基于采样方差的卫星钟信号分析

Analysis of Satellite Clocks Signal Based on Sample Variance

对原子钟频率稳定度分析受到频率漂移的影响进行定性分析,明确了不同类型方差在原子钟频率稳定度分析中的适用范围,首次提出将重叠Hadamard方差应用于卫星钟信号分析。分别利用Allan方差、Hadamard方差和重叠Hadamard方差对铷钟进行了稳定度计算,结果表明Allan方差的计算结果受频率漂移影响很大,而Hadamard系列方差能够有效克服频率漂移的影响,对于卫星钟的性能表征具有良好的效果。

The influences of the satellite clocks＇ frequency drift to the Allan variance and Hadamard variance is analyzed, then respective scopes of Allan variance and Hadamard variance in frequency stability analysis of atomic clocks is defined. Overlapping Hadamard variance were suggested to be used in analyzing frequency stability analysis of satellite clocks for the first time. The Allan variance, Hadamard variance and overlapping Hadamard variance of the rubidium clocks is computed. Results indicate that Allan variance was greatly influenced by frequency drift, and Hadamard variance （overlapping Hadamard variance included） is able to overcome the influence of frequency drift. They are suitable for the satellite clocks.