TianQin-1卫星第一轮结果
The First Round Result from the TianQin-1 Satellite
摘要：
天琴一号卫星（TQ-1）是天琴项目的第一颗技术示范卫星，于2019年12月20日发射。第一轮实验已于二零一九年十二月二十一日至二零二零年四月一日进行。卫星的剩余加速度在$0.1~{\rm Hz}\,$处约为$1\times10^{-10}~{\rm m}/{\rm s}^{2}/{\rm Hz}^{1/2}$，在$0.05~{\rm Hz}\,$处约为$5\times10^{-11}~{\rm m}/{\rm s}^{2}/{\rm Hz}^{1/2}$，由在$0.1~{\rm Hz}\,$处灵敏度为$5\times10^{-12}~{\rm m}/{\rm s}^{2}/{\rm Hz}^{1/2}$的惯性传感器测量。微型牛顿推进器在$0.1~{\rm Hz}$试验中证明了$0.1~μ{\rm N}$的推力分辨率和$0.3~μ{\rm N}/{\rm Hz}^{1/2}$的推力噪声。具有无阻力控制的卫星的残余噪声是在$0.1~{\rm Hz}\,$处的$3\times10^{-9}~{\rm m}/{\rm s}^{2}/{\rm Hz}^{1/2}$。在$0.1~{\rm Hz}\,$处，光学读出系统的噪声水平约为$30~{\rm pm}/{\rm Hz}^{1/2}$。温度监测位置的温度稳定度控制在每轨道$\pm3~{\rm mK}$左右，卫星质心与试验质量质心的失配测量精度优于$0.1~{\rm mm}$。
英文摘要：
The TianQin-1 satellite (TQ-1), which is the first technology demonstration satellite for the TianQin project, was launched on 20 December 2019. The first round of experiment had been carried out from 21 December 2019 until 1 April 2020. The residual acceleration of the satellite is found to be about $1\times10^{-10}~{\rm m}/{\rm s}^{2}/{\rm Hz}^{1/2}$ at $0.1~{\rm Hz}\,$ and about $5\times10^{-11}~{\rm m}/{\rm s}^{2}/{\rm Hz}^{1/2}$ at $0.05~{\rm Hz}\,$, measured by an inertial sensor with a sensitivity of $5\times10^{-12}~{\rm m}/{\rm s}^{2}/{\rm Hz}^{1/2}$ at $0.1~{\rm Hz}\,$. The micro-Newton thrusters has demonstrated a thrust resolution of $0.1~μ{\rm N}$ and a thrust noise of $0.3~μ{\rm N}/{\rm Hz}^{1/2}$ at $0.1~{\rm Hz}$. The residual noise of the satellite with drag-free control is $3\times10^{-9}~{\rm m}/{\rm s}^{2}/{\rm Hz}^{1/2}$ at $0.1~{\rm Hz}\,$. The noise level of the optical readout system is about $30~{\rm pm}/{\rm Hz}^{1/2}$ at $0.1~{\rm Hz}\,$. The temperature stability at temperature monitoring position is controlled to be about $\pm3~{\rm mK}$ per orbit, and the mismatch between the center-of-mass of the satellite and that of the test mass is measured with a precision of better than $0.1~{\rm mm}$.
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