CG-5重力仪格值系数对重力数据处理的影响

以南天山重力测网内的3个绝对重力点作为平差基准，利用2015~2016年的流动重力观测资料对两台CG-5重力仪进行实测标定，并对实测标定前后的重力网平差结果进行比较。结果显示，实测标定的格值系数与基线场的标定结果差异较大，利用实测标定值得到的平差精度明显高于标定前，利用带有误差的格值系数进行平差计算会引入额外的系统误差；差分重力变化结果显示，标定后的重力变化量级明显减小。由此表明，利用测网实测数据标定重力仪的格值系数可以有效减弱格值系数误差对平差结果的影响，有利于消除重力场变化结果的虚假信息。

Impact on Gravity Data Process of Scale Factor Coefficient of CG-5 Gravimeter

Three absolute gravimetric points in southern Tianshan gravity network are used as adjustment data, and repeated gravity data sets of 2015-2016 are used to calibrate two CG-5 gravimeters. Then, the adjustment results before and after calibration are compared. The results show that the scale factor coefficient after calibration is significantly different than the initial value. The adjustment precision obtained by the calibration value is obviously higher than that using the initial value. Additional systematic errors are introduced by using the scale factor with error. Differentiated gravity change results show that gravity change obtained by the calibration value reduced significantly. The analysis shows that using observation data from the gravity network to calibrate the scale factor of gravimeters can reduce the influence of scale factor with error on the adjustment result effectively. It is therefore useful to eliminate the false information on gravity change.