频率标准瞬态稳定度的精密测量

为解决常用数字化计数测量信号瞬态噪声和短期稳定度精度不高的问题，采用创新的相位重合检测技术来测量频率源的瞬态稳定度．多个不同分辨率的重合检测线路的状态可以转换成为相位起伏的幅度信息．测量的分辨率取决于重合检测电路的不稳定性．实验中采用的标准信号是超高稳定度晶体振荡器，被测信号分别为高稳定度的晶体振荡器和指标明显差的恒温晶体振荡器，利用相位重合检测技术均能够正确反映出实际稳定度情况．频率源的瞬态稳定度的测量对于频率源实时短期不稳定度以及远端相位噪声的描述具有重要的作用．

Precise measurement of the transient stability of frequency standards

In order to solve measurement of transient noise and short-term stability of signals by conventional digital counting methods is not only difficult but also low in accuracy. So we introduce a novel phase coincidence detection technology which is an important detection method, and our group has worked on it for decades to measure the frequency source transient stability. According to the results of multiple phase coincidence detection circuits which are combined as a coincidence detection array, the detailed phase variation can be obtained. The measurement resolution depends on the stability of the coincidence detection circuit. In our experiment, the standard signal is a super-high stability crystal oscillator, measured signals are from the high stability crystal oscillator and OCXO whose parameters are significantly worse. Using the phase coincidence detection technique is able to properly reflect the actual stability situation. The measurement of transient stability of the frequency source plays an important part in the real-time short-term stability and the characterization of distal phase noise, so its accurate measurement is of great significance.