电离层层析VTEC投影函数模型

A VTEC Projection Function Based on Ionospheric Tomography

目前通用的电离层投影函数在电离层垂直总电子含量(VTEC)向倾斜总电子含量(STEC)转换的过程中仅考虑高度角的影响,未考虑方位角的影响。针对此问题提出了一种基于电离层层析技术的新模型。该模型通过分析电离层电子密度分布的特点,对电子密度进行合理分层;并利用各层电子含量所占总电子含量比例确定权值。通过对穿刺射线的STEC进行分段计算,并对每段电子含量与对应权的乘积求和来确定最终的STEC值。最后,将新方法和传统方法得到的STEC值分别与"STEC真值"进行比较,验证了新算法的精度和可靠性。

At present,the influence of altitude angle in the conversion from VTEC to STEC is only considered in the general ionospheric projection function,but the effect of azimuth angle is not considered. To solve this problem,a new model based on the ionospheric tomography is proposed in this paper. By analyzing the characteristics of ionospheric electron density distribution,the electron density is reasonably divided into layers in this model.And the proportion of the total electron content of each layer is used to determine the weight. By piecewise calculating of the STEC of the puncture ray and summing the product of electronic content of each section and corresponding weight,the final value of STEC is determined. Finally,the STEC values obtained by the new method and the traditional method are compared with the true value,and the accuracy and reliability of the algorithm are verified.