| 武汉大学IGS电离层分析中心全球电离层产品精度评估与分析 |
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| 引用本文： | 张强,赵齐乐.武汉大学IGS电离层分析中心全球电离层产品精度评估与分析[J].地球物理学报,2019,62(12):4493-4505. |
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| 作者姓名： | 张强 赵齐乐 |
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| 作者单位： | 1. 武汉大学卫星导航定位技术研究中心, 武汉 430079;2. 地球空间信息科技协同创新中心, 武汉 430079 |
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| 基金项目： | 国家自然科学基金（41574030，41774035），中国博士后科学基金资助项目（2019M662715）. |
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| 摘 要： | 2016年2月,武汉大学卫星导航定位技术研究中心(Wuhan University, WHU)正式成为新的国际GNSS服务组织(International GNSS Services, IGS)电离层联合分析中心(Ionosphere Associate Analysis Center, IAAC).本文首次系统地评估和分析了武汉大学IGS电离层分析中心自2016年日常化运行以来(2016年1月到2018年9月,太阳活动低年)的全球电离层产品的精度,并与其他六家IAACs (CODE、JPL、ESA、UPC、EMR和CAS)进行了比较分析.结果表明:WHU的全球电离层产品能够长期稳定且有效地监测全球电离层总电子含量(Total Electron Content, TEC)的时空变化;和IGS综合全球电离层产品比较,WHU的模型均方根误差和CODE、JPL相差不大,均值约为1.4 TECU,产品一致性优于其他IAACs;和GPS实测电离层TEC比较,WHU的模型内符合精度和CODE基本相当,均值约为1.4 TECU,且与电离层活动水平和地理纬度存在显著的相关性;和Jason-2测高卫星VTEC比较,WHU的全球电离层产品的系统性偏差均值约为-0.7 TECU,在不同纬度约为-3.0到1.0 TECU,且与地理纬度存在近似抛物线函数的关系;WHU的模型外符合精度和CODE、JPL以及CAS基本一致,均值约为2.9 TECU,且在中高纬度地区优于低纬度地区,北半球优于南半球.
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| 关 键 词： | 全球导航卫星系统 电离层 电离层分析中心 全球电离层模型 总电子含量 |
| 收稿时间： | 2019-01-08 |
Evaluation and analysis of the global ionosphere maps from Wuhan University IGS Ionosphere Associate Analysis Center |
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| ZHANG Qiang,ZHAO QiLe.Evaluation and analysis of the global ionosphere maps from Wuhan University IGS Ionosphere Associate Analysis Center[J].Chinese Journal of Geophysics,2019,62(12):4493-4505. |
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| Authors: | ZHANG Qiang ZHAO QiLe |
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| Institution: | 1. GNSS Research Center, Wuhan University, Wuhan 430079, China;2. Collaborative Innovation Center of Earth and Space Science, Wuhan 430079, China |
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| Abstract: | The GNSS Research Center of Wuhan University (WHU) was recognized as a new International GNSS Services (IGS) Ionosphere Associate Analysis Center (IAAC) in February 2016. We evaluated and analyzed the Global Ionosphere Maps (GIMs) that were operationally generated at the WHU IAAC since 2016 comprehensively for the first time. The GIMs during the period from January 2016 to September 2018 which belonged to low solar activity periods were assessed and compared with the other six IAACs (CODE, JPL, ESA, UPC, EMR, and CAS). The results showed that the GIMs from WHU IAAC could monitor the variations of the global ionospheric total electron content (TEC) effectively and stably in a long term. When compared with the IGS combined GIM, the differences of root mean square (RMS) between WHU, CODE and JPL were small, and the consistencies were better than other IAACs with a mean value of about 1.4 TECU (TEC Unit). The internal precision was computed by comparing the WHU GIMs with the ionospheric TEC that was derived from the GPS observations distributed globally. The precision of WHU was about 1.4 TECU and was at the same level as that of CODE. Further investigation showed that this value had a strong relation with the ionospheric activities and the geographic latitudes. At last, WHU GIMs were also assessed by the Jason-2 altimetry satellite. There existed a systematic bias between the WHU GIM and the Jason-2 vertical TEC with a mean value of about -0.7 TECU, but it varied from -3.0 to 1.0 TECU at different latitudes showing an approximate function of parabola. The external accuracy of WHU was similar to that of CODE, JPL and CAS with a mean value of 2.9 TECU. It was also found that the accuracy in the middle and high latitudes was better than that in the low latitudes, and was better in the Northern Hemisphere than that in the Southern Hemisphere. |
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| Keywords: | Global navigation satellite system Ionosphere Ionosphere associate analysis center Global ionosphere map Total electron content |
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