Chen P, Yu M, Deng Z, Zhang M, Liu J, Fan J, Hu C, Tu L
MOE Key Laboratory of Fundamental Physical Quantities Measurement & Hubei Key Laboratory of Gravitation and Quantum Physics, PGMF and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
Rev Sci Instrum. 2022 Feb 1;93(2):024501. doi: 10.1063/5.0077151.
In a rotating accelerometer gravity gradiometer (RAGG), rotary table wobble refers to the shift in the direction of the spin axis during operation. This motion causes errors in the output of the RAGG, but the mechanism is not clear. The purpose of this paper is to analyze the relationship between rotary table wobble and RAGG errors and to propose a method for rejecting these errors. We consider the influence of attitude changes, angular velocity, and angular acceleration caused by the wobble on the specific force, and we describe the error transmission process based on the accelerometer configuration and its measurement principle. Furthermore, we show through a simulated experiment that when the angular velocity noise caused by the wobble is 1 μrad/s, this will produce errors of tens of E. We propose a post-error correction method that is based on the higher-precision RAGG model and motion measurement. The errors in the two channels of the RAGG are reduced to 3.69 E and 1.85 E after error correction. The error analysis of the effects of wobble on a RAGG and the proposed error correction method are of great significance for the development of high-precision gradiometers.
在旋转加速度计重力梯度仪（RAGG）中，转台摆动是指设备运行期间自旋轴方向的偏移。这种运动会导致RAGG输出出现误差，但其机制尚不清楚。本文旨在分析转台摆动与RAGG误差之间的关系，并提出一种消除这些误差的方法。我们考虑了摆动引起的姿态变化、角速度和角加速度对比力的影响，并根据加速度计配置及其测量原理描述了误差传递过程。此外，我们通过模拟实验表明，当摆动引起的角速度噪声为1微弧度/秒时，这将产生数十E的误差。我们提出了一种基于高精度RAGG模型和运动测量的误差后校正方法。误差校正后，RAGG两个通道的误差分别降至3.69 E和1.85 E。摆动对RAGG影响的误差分析以及所提出的误差校正方法对高精度梯度仪的发展具有重要意义。
