In order to avoid over parameterization of accelerometer calibration, the scale and deviation of the accelerometer were calibrated monthly and daily, Comprehensive considering the observation errors of orbit, inter-satellite range rate, attitude and accelerometer data to modify short arc method. Based on the modified short arc method, the 180 degree and order Tongji-Grace02s unconstrained static gravity field model is obtained by solving the GRACE satellite data (including accelerometer data, attitude data and inter-satellite range rate data) and geometric orbit data from January 2003 to July 2016, and further regularization constraint processing is performed on the high degree and order coefficients to obtain Tongji-Grace02k model.

Corresponing author：Professor Qiujie Chen (qiujiechen@tongji.edu.cn)

The Tongji-Grace02s solutions can be directly downloaded from the website of

https://workdrive.zohopublic.com.cn/external/1fdcb08e58115c4755a10de21d17b42836eda1282bce0a113b0e11a5037b734b.

The Tongji-Grace02k solutions can be directly downloaded from the website of

https://workdrive.zohopublic.com.cn/external/b54e08a9a994d95adf57e12c97cfc1804b3eb003cb7d52acec8594ffa42b824a.

When using this data, please cite the following publications which provide details about the approach and the models used.

Chen Q, Shen Y, Francis O, Chen W, Zhang X, Hsu H.(2018). Tongji-Grace02s and Tongji-Grace02k: high-precision static GRACE-only global Earth's gravity field models derived by refined data processing strategies. Journal of Geophysical Research: Solid Earth,123(7): 6111-6137.

Chen Q, Shen Y, Chen W, Zhang X, Hsu H, (2016). An improved GRACE monthly gravity field solution by modelling the non-conservative acceleration and attitude observation errors. Journal of Geodesy, 90(6),503-523.

Chen Q, Shen Y, Zhang X, Hsu H, Chen W, Ju X, Lou L, (2015). Monthly gravity field models derived from GRACE Level 1B data using a modified short-arc approach. Journal of Geophysical Research: Solid Earth, 120(3), 1804-1819.