零漂改正对中国地壳运动观测网络重力数据处理的影响
发布时间：2018-10-23 11:13
【摘要】：基于中国地壳运动观测网络2000年流动重力观测数据,分析18台LCR-G型相对重力仪的零漂特性。结果显示,重力仪零漂率在某些时段变化较大,最大达10μGal/h以上。根据重力仪零漂改正的不同处理方法,利用传统平差模型与改进模型对观测数据进行平差计算,并对结果进行比较。在相同先验中误差的情况下,传统平差模型的后验中误差为39μGal,重力值平均精度为26.5μGal,而改进模型的后验中误差为16.5μGal,重力值平均精度为11.2μGal,远高于传统平差模型。在数据预处理阶段按闭合观测分段进行零漂改正,可以有效消除重力仪零漂剧烈变化的影响,明显优于将仪器零漂率当作固定参数的计算方法。
[Abstract]:Based on the mobile gravity observation data of China crustal Movement observation Network in 2000, the zero drift characteristics of 18 LCR-G relative gravimeters are analyzed. The results show that the zero drift rate of gravimeter varies greatly in some periods, and the maximum value is more than 10 渭 Gal/h. According to the different processing methods of zero drift correction of gravimeter, the traditional adjustment model and the improved model are used to calculate the adjustment of the observed data, and the results are compared. In the case of the same prior median error, the posterior mean error of 39 渭 Gal, gravity value is 26.5 渭 Gal, for the traditional adjustment model and 16.5 渭 Gal, for the improved model. It is much higher than the traditional adjustment model for the average accuracy of 16.5 渭 Gal, gravity value. In the stage of data preprocessing, zero drift correction according to closed observation section can effectively eliminate the influence of the sharp variation of zero drift of gravimeter, and it is obviously superior to the calculation method which regards the zero drift rate of the instrument as a fixed parameter.
【作者单位】： 中国科学院大学;中国地震局第二监测中心;中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室;中国地震局地震研究所(地震大地测量重点实验室);地壳运动监测工程研究中心;
【基金】：国家973计划(2014CB845902) 国家自然科学基金(41274085,41304059)~~
【分类号】：P223
，
本文编号：2289060
[Abstract]:Based on the mobile gravity observation data of China crustal Movement observation Network in 2000, the zero drift characteristics of 18 LCR-G relative gravimeters are analyzed. The results show that the zero drift rate of gravimeter varies greatly in some periods, and the maximum value is more than 10 渭 Gal/h. According to the different processing methods of zero drift correction of gravimeter, the traditional adjustment model and the improved model are used to calculate the adjustment of the observed data, and the results are compared. In the case of the same prior median error, the posterior mean error of 39 渭 Gal, gravity value is 26.5 渭 Gal, for the traditional adjustment model and 16.5 渭 Gal, for the improved model. It is much higher than the traditional adjustment model for the average accuracy of 16.5 渭 Gal, gravity value. In the stage of data preprocessing, zero drift correction according to closed observation section can effectively eliminate the influence of the sharp variation of zero drift of gravimeter, and it is obviously superior to the calculation method which regards the zero drift rate of the instrument as a fixed parameter.
【作者单位】： 中国科学院大学;中国地震局第二监测中心;中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室;中国地震局地震研究所(地震大地测量重点实验室);地壳运动监测工程研究中心;
【基金】：国家973计划(2014CB845902) 国家自然科学基金(41274085,41304059)~~
【分类号】：P223
，
本文编号：2289060
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