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Implementation of high-precision inertial reference for Taiji-1 satellite and its ground evaluation based on torsion pendulum system

Changchun Institute of Optics, Fine Mechanics and Physics, CAS, Changchun 130033, China

Taiji Laboratory for Gravitational Wave Universe (Beijing/Hangzhou), University of Chinese Academy of Sciences (UCAS), Beijing 100049, China

School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, UCAS, Hangzhou 310024, China

E-mail Address: wz070611@126.com

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On behalf of The Taiji Scientific Collaboration

For more details, please refer to article 2102002 of this Special Issue.

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https://doi.org/10.1142/S0217751X21400108Cited by:0 (Source: Crossref)

This article is part of the issue:

Special Issue on Taiji Program in Space for Gravitational Universe with the First Run Key Technologies Test in Taiji-1
Guest Editors: Yue-Liang Wu and Wen-Rui Hu

Abstract

As the key measurement load of Taiji-1 satellite, inertial sensor detects the acceleration disturbance of test mass (TM) under nonconservative force in line with the basic principle of capacitive sensing, while keeping the TM in equilibrium position through electrostatic drive. In order to ensure the smooth progress of the mission, it is necessary to test and evaluate the performance of inertial sensor on the ground. In this paper, a torsion pendulum system is designed to eliminate the influence of the Earth’s gravity so as to meet the requirements of ground test. The experimental results show that the inertial sensor in closed-loop control mode can stably keep the TM at equilibrium position. At the same time, the ground detection of acceleration resolution of inertial sensor is greatly affected by ground vibration noise. If the inertial sensor operates normally in space, its acceleration resolution can reach $3.96 \times 10^{- 9} m / s^{2} / \sqrt{Hz}$ $3.96 \times 10^{- 9} m / s^{2} / \sqrt{Hz}$ , thus meeting the requirement of Taiji-1.

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