Multiaccelerometer-Based Method for High-Precision Angular Acceleration Measurement of Turntable

The high-precision turntable plays a crucial role in the measurement of inertial sensors, aerospace applications, and other fields, and thus, it is imperative to evaluate and measure its angular acceleration error accurately, particularly in a rotating accelerometer gravity gradiometer (RAGG). To address the issues of delay and noise amplification caused by differentiation in traditional measurement methods, such as grating and gyroscope, this article proposes a novel measurement method based on the combination of high-precision accelerometers. First, a numerical model is established through principle derivation followed by obtaining an analytical model through error analysis. Second, the simulation verification and preliminary experimental measurements are conducted. Finally, a comparison experiment with commercial gyroscope is designed to further validate the proposed method. The experimental results demonstrate that compared to the gyroscope, the proposed method exhibits lower a static noise level: 1.601 x 10(-7 )(rad/s(2))/Hz(1/2) at 0.2-5 Hz, which surpasses the performance of high-precision fiber optic gyroscopes by more than one order of magnitude. Therefore, this innovative multiaccelerometer-based method can be considered as a favorable option for measuring angular acceleration with ultralow-noise levels on high-precision turntables.