摘要
电离层延迟是影响卫星导航和定位精度的主要误差源之一,精确建立电离层模型对高精度导航定位具有重要意义.针对高纬度区域多全球卫星导航系统(GNSS)电离层建模的研究,首先给出了GNSS多系统的电离层建模方法,然后利用高纬度区域均匀分布的11个MGEX(Multi-GNSS Experiment)测站观测数据进行电离层建模,对比分析了电离层多项式模型和球谐函数模型下GPS单系统和GNSS多系统的电离层建模精度.结果表明:两种电离层模型解算的各系统卫星差分码偏差(DCB)估值差异较小,且绝大部分卫星DCB估值偏差都小于0.5 ns,精度较高;两种电离层模型在GNSS多系统下的系数估计精度高于GPS单系统,且电离层垂直总电子含量(VTEC)残差总体小于GPS单系统;电离层球谐函数模型GPS单系统建模精度为3.09 TECU,GNSS多系统为1.80 TECU,提高率为41.7%.
Ionospheric delay is one of the main error sources that affect the positioning and navigation accuracy.The accurate establishment of ionospheric model is significant for high-precision navigation and positioning.Aiming at the research of multi-GNSS ionospheric modeling in high-latitude region,the multi-GNSS ionospheric modeling method is first given,and then the ionospheric modeling is carried out by using the observation datasets of 11 MGEX stations distributed uniformly in high-latitude region.The modeling accuracy of GPS system and multi-GNSS systems is compared and analyzed under the ionospheric polynomial model and spherical harmonic model.The results show that the difference between the differential code bias(DCB)estimates of each system calculated by the two ionospheric models is small,and the deviation of most of the satellite DCB estimates is less than 0.5 ns.For both two ionospheric models,the coefficient estimation accuracy under multi-GNSS systems is better than that under single GPS system,as well as the VTEC residual is smaller than that under single GPS system.The modeling accuracy of the ionospheric harmonic model is 3.09 TECU for single system and 1.80 TECU for multi-GNSS systems,with an improvement of 41.7%.
作者
肖勇
XIAO Yong(Hangzhou Hanggang Metro Line 5 Co.,Ltd.,Hangzhou 311100,China)
出处
《全球定位系统》
CSCD
2023年第3期33-38,共6页
Gnss World of China
