GPS与格洛纳斯电离层电子总含量建模的差异性分析及改进
Difference Analysis and Improvement of Ionospheric TEC Modeling of GPS and GLONASS
投稿时间:2017-11-14  修订日期:2019-02-25
DOI:10.11908/j.issn.0253-374x.2019.04.016     稿件编号:    中图分类号:P208
 
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中文摘要
      为了提高多模GNSS(global navigation satellite system)电离层电子总含量(TEC)的计算精度,基于全球及中国区域研究了GPS(global positioning system)TEC和GLONASS(global orbiting navigation satellite system)TEC的差异及变化规律.GPS TEC精度要优于GLONASS TEC,两者相关性随纬度降低而降低,并且GLONASS TEC较之GPS TEC存在一定程度的低估;TEC精度差异与星座配置、信号体制及轨道周期差异有关,并受到本地时影响,F2层临界频率(foF2)存在类似情况.基于GPS TEC和GLONASS TEC的差异性,对组合建模时伪距观测权函数进行改进,平均偏差约改进20%,内符精度约改进15%.
英文摘要
      To improve the total electron content (TEC) accuracy retrieved by multi mode GNSS(global navigation satellite system), this paper addresses the distinctions of TEC retrieved from GPS(global positioning system) and GLONASS(global orbiting navigation satellite system) using global and Chinese GNSS stations. It indicates that TEC retrieved from GPS is more accurate than that from GLONASS. The regional model results in China show that the GPS/GLONASS TEC correlation coefficients increase with latitude and GLONASS underestimates TEC compared with GPS. The difference has the relationship with constellation configuration, signal system and orbit design difference. The TEC difference has latitude and local time dependency, and critical frequency of F2 layer (foF2) has similar phenomena with local time and geographic latitude dependency. Based on the study, a newly weighting function is designed for GLONASS measurements. The results show that the method will improve the bias and the root mean square (RMS) by 15% and 20% respectively in GPS and GLONASS combine mode.
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