高性能铷原子钟频率长期特性参量估值算法研究

针对时间同步设备中广泛使用的铷原子钟长期特性参量估值问题,提出了一种三维状态参量实时估值模型,通过对真空及常压下连续运行两个月以上铷原子钟输出频率的连续监测,将哈德玛方差进行最小二乘非线性拟合,提取铷原子钟状态估值模型噪声参数,得到铷原子钟状态参量估值。结果表明,利用该状态估值模型对铷原子钟频率漂移率进行估值,与目前国内检定规范中通用的最小二乘估值模型相比,估值误差明显减小,更反映铷原子钟频率漂移率的实时变化情况。

Long-term Parameter Estimation of High Performance Rubidium Atomic Clocks

To focus on the main parameters predictions of high performance rubidium clocks widely used in time keeping systems, a three dimensional state vector estimation model of rubidium clock was presented. The parameters used in this clock estimation model were based on Hadamard variance by nonlinear curve fitting in least-squares sense. With daily data points observed successively for more than 2 months, the state vector estimations of Rubidium clock were obtained. Compared the estimations of the model with the least-squares model, it showed that the characteristic parameters estimation error is much smaller than least-squares linear model, the Model can give the frequency aging rate of rubidium clocks in real time.