Abstract:In this paper, we carefully analyze the static and dynamic drift characteristics of four CG-5 gravimeters. We find that the static drift of CG-5 gravimeters increases linearly in one static test result. When we divide different time scales, there are still some differences in instrument drift rate in each time period. At the same time, the static drift rate varies over long periods of time. The drift rate of CG-5 gravimeters varies greatly with different measuring times. The drift rate of CG-5 gravimeters vary greatly when initially put into use, gradually decreases with time, and the final drift rate varies in a certain range. The dynamic drift rate of the four instruments is not closely related to the instrument space. The drift characteristics of each instrument show a relatively consistent trend in the long-term variation of static drift rate, in the dynamic test of uphill and downhill, and in the dynamic drift rate change process of each line in a single period. Based on the above, this paper uses the method of time-division adjustment to correct the drift of observation data. After drift correction, the data quality of each instrument and the whole system is improved.
LIANG Xiao,XU Rugang,LIN Chenghao et al. Drift Characteristics of CG-5 Gravimeter and the Method of Time-Division Adjustment[J]. jgg, 2020, 40(6): 655-660.