【作者】 王俊杰； 何秀凤；

【Author】 Junjie WANG · Xiufeng HE Institute of Satellite Navigation & Spatical Information System, Hohai University, 210098 Nanjing, China

【机构】 河海大学卫星及空间信息应用研究所；

【摘要】 北斗卫星导航系统(Beidou Navigation Satellite System,BDS)等全球卫星导航系统(Global Navigation System,GNSS)的导航定位精度深受电离层延迟的影响。北斗卫星导航系统和全球定位系统(Global Position System,GPS)均向用户发布 Klobuchar 模型进行电离层延迟改正,但二者的参考框架并不相同,通过比较发现在中国区域内 BDS 的 Klobuchar模型具有更好的改正效果。基于北斗的地面增强网的建设,为建立多模卫星导航系统区域电离层模型提供了可能。本文采用实测多模 GNSS 数据建立 BDS/GPS 多项式 VTEC 模型,通过单点定位方式对模型的改正精度进行评价。研究结果表明:多项式 VTEC 模型对于电离层延迟误差的改正效果较好,可显著提高单频用户的定位精度。更多还原

【Abstract】 The same as other Global Navigation Satellite System (GNSS), Beidou Navigation Satellite System (BDS) suffers the influence of ionospheric dalay. BDS and GPS both provide the Klobuchar correction model for ionospheric dalay. But the GPS model is based on the geomagnetic reference frame while the BDS model is based on the geography reference frame. By comparison, it is shown that the BDS model has a better performance in China. The construction of the ground-based augmentation network based on BDS makes it possible to build a regional ionospheric model using multi-GNSS observation. The BDS/GPS polynomial VTEC model is built using real data, and the evaluation is done by comparing and analyzing the precision of single point positioning (SPP) with different ionospheric models. The final result indicates that the polynomial VTEC model can significantly improve the accuracy of positioning for single-frequency user.更多还原