一种改进的高精度频率源钟差仿真方法

A Modified Method for Clock Error Simulation of High Precision Frequency Source

提出了一种适用于高精度频率源仿真的钟差仿真方法。从频率源的噪声特性及噪声幂率谱模型入手,利用[-1,1]范围内服从均匀分布的随机变量模拟各类噪声的特性,并给出了各类噪声模拟产生的数学表达式。在此基础上,提出了基于牛顿迭代法求解噪声参数的新方法,避免了噪声参数拟合过程中进行线性近似带来的误差,并进行了试验验证。试验结果表明,所提出的钟差模拟方法适用于不同类型的原子钟以及高稳晶振的钟差模拟仿真,模拟产生的钟差数据的阿伦偏差与实测值非常接近,能很好地反映各种噪声对钟差数据的影响,可以满足高精度频率源模拟仿真的需求。

An advanced approach to generating clock errors is presented that fits a high precision frequency source.Starting from the noise characteristics and noise power spectrum model,a new method for solving the noise parameters based on the Newton iterative method is proposed. Using these results as input,a sequence of clock errors are then obtained using the random variable subject to the uniform distributionin the range of [-1,1]. Then,an experiment is carried out to test the performance of this simulation method. The Allan deviation of the simulation data is close to the reference value,and can reflect the effect of all kinds of noise on clock errors. It refers that the proposed simulation method is applicable for the clock error simulation of different types of atomic clocks and high stability crystal oscillators.