Evaluating the coincidence accuracy and time-varying characteristics of global total electron content (TEC) grid data can contribute to the improvement of the performance of global ionosphere maps (GIMs) and provide effective data support and theoretical verification for GIMs model update. This paper applies the global TEC grid data and GPS single-station ionospheric TEC data published by IGS from 1999 to 2020, as well as the F10.7 and SSN data series provided by the World Sunspot Index Data Center in Belgium. Using correlation, time series, and contour chart analyses, the correlation between TEC RMS and F10.7, SSN, and the accuracy-compliant space–time variation characteristics in the global TEC grid data are studied and analyzed. The results show the accuracy of the global TEC grid data is highly correlated with the solar activity intensity. The mean values of the correlation coefficients R between TEC RMS and F10.7, SSN are 0.755 and 0.707, respectively. The internal coincidence accuracy of single station GPS-TEC and global grid TEC is better than 3 TECU and is closely related to the solar activity. Globally, TEC RMS in land and ocean areas have significant differences. In general, the accuracy of the northern hemisphere is significantly higher than that of the southern hemisphere, and the accuracy of land is higher than that of the ocean. Among them, the accuracy of Europe and North America is the highest, the precision of the Pacific region is obviously on the low side, and “double hump” phenomenon can be observed. The accuracy of the global TEC grid data is closely related to the number of stations and satellites. The accuracy of the TEC grid data is higher in areas where the number of stations is dense, or when there are more satellites.

评估全球总电子含量（TEC）网格数据的符合精度和时变特性，有助于提高全球电离层图（GIMs）的性能，为GIMs模型更新提供有效的数据支持和理论验证。本文应用了IGS 1999-2020年发布的全球TEC网格数据和GPS单站电离层TEC数据，以及比利时世界太阳黑子指数数据中心提供的F10.7和SSN系列数据。利用相关性、时间序列和等高线图分析，研究和分析了TEC RMS与F10.7、SSN之间的相关性以及全球TEC网格数据中符合精度的时空变化特征。结果表明，全球TEC网格数据的准确性与太阳活动强度高度相关。TEC RMS 与 F10.7、SSN 之间的相关系数 R 的平均值分别为 0.755 和 0.707。单站GPS-TEC和全球网格TEC的内部重合精度优于3 TECU，与太阳活动密切相关。在全球范围内，陆地和海洋区域的 TEC RMS 存在显着差异。一般来说，北半球的精度明显高于南半球，陆地的精度高于海洋。其中，欧洲和北美的精度最高，太平洋地区的精度明显偏低，可以观察到“双峰”现象。全球TEC网格数据的准确性与台站和卫星的数量密切相关。