摘要
反距离加权内插法是一种普遍使用的电离层总电子含量(total electron content,TEC)内插方法,但其受站间距影响较大,大范围内插值所需站点数量较多。针对同经向分布下的站点,利用电离层在同经度分布下具有从高纬度到低纬度递减的特征,对电离层TEC进行经向多项式拟合并内插。经统计,插值偏差的均方根(root mean square,RMS)在3 TECU以内,满足定位过程中对电离层延迟估计的要求,同时该方法扩大了站间距,实现了大范围内实时TEC内插。
The inverse distance weighted interpolation method is widely used in ionospheric total electron content(TEC)interpolation,but it is greatly affected by the distance between stations,and the number of stations required for interpolation over a large range is large.The ionosphere has a characteristic of decreasing from high latitude to low latitude under the same meridional distribution.For the stations under the same meridional distribution,we establish a polynomial to fit and interpolate the ionospheric TEC.According to the statistical results,the root mean square(RMS)of interpolation bias is within 3TECU,which satisfies the requirements of ionospheric delay estimation during the positioning.At the same time,this method expands the station spacing and enables real-time TEC interpolation in a wide range.
作者
陈远
刘佳
黄林超
周永江
许超钤
刘虎
CHEN Yuan;LIU Jia;HUANG Linchao;ZHOU Yongjiang;XU Chaoqian;LIU Hu(Digital Grid Research Institute,China Southern Power Grid,Guangzhou 510700,China;School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China;Shandong Institute of Land Surveying and Mapping,Ji’nan 250013,China)
出处
《测绘地理信息》
CSCD
2022年第5期22-25,共4页
Journal of Geomatics
基金
国家自然科学基金(41274022)
