摘要
根据小演变换的奇异性检测原理，分析了环境温度变化对原子钟特性的影响；基于小坡变换的信号重建原理，将温度变化引起原子钟相位－时间起伏进行时域一频域分析；用小演变换理论分析了由于昼夜温度变化引起原子钟周期性波动的原因，结合传统的谱分析方法，认证了原子钟相位－时间起伏的周期性。结果表明：在有环境温度调节的环境中，氢原子钟的相位－时间起伏标准差为41ns左右；在一般环境中，铯原子钟的相位－时间起伏标准基为21ns左右，改善环境条件可以提高原子钟的频率稳定度。
The variation of performance of an atomic clock is a typical nonstationary process.Linear and stationary models do not suit to the variation of a real atomic clock. We haveattached great importance to ejecting the environment temperature effect acting on atomicclocks. Some papers analysed the relationship between environment temperature and thevariation of phase-time of an atomic clock by means of the traditional correlation method,but the result was not a quantitative one. With the unique function of detection of thewavelet theory, the atomic clock temperature response is analysed. Based on the signal reconstruction priciple of the wavelet the0oy, the variation of phase-time of an atondc clockwith the changes of environment temperature is extracted. The periodic undulation of theperformence of an atomic clock with the temperature variation during a whole day has beenshown to be obvious by means of both the methods, wavelet theory and the traditional correlation. The standard deviation of the phase-time undulation of the hydrogen maser atCSAO is 41ns in the temperature-controlled environment with the temparature of 23℃±1℃, while that of a Cesium clock in a temperature-uncontrolled enviroment is 21ns. Thefrequency stability of an atomic clock can certainly be improved when the enviroment temperature is kept constant.The method of wavelet transform and signal reconstructure given in this paper is ofpracticality and has been examined with the results provided here to be suitable to a nonlinear and nonstationary process.
出处
《陕西天文台台刊》
CSCD
1997年第6期36-42,共7页
Publications of The Shaanxi Astronomical Observatiory
关键词
原子钟
周期变化
环境温度
小波变换
Wavelet Theory
Atomic Clock
Enevironment Temperature
