Abstract：We have detected the anomalies of groundbased GPS TEC data by using Kalman filtering. We made a concrete discussion of approaches for carrying out Kalman filtering, and practically applied it to an analysis of 2dimensional TEC data. Considering SolarTerrestrial environmental factors such as solar activity, magnetic storms and disturbances, we analyzed the TEC anomalies processed with Kalman filtering, discussed the creditability and the exciting mechanism of the anomalies and confirmed that these distinct TEC anomalies occurred on May 9 and 10 were linked to Wenchuan Ms8.0 earthquake impending and would be one of the seismoionospheric precursors. Meanwhile, we proved Kalman filtering practical and effectual in processing of ionospheric TEC anomalies.
