| 引用本文: | 罗佳,王涵,徐晓华.2014—2016年FY-3C与COSMIC掩星电离层特征参数的比较.[J].国防科技大学学报,2018,40(4):181-186.[点击复制] |
| LUO Jia,WANG Han,XU Xiaohua.Comparison of ionospheric characteristic parameters retrieved from FY-3C and COSMIC radio occultation during 2014 to 2016[J].Journal of National University of Defense Technology,2018,40(4):181-186[点击复制] |
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| 2014—2016年FY-3C与COSMIC掩星电离层特征参数的比较 |
| 罗佳1,2, 王涵1, 徐晓华1,3 |
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(1. 武汉大学 测绘学院， 湖北 武汉 430079;2.
2. 地球空间环境与大地测量教育部重点实验室， 湖北 武汉 430079;3.
3. 地球空间信息技术协同创新中心， 湖北 武汉 430079)
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| 摘要: |
| 利用由FY-3C和COSMIC两个全球导航卫星系统无线电掩星任务提供的2014—2016共3年的电离层电子密度廓线，基于时间间隔7.5 min、经纬度间隔2.5°的时空匹配窗口，对两个掩星任务的电离层峰值密度（NmF2）和峰值高度（hmF2）进行了比较。结果表明：由两个任务得到的特征参数相关性良好，各年之间相关性水平基本稳定，其中各年NmF2和hmF2相关系数的平均值分别为0.87和0.75；FY-3C的特征参数相对于COSMIC的偏差很小，各年NmF2的绝对偏差均值和相对偏差均值分别不超过±0.25×105 el/cm3和±15.0%，hmF2的绝对偏差均值和相对偏差均值分别不超过±7.00 km和±1.80%。此外，由两个任务得到的特征参数在空间上均表现出赤道及低纬地区数值较高且呈“条带状”分布的特点，且两个任务都监测到了2016年相对于2014年和2015年NmF2和 hmF2均存在显著下降的现象 |
| 关键词: 风云3C COSMIC 电离层特征参数 相关系数 偏差 |
| DOI：10.11887/j.cn.201804027 |
| 投稿日期：2018-03-25 |
| 基金项目:国家自然科学基金资助项目（41774032，41774033） |
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| Comparison of ionospheric characteristic parameters retrieved from FY-3C and COSMIC radio occultation during 2014 to 2016 |
| LUO Jia1,2, WANG Han1, XU Xiaohua1,3 |
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(1. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China;2.
2. Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan 430079, China;3.
3. Collaborative Innovation Center for Geospatial Technology, Wuhan 430079, China)
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| Abstract: |
| The ionospheric EDPs (electron density profiles) obtained during 2014 to 2016 from two GNSS(global navigation satellite system) RO (radio occultation) missions, the FY-3C mission and the COSMIC mission, were used to compare the ionospheric peak density NmF2 and the ionospheric peak height hmF2 of two missions under the collocation criterion with the time window of 7.5 min and the space window of 2.5°. The results show that the peak parameters derived from the two RO missions are highly correlated, with the yearly average correlation coefficient of NmF2 and hmF2 being 0.87 and 0.75, respectively. The biases of the peak parameters derived from the two RO missions are very small, with the absolute and the relative bias of NmF2 and hmF2 being less than ±0.25×105 el/cm3and ±15.0%, and ±7.00 km and ±1.80%, respectively. In addition, the strip shaped spatial distributions of the two ionospheric characteristic parameters from both of the two RO missions show that the values of NmF2 and hmF2 are larger in the areas of the equator and low latitudes than in other regions, and that the values of NmF2 and hmF2 decline significantly in 2016 compared with 2014 and 2015. |
| Keywords: FY-3C COSMIC ionospheric characteristic parameters correlation coefficient bias |
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