中国区域VTEC模型Kriging算法研究

发布时间：2018-08-17 08:35

【摘要】：为了对区域电离层延迟进行实时模型化,利用中国区域GPS实测资料,基于球冠谐函数模型、低阶球谐函数模型、多项式模型和Kriging内插方法,构建了电离层延迟模型。重点讨论了电离层垂直总电子含量(vertical total electron content,VTEC)的空间变异性、相关性的统计计算和Kriging内插估计方法,实现了中国区域VTEC格网实时建模。验证结果表明,高纬度地区VTEC拟合精度优于低纬度地区,Kriging内插估计和多项式模型结果的拟合内符合精度明显优于球冠谐函数模型和低阶球谐函数模型。但多项式拟合的格网,其方差则存在明显的边际效应,拟合区域中央精度较高,区域边缘地带精度明显下降;Kriging算法估计的格网点VTEC方差更符合实际情况,穿刺点多的地方,格网点精度较高。
[Abstract]:In order to model the regional ionospheric delay in real time, the ionospheric delay model is constructed based on the spherical crown harmonic function model, the low order spherical harmonic function model, the polynomial model and the Kriging interpolation method, using the measured data of GPS in China. The spatial variability, correlation statistical calculation and Kriging interpolation method of the ionospheric vertical total electron content (vertical total electron) are discussed in detail. The real time modeling of the VTEC grid in China is realized. The results show that the fitting accuracy of VTEC in high latitudes is better than that of Kriging interpolation estimation and polynomial model in low latitudes, which is obviously superior to that of spherical crown harmonic function model and low order spherical harmonic function model. However, the square deviation of polynomial fitting grid has obvious marginal effect, and the precision of the center of fitting area is higher, and the VTEC variance estimated by Kriging algorithm is more in line with the actual situation, where there are more puncture points. Grid dot accuracy is high.
【作者单位】：武汉大学卫星导航定位技术研究中心;日本京都大学;
【基金】：国家自然科学基金重点项目(41231064) 国家高技术研究发展计划(863)(2014AA123101) 中央高校基本科研业务费专项资金(2042016kf0061)~~
【分类号】：P228.4

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