The research on the effect of dynamic tilt variation on the phase of cold atomic gravimeter

Abstract In recent years, absolute gravity comparison experiments between cold atomicgravimeter and traditional gravimeter have been carried out by combining coldatomic gravimeter with stable platform. Due to the working characteristics of thestable platform, the tilt angle of the cold atomic gravimeter will change slightlyin the process of dynamic measurement, and the measurement noise will be introduced. In order to improve the accuracy of dynamic measurement, this paper firstanalyzes the trajectory of the mirror and atom in the atomic gravimeter, obtainsthe phase expression of the atomic interferometer, evaluates the main terms ofthe gravity deviation by combining the data on the ship in the South China Sea,and then simplifies the higher-order small-terms in the main terms to deduce thesimplified form of the gravity deviation. Then, the 20-minutes data is divided into10 intervals, the power spectrum of the platform angle, angular velocity and carrier acceleration within each interval is solved. The root-mean-square value of thegravity deviation within each interval is solved by combining the transfer function of the window function. The variation trend of the root-mean-square valueis consistent with the trend of solving the gravity deviation through the trajectory. The conclusion provides the calculation method of gravity noise caused bydynamic tilt change, and also provides the basis for platform design.