格网电离层模型在单频精密单点定位中的应用

Application of Grid Ionospheric Model in Single-Frequency Precise Point Positioning

基于四点内插方法建立了选点内插模型,讨论了内插过程中的两种定权方法;利用4个IGS跟踪站连续3d的实测数据,采用单频精密单点定位方法,以坐标外符合误差为标准比较分析了两种内插模型和两种定权方法的效果。实验结果表明:两种内插模型和两种定权方法都是有效的,应用于单频精密单点定位时能够使点坐标外符合精度达到厘米级。最后,针对单频精密单点定位中电离层延迟误差的处理问题提出了具有参考性的建议。

Based on four-points interpolation model, selected-points interpolation model was presented. Two methods to confirm weight were analyzed. The consecutive three days＇ observation datum of four IGS tracing stations were used in the single-frequency precise point positioning （SPPP） experiment in which the external accord error was used as criterion to judge the effect of the two interpolation models and the two confirming- weight methods. The results showed that the two interpolation models and the two confirming-weight methods both were effective in SPPP, which made the coordination external accord accuracy come to centimeter level. At last, some suggestions were presented about how to deal with ionospheric delay in SPPP.