| 引用本文: | 霍星亮,刘琦,刘昊杰.顾及地磁影响的GNSS电离层层析不等像素间距算法.[J].国防科技大学学报,2020,42(6):56-66.[点击复制] |
| HUO Xingliang,LIU Qi,LIU Haojie.GNSS ionospheric tomography with the unequal pixel size considering the geomagnetic effect[J].Journal of National University of Defense Technology,2020,42(6):56-66[点击复制] |
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| 顾及地磁影响的GNSS电离层层析不等像素间距算法 |
| 霍星亮1,刘琦1,2,刘昊杰1,2 |
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(1. 中国科学院精密测量科学与技术创新研究院, 大地测量与地球动力学国家重点实验室, 湖北 武汉 430077;2. 中国科学院大学, 北京 100049)
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| 摘要: |
| 突破传统全球导航卫星系统(Global Navigation Satellite System, GNSS)层析反演研究忽略地球磁场对电离层变化活动的影响,同时顾及不同电离层高度电子密度变化较大的影响,提出在地磁坐标系下建立电离层高度方向上不等像素间距的GNSS层析反演方法。在此基础上,通过建立新的电离层层析迭代松弛因子,提高GNSS电离层电子密度层析反演结果精度。利用IRI—2007电离层模型、GNSS实测数据与电离层测高仪数据,从模拟验证和实测数据对比两方面,反演统计了不同层析算法估算的峰值电离层电子密度误差、电子密度剖面结果平均绝对百分比误差及均方根误差,验证了顾及地磁影响的GNSS电离层层析不等像素间距算法的有效性。 |
| 关键词: 电离层层析 GNSS 电子密度 松弛因子 国际参考电离层模型 |
| DOI：10.11887/j.cn.202006007 |
| 投稿日期：2019-04-23 |
| 基金项目:国家自然科学基金资助项目(41574033,41621091);国家重点研发计划资助项目(2017YFE0131400);转发式试验系统资助项目(ZFS19001D-ZTYJ07,Y9E0151M26) |
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| GNSS ionospheric tomography with the unequal pixel size considering the geomagnetic effect |
| HUO Xingliang1, LIU Qi1,2, LIU Haojie1,2 |
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(1. State Key Laboratory of Geodesy and Earth′s Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430077, China;2. University of Chinese Academy of Sciences, Beijing 100049, China)
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| Abstract: |
| In previous studies, traditional GNSS (global navigation satellite system) ionospheric tomographic methods neglect the influence of geomagnetic field on the ionospheric variations. In this method, a new GNSS tomographic algorithm with the unequal pixel size in the height was proposed to image the ionosphere in the geomagnetic coordinate, which takes into account the influence of electron density variation at different ionospheric heights and the geomagnetic field. Also, a new iterative relaxation factor was established in the proposed GNSS tomographic algorithm to improve the accuracy of the ionospheric electron densities. The performance of GNSS ionospheric tomographic method with unequal pixel size considering geomagnetic effects was evaluated by using the IRI—2007 (international reference ionosphere 2007) model, GNSS measured data, and ionosonde data. For simulation studies, IRI—2007 was used as references, while for GNSS data, the ionosonde data were used as references. The peak ionospheric electron density error, the average absolute percentage error of electron density profile results and the root mean square error were estimated by different GNSS tomographic algorithms. The validity of the tomographic algorithm with the unequal pixel sizes considering the geomagnetic effects is verified. |
| Keywords: ionospheric tomography GNSS electron density relaxation factor international reference ionosphere model |
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