and the original NeQuick2 models. The broadcast coefficients of Galileo NeQuick model are computed from 23 globally distributed tracking stations of the International GNSS Service (IGS), by ingesting the Global Positioning System (GPS)-derived ionospheric total electron content (TEC) into the original NeQuick2 model. The accuracy of the three ionospheric models is evaluated over both the continental and oceanic regions for the year 2013. In continental regions, ionospheric TEC derived from 34 IGS stations is used as references for comparison. In oceanic regions, where the IGS stations are sparse, high-quality vertical TEC sources provided by JASON-1&2 altimeters are used as references. The evaluation results show that in continental regions, GPS broadcast Klobuchar and the original and broadcast NeQuick can mitigate the ionospheric delay by 56.8, 63.3 and 72.4 %, respectively. In oceanic regions, the three models can correct for 51.1, 61.2 and 68.6 % of the ionospheric delay. Galileo broadcast NeQuick model outperforms Klobuchar by 15.6 and 17.5 % over the continental and oceanic regions, respectively, for the test period. The broadcast NeQuick model can provide accurate ionospheric error corrections when Galileo begins full operational capability.
DOI: 10.1016/s1364-6826(02)00224-9
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