Abstract:In this paper, we eliminate outliers in observation data by RANSAC algorithm, and the linear interpolation method is used to complete the data set. The relative gravity value between two points is extracted by overall projection calculation, and its accuracy and standard deviation are tested. The results show that the maximum residual value of dynamic gravity observation is 4.641 μGal, and the maximum repeatable standard deviation is 4.384 μGal, both less than 5 μGal. This method can obtain high-precision gravity observation data, and provides a new method for obtaining relative gravity values in complex environments.