DGS-AT1M型海洋重力仪静态观测结果分析与评估

Analysis and assessment of static measurement results from a DGS-AT1M marine gravimeter

海洋重力仪的性能直接决定测量数据的质量,而海洋重力仪稳定性则是反映仪器性能的关键性指标。本文结合DGS-AT1M型海洋重力仪静态试验,分析了静态试验过程中影响观测结果的主要因素,研讨了海洋重力仪静态试验稳定性评估方法及流程,对该型海洋重力仪稳定性进行了分析与评估。首先,计算了理论固体潮重力值变化,改正了固体潮对静态观测结果的影响;然后,对单日观测数据以及整体数据进行分析;最后,根据稳定性评估流程,利用固体潮改正后的剩余观测值计算了仪器的零漂率、月漂以及准确度。计算表明,该型重力仪试验月漂值为-1.020 mGal,零漂线性良好且漂移率为-0.034 mGal/day,设备的测量准确度为0.085 mGal,符合重力测量的规范要求,可用于高精度海洋重力测量。

The performance of marine gravimeters directly determines the quality of measured data,while their stability serves as a critical indicator reflecting their performance.Based on the static test conducted using a DGS-AT1M marine gravimeter,this study analyzed the dominant factors affecting the measured results in the static test.It explored the method and process for stability assessment in the static test,analyzing and assessing the stability of this marine gravimeter.First,this study calculated the changes in the theoretical gravity value of earth tide,correcting the earth tide effect on static measurement results.Then,this study analyzed the single-day data and the overall data.Finally,based on the stability assessment process,this study calculated the zero-drift rate,monthly drift,and accuracy of the marine gravimeter using the residual measured values after earth tide correction.The calculation results show that this marine gravimeter yielded a monthly drift value of-1.020 mGal,and high zero drift linearity at a drift rate of-0.034 mGal/day.This marine gravimeter exhibited a measurement accuracy of 0.085 mGal,aligning with the gravity survey specifications.Therefore,it can be applied to high-precision marine gravity surveys.