【作者】 李玮； 程鹏飞； 秘金钟；

【Author】 Li Wei 1,2,Cheng Pengfei 2,Bei Jinzhong 2 1 School of Geodesy and Geomatics,Wuhan University,Wuhan,430079 2 Chinese Academic of Surveying and Mapping,Beijing,100830;

【机构】 武汉大学测绘学院； 中国测绘科学研究院；

【摘要】 本文提出一种利用非组合精密单点定位(PPP)提取区域电离层延迟的方法,并将区域电离层延迟内插至用户站实施单频仿动态PPP,以检验电离层延迟的提取精度。选取华北某省CORS系统四个间距约为70-100公里的参考站两天的观测数据(分别对应电离层平静和扰动时期),将提取得到的电离层延迟逐卫星、逐历元内插至仿用户站(距离参考站约50-60公里),改正单频观测值的电离层延迟以实施单频仿动态PPP实验。结果表明,电离层延迟内插精度受电离层活动变化影响较小,两天内均能保证优于1分米;单频仿动态PPP的定位精度在平面方向约为4～5厘米,高程方向优于1分米;为便于比较分析,在仿用户站分别采用半和改正模型和全球电离层格网模型实施单频仿动态PPP,其定位精度分别为平面4-7分米,高程1米左右。表明利用非组合PPP提取区域电离层延迟精度远优于上述两种模型,可显著提高单频PPP的收敛速度和定位精度。更多还原

【Abstract】 A new method of regional ionosphere delays’ calibration based on uncombined precise point positioning(PPP) is proposed in this study,and the accuracy is assessed by interpolating the calibrated delays at a user station with single frequency simulated kinematic PPP implementation.Two days’ data set of four reference stations(with an inter-station distance of about 70-100 km) from a provincial CORS in northern China are adopted,which are in the ionosphere calm and disturbed condition respectively.The single-frequency observables from a simulated user station(with an inter-station distance to reference stations of about 50-60 km) are corrected by the interpolated ionosphere delays satellite-by-satellite and epoch-by-epoch,and positioning solutions are adopted in single frequency simulated kinematic PPP mode. The results show that the accuracy of interpolation is better than 1 dm and less affected by the ionosphere activity;the positioning accuracy of single frequency simulated kinematic PPP are 4～5 cm for panel and better than 1 dm for vertical respectively.Comparatively,two reference solutions are also obtained in single frequency simulated kinematic PPP mode,with eliminating ionosphere delays either by forming semi-combination observations or interpolated values from Global Ionosphere Maps(GIM),the positioning accuracy of both cases are approximately 4～7 dm and 1 m for the panel and vertical respectively.The results demonstrate a better performance of the PPP-based regional ionosphere calibration than above-mentioned cases,the convergence behavior and the accuracy can be improved remarkably in single frequency kinematic PPP.更多还原