Abstract The uncertainty of continuous observation results of superconduct gravimeter iGrav-012 at the comparison point of the global absolute gravimeter of National Insitute of Metrology is analyzed. The calibration factor of superconduct gravimeter is -927.96(nm/s2)/V, and the uncertainty is 0.80(nm/s2)/V. The uncertainty of continuous observation results of superconduct gravimeter introduced by the calibration factor is 3.20 nm/s2. After 5.5 years′ observation at the same site of superconduct gravimeter and absolute gravimeter, the drift rate of superconduct gravimeter is -14.66(nm/s2)/year, and the uncertainty is 2.1(nm/s2)/year. The uncertainty of continuous observation results of superconduct gravimeter introduced by the drift is 6.30nm/s2, and the uncertainty introduced by the two variables to the continuous gravity observation results is 7.07nm/s2.
MOU Li-shuang,FENF Jin-yang,WU Shu-qing, et al. Accuracy Evaluation of Gravity Continuous Observation at Key Comparison Site of Absolute Gravimeter[J]. Acta Metrologica Sinica, 2022, 43(12): 1639-1644.
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