Analysis and assessment of static measurement results from a DGS-AT1M marine gravimeter
The performance of marine gravimeters directly determines the quality of measured data,while their stability serves as a crit-ical indicator reflecting their performance.Based on the static test conducted using a DGS-AT1M marine gravimeter,this study ana-lyzed 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 ac-curacy of the marine gravimeter using the residual measured values after earth tide correction.The calculation results show that this ma-rine 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.
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