利用非组合精密单点定位提取区域电离层延迟及其精度评定

Regional Ionosphere Delays' Calibration and Accuracy Assessment Based on Uncombined Precise Point Positioning

提出了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。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,2 d内均能保证优于1 dm;单频仿动态PPP的定位精度在平面方向约为4~5 cm,高程方向优于1 dm;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 dm,高程1 m左右。

A new method of regional ionosphere delays＇ calibration based on uncombined precise point positioning（PPP） is proposed in this paper,and the accuracy is assessed by interpolating the calibrated delays at a user station with single frequency simulated kinematic PPP implementation.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.