frequency drift

The designed DCXO adopts Pierce architecture. The frequency drift correction is done by using a 6-bit automatic frequency control ( AFC) signal generated by the feedback correction loop between the oscillator and the base band. The long term stable frequency output has been obtained.

所设计的数控晶体振荡器采用Pierce结构，利用基带与振荡器的反馈环路产生的6位自动频率控制信号，对振荡器的频率漂移进行校准，能得到长期稳定的频率输出。

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This paper realized these two use, and conclusions could got by analyzing the time deviation, frequency deviation, frequency drift, Allan deviation and the noise coefficient. All these conclusions have proved that Kalman algorithm can achieve better results in these two ways.

论文实现了这两类运用，通过对滤波后时差、频差、频漂、Allan偏差以及噪声系数的分析，得出结论，证明Kalman滤波算法在这两类运用中都能取得较理想的结果。

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Doppler frequency drift and timing error were considered in state transform equations.

状态方程综合考虑了多普勒频移、定时误差.

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By analyzing the thermal effect to amplifier, we build the frequency drift model.

并分析温度、湿度等外界环境变化对放大器电路非线性变化的影响，建立60GHz系统频率漂移的物理模型。

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The hydrogen maser is the most stable frequency standard generally available today for all but the shortest measuring times. For long measuring times of 10 4s or longer, its performance typically deteriorates due to frequency drift of high Q resonant cavity.

氢脉泽是至今为止除极短时间测量间隔之外最稳定的频率标准，对于104s或更长的测量时间间隔，它的性能由于高Q值谐振腔而引起频率漂移而变坏。

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