重力关键比对点连续观测不确定度评估

Accuracy Evaluation of Gravity Continuous Observation at Key Comparison Site of Absolute Gravimeter

分析了超导重力仪iGrav-012在中国计量科学研究院全球绝对重力仪关键比对参考点连续观测结果的不确定度,通过最小二乘加权拟合计算超导重力仪格值因子为-927.96(nm/s 2)/V,标准不确定度为0.80(nm/s 2)/V,格值因子对关键比对点连续观测引入的标准不确定度为3.20 nm/s 2,超导重力仪与绝对重力仪5.5年同址观测线性拟合得到超导重力仪漂移率为-14.66(nm/s 2)/年,标准不确定度为2.1(nm/s 2)/年,对关键比对点连续观测引入的标准不确定度为6.30 nm/s 2,二者对重力连续观测结果引入标准不确定度为7.07 nm/s 2。

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/s 2)/V,and the uncertainty is 0.80(nm/s 2)/V.The uncertainty of continuous observation results of superconduct gravimeter introduced by the calibration factor is 3.20 nm/s 2.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/s 2)/year,and the uncertainty is 2.1(nm/s 2)/year.The uncertainty of continuous observation results of superconduct gravimeter introduced by the drift is 6.30 nm/s 2,and the uncertainty introduced by the two variables to the continuous gravity observation results is 7.07 nm/s 2.