锁相环路对氢原子钟性能影响的实验分析

实验以上海天文台SOHM-4型氢原子钟脉泽信号和新研制的模拟-数字混合型锁相环路为基础,主要分析锁相环路参数对氢原子钟输出信号的短期频率稳定度和单边带相位噪声的影响。针对氢脉泽信号高Q值的特殊性,通过理论分析和实验验证寻求与其相匹配的最佳环路参数。实验结果表明,锁相环路的参数设置直接影响到氢原子钟输出信号的性能;在脉泽信号不变的情况下,改进后的锁相环路和主电子学系统可使氢原子钟的频率稳定度提高至1.7×10^-13/1s, 3.3×10^-14/10s, 9.1×10^-15/100s, 2.9×10^-15/1 000s, 1.4×10^-15/10000s,即较之原有的技术指标,在各取样时间范围内,频率稳定度的测试结果均提高了半个量级。

Experiments on the Phase-locked Loop Contribution on Specifications of the Masers

Based on the new generation analog-digital mixed phase-locked loop and SOHM-4 maser of Shanghai Observatory, the experiments mainly analyzed the contribution brought by parameters of phase-locked loop to both the short-term frequency stability and the signal-side-band phase noise of the output signal of the hydrogen masers. By theoretical analysis and experimental verification, the best loop parameters matching with the specific maser of high Q value is explored. Results showed that the parameter setting of phase-locked loop could definitely influence specifications of the masers output signal. And the improved phase-locked loop and main electronic system could upgrade the frequency stability of the maser to 1.7×10^-13/1s, 3.3×10^-14/10s, 9.1×10^-15/100s, 2.9×10^-15/1000s, 1.4×10^-15/10000s,half-amplitude upper to the former specifications in each sample time.