基于全球卫星导航系统观测网的全球总电子含量快速反演方法

发布时间：2018-04-16 23:03

本文选题：全球定位系统 + 总电子含量　；参考：《上海交通大学学报》2017年02期

【摘要】：将全球按照地理经纬度进行网格划分,每网格选取一个接收机,基于全球卫星导航系统(GNSS)观测网的全球定位系统(GPS)双频观测数据,在电离层薄层假设条件下,提出了一种基于球谐函数拟合的高时间分辨率总电子含量(TEC)快速反演方法.利用2006年四季中16个地磁平静日的GPS双频观测数据,针对15种不同的网格选站情况考察其TEC的反演效果与解算时间.结果表明,当网格选站间隔小于15°×30°(纬度×经度)时,数据拟合度约为2TECU,并都能较好地反演TEC.综合考虑穿刺点分布与解算时间,在10°×20°(纬度×经度)选站条件下,约在3min内即可反演出有效的TEC、卫星硬件偏差和接收机硬件偏差,从而提高了反演速度,10°×20°(纬度×经度)选站的快速反演TEC能够为全球电离层TEC现报提供一种有效方法.
[Abstract]:The global grid is divided according to the geographical longitude and latitude, one receiver is selected for each grid, and the GPS dual-frequency observation data based on the GNSS observation network are selected. Under the assumption of the ionospheric thin layer,A fast inversion method of high time resolution total electron content (TECs) based on spherical harmonic function fitting is proposed.Based on the GPS dual-frequency observation data of 16 geomagnetic quiet days in the four seasons of 2006, the inversion effect and solution time of TEC are investigated for 15 different grid stations.The results show that when the grid selection interval is less than 15 掳脳 30 掳(latitude 脳 longitude), the data fit is about 2TECU, and the TECs can be retrieved well.Considering the distribution and solution time of puncture point, the effective TECs, satellite hardware deviations and receiver hardware deviations can be obtained in 3min under the condition of 10 掳脳 20 掳(latitude 脳 longitude) station selection.Thus, the fast inversion of TEC with 10 掳脳 20 掳(latitude 脳 longitude) station selection can provide an effective method for global ionospheric TEC reporting.
【作者单位】：中国科学院国家天文台;中国科学院大学;
【基金】：国家自然科学基金资助项目(11473045,11403045,11503040)
【分类号】：P228.4;P352.7

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