Analysis of Field Test Results for the RAI-g Quantum Gravimeter

Quantum gravity observation is a cutting-edge measurement technology that provides high accuracy and continuous observation, and is free from calibration factor and drift errors. This technology showcases immense potential in the field of geodesy. At the current stage, field tests of quantum gravimeters are essential to evaluate their performance in field observational environments. This paper employs the mobile absolute gravity observation method for field testing. The RAI-g quantum gravimeter was used to observe at three field gravity observation stations: Wuhan Institute, Jiufeng, and Xiangfan. The observation data were processed to obtain gravity values and their precision information, and the results were compared with those measured by the FG5X absolute gravimeter. The tests reveal the following two key insights. First, the RAI-g quantum gravimeter is capable of achieving normal continuous absolute gravity observation in urban and suburban vibration environments. White noise dominates the data throughout the observation process, with gravity value observation precision better than 2×10^-8 m/s² and correctness better than 10×10^-8 m/s². Second, the instrument's sensitivity is found to be influenced by the background noise level of the gravity station. Specifically, the sensitivity calculated from RAI-g gravimeter measurements observed at the Wuhan Institute station located in an urban area is 357×10^-8 m/(s²·Hz^1/2), while the results from Jiufeng and Xiangfan stations in suburban areas exhibit sensitivities of 72×10^-8 m/(s²·Hz^1/2) and 89×10^-8 m/(s²·Hz^1/2), respectively. The RAI-g quantum gravimeter achieved excellent observation results at all three gravity stations, but its long-term stability still requires further testing and validation.