A New Mapping Function for Spaceborne TEC Conversion Based on the Plasmaspheric Scale Height
A New Mapping Function for Spaceborne TEC Conversion Based on the Plasmaspheric Scale Height
复制标题
基于等离子体层高度的星载TEC转换新映射函数
DOI：
10.3390/rs13234758
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发表时间：
2021
期刊：
影响因子：
5
通讯作者：
Hu Xiaogong
中科院分区：
文献类型：
--
作者：
Wu Mengjie;Guo Peng;Zhou Wei;Xue Junchen;Han Xingyuan;Meng Yansong;Hu Xiaogong
映射函数对于低地球轨道（LEO）卫星观测将倾斜总电子含量（TEC）转换为垂直TEC至关重要。而不是崩溃的电离层成一个单一的壳在常用的映射模型，我们定义了一个新的映射函数，假设垂直电离层分布作为一个指数剖面仪与一个简单的参数：在天顶方向的LEO卫星的等离子体层尺度高度。通过经验模型获得的尺度高度将空间和时间方差引入映射函数。通过基于全球核心等离子体模型（GCPM）的模拟实验，将新方法的性能与映射函数F&K进行了比较，并讨论了它随纬度、季节、当地时间、太阳活动条件以及低轨轨道高度变化的沿着变化。评估表明，新的映射函数具有相当或更好的性能比F&K映射模型，特别是在低仰角的TEC转换。
The mapping function is crucial for the conversion of slant total electron content (TEC) to vertical TEC for low Earth orbit (LEO) satellite-based observations. Instead of collapsing the ionosphere into one single shell in commonly used mapping models, we defined a new mapping function assuming the vertical ionospheric distribution as an exponential profiler with one simple parameter: the plasmaspheric scale height in the zenith direction of LEO satellites. The scale height obtained by an empirical model introduces spatial and temporal variances into the mapping function. The performance of the new method is compared with the mapping function F&K by simulating experiments based on the global core plasma model (GCPM), and it is discussed along with the latitude, seasons, local time, as well as solar activity conditions and varying LEO orbit altitudes. The assessment indicates that the new mapping function has a comparable or better performance than the F&K mapping model, especially on the TEC conversion of low elevation angles.