GPS单频PPP电离层延迟改正模型探讨

针对电离层延迟会导致GPS单频精密单点定位精度严重缺失的情况,分别探讨了克罗布歇模型、格网模型和历元差分模型,并采用IGS跟踪站数据进行电离层延迟改正。同时根据改正后的单频精密单点定位精度,比较了这三种电离层延迟改正模型的改正效果。结果表明:历元差分模型的改正效果最好,其改正后单频精密单点定位精度可达到厘米级,能较好地符合实际应用要求。

Discussion on GPS Single Frequency PPP Ionosphere Delay Correction Model

For ionosphere delay would cause GPS single frequency precise point positioning(referred to as PPP)serious lack of accuracy,Klobuchar model,grid(GIM)model and epoch difference(SEID)model were discussed,and ionosphere delay correction was done using IGS tracking station data.At the same time,ac-cording to the corrected PPP precision,the correction effects of these three ionosphere delay correction models were compared.The results showed that the correction effect of the SEID model was the best,the PPP accuracy of which can reach centimeter level and can better meet the actual application requirements.