摘要
计算位于不同纬度的3个MGEX测站在不同太阳活动及地磁场活动情况下GPS、GLONASS、Beidou和Galileo卫星导航定位系统的电离层高阶项(HOI)延迟,分析高阶项延迟对多系统PPP结果的影响,总结不同太阳活动和地磁活动对PPP的影响。结果表明,电离层延迟随纬度的增加而减小;太阳活动是影响电离层高阶项延迟的主要因素,在太阳活动指数较低时,二阶项延迟不超过2 cm,三阶项延迟约为1 mm;当太阳指数较高时,二阶项延迟超过2.5 cm,三阶项延迟可达到5 mm;当磁暴发生时,高阶项延迟会存在一定程度的增长。将电离层高阶项延迟改正后,太阳活动指数较低时点位精度提升效果明显。
The higher-order ionospheric(HOI)delays for GPS,GLONASS,Beidou and Galileo in three MGEX stations at different latitudes in different solar and geomagnetic conditions are calculated.Moreover,effects of HOI on multi-GNSS precise point positioning(PPP)are studied and the impact of different solar and geomagnetic activity on the accuracy of PPP is demonstrated.The results show that higher-order ionospheric delay decreases with increasing latitude.Solar activity is the main factor to affect the higher-order ionospheric delays.The second-order ionospheric delay is less than 2 cm and the third-order ionospheric delay is about 1 mm at low solar activity.The second-order ionospheric delay is more than 2.5 cm and the third-order ionospheric delay reaches 5 mm at high solar activity.When a geomagnetic storm occurs,the delay has a certain degree of growth.After correcting the higher-order ionosphere delay,the improvement effect of positioning accuracy is better at lower solar activity than at higher solar activity.
作者
谢名强
徐佳佳
周厚香
李淑慧
徐泽远
王子钦
XIE Mingqiang;XU Jiajia;ZHOU Houxiang;LI Shuhui;XU Zeyuan;WANG Ziqin(School of Land Science and Technology,China University of Geosciences,29 Xueyuan Road,Beijing 100083,China)
出处
《大地测量与地球动力学》
CSCD
北大核心
2020年第7期751-755,共5页
Journal of Geodesy and Geodynamics
基金
国家自然科学基金(41574011)。
