Abstract：Using the RMS of the difference between the observed data and the DDW tidal model and the gravity residuals as constraints, we improve the calibration method of gPhone gravimeter scale factor based on M2 wave. Using the improved method, we calibrate 9 gPhone gravimeters in the continuous gravity network. We evaluate the accuracy of the calibration results based on the relative error of M2 tidal wave and the RMS of the residual amplitude spectrum, and compare them with the FG5 comparison method and the M2 tidal wave calibration method. The results show that the average relative error between the M2 tidal wave tidal factor and the theoretical solid tide model is improved to 0.215 2%, and the RMS of the residual amplitude spectrum reaches 1.690 2 μGal under the improved method of this paper, which is comparable to the accuracy of the FG5 comparison method and better than the M2 tidal wave calibration method. At last, we discuss the distribution regularity of the scale factor and the longitude dependence of the gravity residual vector on the location of the station.
ZHAO Yabo,HU Minzhang,WEI Jin et al. Improvement of Calibration Method of gPhone Gravimeter Scale Factor with Tidal Model as Constraint[J]. jgg, 2023, 43(8): 826-831.
