Comparison and Consistency Research of Regional Ionospheric TEC Models Based on GPS Measurements

TEC information from 2004 all-year GPS measurements on more than 40 continuous-operation stations over China is resolved,these TEC data are modeled by three commonly used regional models: poly model(Poly),trigonometric series model(TRI) and low-degree spheric function model(LSF).The results show that Poly and LSF models are consistent with GIM model(CODE),but the former is degraded by marginal effect,and TRI model have noticeable bias to GIM model,which alarms us this model is not suitable for the region,just for the local.Furthermore,the accuracy on high latitude area is better than that on lower latitude area.