利用精密单点定位技术评估晶振频率稳定度
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摘要
在评估晶振频率稳定度时,目前常用一个频率稳定度比待测晶振高3倍以上的时钟作为参考,造成测试成本高昂。在分析精密单点定位(Precise Point Positioning,PPP)技术原理的基础上,提出了一种基于PPP技术的频率稳定度评估方法,并利用该方法对一款秒稳达到10-12的高稳定度恒温晶振(Oven Controlled Crystal Oscillator,OCXO)进行了评估,评估结果与利用氢原子钟为参考的传统频率稳定度评估方法基本吻合。最后给出了该方法对不同等级晶振的评估能力。该方法结构简单,测试方便且成本低廉,能满足常用时频设备(如通信设备、卫星导航接收机)的晶振评估需求。
At present,the commonly used frequency stability measurement method requires a reference frequency source whose frequency stability is more than 3 times than that of the frequency source to be evaluated,resulting in high test cost. According to the analysis of the principle of precise point positioning( PPP),a method based on PPP technology is proposed for evaluating frequency stability.With this method,a high stability oven controlled crystal oscillator( OCXO) with short stability about 10-12 is used for frequency stability evaluation and the evaluation results are basically consistent with the traditional frequency measurement method using the hydrogen atomic clock as a reference. Finally,the evaluation ability of the method for different grades of crystal oscillator is given.The method has the advantages of simple structure,convenient testing and low cost,and can meet the crystal evaluation requirements of commonly used timefrequency devices such as communication devices and satellite navigation receivers.
At present,the commonly used frequency stability measurement method requires a reference frequency source whose frequency stability is more than 3 times than that of the frequency source to be evaluated,resulting in high test cost. According to the analysis of the principle of precise point positioning( PPP),a method based on PPP technology is proposed for evaluating frequency stability.With this method,a high stability oven controlled crystal oscillator( OCXO) with short stability about 10-12 is used for frequency stability evaluation and the evaluation results are basically consistent with the traditional frequency measurement method using the hydrogen atomic clock as a reference. Finally,the evaluation ability of the method for different grades of crystal oscillator is given.The method has the advantages of simple structure,convenient testing and low cost,and can meet the crystal evaluation requirements of commonly used timefrequency devices such as communication devices and satellite navigation receivers.
引文
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[5]刘永刚,孟真,阎跃鹏.高准确度数字式时频域实时频率测量系统[J].电讯技术,2010,50(9):28-32.
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[8]朱荷欢,吴向阳,高成发,等.GPS系统精密单点定位模型与精密授时研究[J].东南大学学报(自然科学版),2013,43(s2):423-427.
[9] ALLAN D W.Time and frequency(time-domain)characterization,estimation,and prediction of precision clocks and oscillators[J].IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control,1987,34(6):647-654.
[10]张敏.原子钟噪声类型和频率稳定度估计的自由度分析与探讨[D].西安:中国科学院研究生院(国家授时中心),2008.
[11]朱峰.卫星导航中的时间参数及其测试方法[D].西安:中国科学院研究生院(国家授时中心),2015.
[12]郭斐,张小红,李星星,等.GPS系列卫星广播星历轨道和钟的精度分析[J].武汉大学学报(信息科学版),2009,34(5):589-592.
[13]黄观文.GNSS星载原子钟质量评价及精密钟差算法研究[D].西安:长安大学,2012.
[14] RAY J,SENIOR K.Geodetic techniques for time and frequency comparisons using GPS phase and code measurements[J].Metrologia,2005,42(4):215-232.
[2] KOPPANG P,LELAND R.Steering of frequency standards by the use of linear quadratic Gaussian control theory[J].Physical Review E(Statistical Nonlinear&Soft Matter Physics),1996,63(6):138-158.
[3]魏丰,朱广伟,王瑞清,等.一种GPS校准的数字式高精度守时钟[J].仪器仪表学报,2011,32(4):920-926.
[4]孙莹.高稳晶振的秒级频率稳定度的测量[J].计测技术,2003,23(4):38-39.
[5]刘永刚,孟真,阎跃鹏.高准确度数字式时频域实时频率测量系统[J].电讯技术,2010,50(9):28-32.
[6] PETOVELLO M G,LACHAPELLE G. Using standalone GPS to evaluate precise oscillator stability in the time domain[C]//Proceedings of International Technical Meeting of the Satellite Division of the Institute of Navigation,Nashville:ION,1999:1081-1090.
[7]张小红,蔡诗响,李星星,等.利用GPS精密单点定位进行时间传递精度分析[J].武汉大学学报(信息科学版),2010,35(3):274-278.
[8]朱荷欢,吴向阳,高成发,等.GPS系统精密单点定位模型与精密授时研究[J].东南大学学报(自然科学版),2013,43(s2):423-427.
[9] ALLAN D W.Time and frequency(time-domain)characterization,estimation,and prediction of precision clocks and oscillators[J].IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control,1987,34(6):647-654.
[10]张敏.原子钟噪声类型和频率稳定度估计的自由度分析与探讨[D].西安:中国科学院研究生院(国家授时中心),2008.
[11]朱峰.卫星导航中的时间参数及其测试方法[D].西安:中国科学院研究生院(国家授时中心),2015.
[12]郭斐,张小红,李星星,等.GPS系列卫星广播星历轨道和钟的精度分析[J].武汉大学学报(信息科学版),2009,34(5):589-592.
[13]黄观文.GNSS星载原子钟质量评价及精密钟差算法研究[D].西安:长安大学,2012.
[14] RAY J,SENIOR K.Geodetic techniques for time and frequency comparisons using GPS phase and code measurements[J].Metrologia,2005,42(4):215-232.