摘要
本文对伽利略系统实验精确授时中心(EPTS)中四台原子钟的主要特性进行了分析。首先基于原子钟的信号模型和时域上的实验测量数据,用Allan方差对各原子钟的频率稳定度进行了计算与分析。其次运用最小二乘算法对短期和长期的时域稳定度数据进行线性拟合,根据拟合斜率鉴别了影响EPTS中各原子钟的主要噪声类型。实验结果表明,EPTS中具有高短期稳定度的氢原子钟和三台高长期稳定度的铯原子钟满足在GSTB-V1阶段产生实验伽利略系统时间(EGST)的设计要求。
The main characteristics of four atomic clocks in Galileo system Experimental Precise Timing Station （EPTS） are analyzed in this paper. Based on the signal model of atomic clock and the time-domain measurement data from experiments, the frequency stabilities of all atomic clocks were calculated and analyzed using Allan variance at first. Applying Least Square algorithm, the linear fitting of short-term and long-term stability data in timedomain was carried out. According to the slopes of fitting, the noise types affecting the atomic clocks in EPTS were identified. Experiment results show that the high short-term-stability Hydrogen Maser and three high long-term-stability Cesium atomic clocks fulfill the design requirements of generating Experimental Galileo System Time （EGST） in the phase of Galileo System Test Bed V1 （ GSTB-V1 ）.
出处
《电子测量与仪器学报》
CSCD
2007年第5期35-39,共5页
Journal of Electronic Measurement and Instrumentation
基金
伽利略系统欧亚教育与应用开发资助项目(编号:CN/ASIA-IT&C/007-90685)
