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2012 European Frequency and Time Forum最新文献

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System for evaluation of long-term stability of precision quartz crystal oscillators and results of its use 精密石英晶体振荡器长期稳定性评价系统及其使用结果
Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502382
A. Nikonov, Y. Ivanov
Long-term stability (aging) is one of the key parameters of quartz crystal oscillator. Approximation and time series prediction methods are used to evaluate it. An improved mathematical model which allows to evaluate quartz crystal oscillators from the point of longterm stability (aging) has been developed. Evaluation of the stabilization of aging process is used as the basis for the model's algorithm. Basing on such model a software system has been developed. In process of it's development different approximation functions were considered, including procedure of selection of suitable functions as well as their applicability, forecast accuracy and reliability. Also accuracy of forecast vs. duration of aging testing was studied. In this way the developed software system allowed to reach forecast of 5xE-9 accuracy for long-term stability per year. Also, what is practically important, the developed mathematical model allows to minimize possible human errors in evaluation of subject long-term stability of precision oscillators.
长期稳定性(老化)是石英晶体振荡器的关键参数之一。采用逼近法和时间序列预测法对其进行评价。提出了一种改进的数学模型,可以从长期稳定性(老化)的角度来评价石英晶体振荡器。对老化过程稳定化的评价是模型算法的基础。在此基础上开发了一个软件系统。在其发展过程中,考虑了各种近似函数的选择过程,以及它们的适用性、预测精度和可靠性。并对预测精度与老化试验时间的关系进行了研究。通过这种方式,开发的软件系统允许达到每年长期稳定的5xE-9精度的预测。此外,实际重要的是,开发的数学模型允许在评估精密振荡器的长期稳定性时最大限度地减少可能的人为错误。
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引用次数: 3
Near real-time comparison of UTC(k)'s through a Precise Point Positioning approach 通过精确点定位方法近实时比较UTC(k)
Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502399
P. Defraigne, Q. Baire, G. Cerretto, F. Lahaye, D. Rovera
The time-transfer technique based on Precise Point Positioning (PPP) allows the comparison of atomic clocks with precisions at the level of hundred picoseconds. This paper presents the results obtained in near real-time using satellite orbit and clock information from IGS real-time streams and from the NRCan Ultra Rapid products (EMU). These results can be considered quite interesting for the National Metrology Institutes, providing a new tool for monitoring their UTC(k)'s. Two different PPP software tools have been used in this study, namely “Atomium” developed and operated at ORB and the NRCan-PPP soon to be operated at INRIM and LNE-SYRTE-OP in near real-time mode. This paper presents a quantification of the degree of equivalence of the results obtained from the analysis conducted using each software as well as the operational web page available at the Royal Observatory of Belgium, providing PPP solutions for the comparison of UTC(k)'s in near real-time.
基于精确点定位(PPP)的时间传递技术允许原子钟与精度在100皮秒水平的比较。本文介绍了利用IGS实时流和NRCan超快速产品(EMU)的卫星轨道和时钟信息在近实时情况下获得的结果。这些结果可以被认为是相当有趣的国家计量研究所,提供了一个新的工具来监测他们的UTC(k)。本研究使用了两种不同的PPP软件工具,即ORB开发和运行的“Atomium”,以及即将在INRIM和line - syte - op以近实时模式运行的NRCan-PPP。本文对使用每个软件以及比利时皇家天文台可用的操作网页进行的分析所获得的结果的等效程度进行了量化,为近乎实时的UTC(k)比较提供了PPP解决方案。
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引用次数: 4
Frequency dissemination at the 19th decimal place 频率分布在小数点后第19位
Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502416
G. Grosche, O. Terra, S. Raupach, U. Sterr, H. Schnatz, A. Pape, J. Friebe, M. Riedmann, E. Rasel, S. Droste, K. Predehl, R. Holzwarth, T. Udem
Optical frequency transmission via phase-stabilized telecommunication fiber is currently the most precise technique available for disseminating frequencies. We summarize some key advances, results and applications for fiber networks spanning up to 1000 km.
通过相位稳定的通信光纤进行光频率传输是目前可用的最精确的频率传播技术。我们总结了一些关键的进展,成果和应用的光纤网络跨度达1000公里。
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引用次数: 0
Laser-pumped high-performance compact gas-cell Rb standard with < 3×10−13 τ−1/2 stability 激光泵浦的高性能紧凑气体电池Rb标准,稳定性< 3×10−13 τ−1/2
Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502431
T. Bandi, C. Affolderbach, G. Mileti, C. Calosso, C. Stefanucci, F. Merli, A. Skrivervik
We demonstrate a high-performance laser-pumped rubidium-cell atomic frequency standard exhibiting a short-term stability of < 3×10−13 τ−1/2. The key components of this standard are a Rb vapor cell of 25mm diameter and a newly developed compact microwave resonator cavity. The overall volume of the clock's physics package - including the frequency-stabilized laser head and physics package - is < 3 liters, which shows the potential of this compact clock for future portable applications.
我们展示了一种高性能激光泵浦铷电池原子频率标准,其短期稳定性为< 3×10−13 τ−1/2。该标准的关键部件是直径为25mm的Rb蒸气池和新开发的紧凑微波谐振腔。时钟的物理封装的整体体积-包括频率稳定激光头和物理封装-小于3升,这显示了这种紧凑时钟在未来便携式应用中的潜力。
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引用次数: 5
Cryogenic quartz frequency sources: Problems and perspectives 低温石英频率源:问题与展望
Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502321
M. Goryachev, P. Abbé, S. Galliou
This work presents the results of investigation of frequency sources based on cryogenic BAW quartz resonators. Two systems are considered: a passive feedback frequency stabilisation system and a fully cryogenic oscillator. The first approach improves the long-term frequency stability implementing a minimal number of electronic components at liquid helium temperatures. The second one is a BAW oscillator designed for 4K temperatures based on field-effect and bipolar transistors.
本文介绍了基于低温BAW石英谐振器的频率源研究结果。两个系统被考虑:一个被动反馈频率稳定系统和一个全低温振荡器。第一种方法在液氦温度下实现了最少数量的电子元件,提高了长期频率稳定性。第二个是基于场效应和双极晶体管为4K温度设计的BAW振荡器。
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引用次数: 1
High-speed reader for wireless resonant SAW sensors 用于无线谐振SAW传感器的高速读取器
Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502419
V. Kalinin, J. Beckley, I. Makeev
A new reader is presented that is based on a narrowband pulsed excitation of two SAW resonators contained in a differential wireless resonant sensor such as a torque senor. Simultaneous excitation of the resonators working at 433–437 MHz allows achieving a flat system frequency response up to Nyquist frequency. An interrogation algorithm and a structure of the reader ensure a torque sampling rate of at least 16 kHz and the system bandwidth of at least 8 kHz achievable at the processor clock of 150 MHz. Systematic errors caused by mutual interference of the two SAW responses, intermodulation products and aliasing are discussed. Random errors caused by the phase noise of the local oscillators are analyzed theoretically. Experimental results are also presented.
提出了一种新的读写器,它是基于一个窄带脉冲激励的两个SAW谐振器包含在差分无线谐振传感器,如扭矩传感器。在433-437 MHz工作的谐振器同时激励,可以实现平坦的系统频率响应,最高可达奈奎斯特频率。所述读取器的询问算法和结构确保在处理器时钟为150 MHz时可实现至少16 kHz的扭矩采样率和至少8 kHz的系统带宽。讨论了两个声表面波响应相互干扰、互调产物和混叠引起的系统误差。从理论上分析了本振相位噪声引起的随机误差。并给出了实验结果。
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引用次数: 11
Improving timing capabilities in 3G mobile networks 提高3G移动网络的授时能力
Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502403
R. Miškinis, D. Smirnov, E. Urba, B. Dzindzelėta
Various characteristics of time transfer over 3G mobile telecommunication networks are investigated. The investigation aims at the three typical regimes in which the modem can be operated: 1) UMTS logical CTCH (Common Traffic Channel) operating over the UMTS FACH (Forward Access Channel) physical channel; 2) UMTS data transfer logical DTCH (Dedicated Traffic Channel) operating over the UMTS DCH (Dedicated Channel) physical channel; 3) HSDPA data transfer logical DTCH (Dedicated Traffic Channel) operating over the HS-DSCH (High Speed Shared Data Channel) physical channel. It is found that the most important role in the quality of synchronization and time transfer is played by the network asymmetry, not the absolute delay time.
研究了3G移动通信网络中时间传输的各种特性。研究的目标是调制解调器可以运行的三种典型机制:1)在UMTS前向接入信道(FACH)物理信道上运行的UMTS逻辑CTCH (Common Traffic Channel);2)在UMTS DCH(专用信道)物理信道上运行的UMTS数据传输逻辑DTCH (Dedicated Traffic Channel);3) HSDPA数据传输逻辑DTCH(专用业务通道)在HS-DSCH(高速共享数据通道)物理通道上运行。研究发现,影响同步和时间传递质量的最重要因素是网络的不对称性,而不是绝对延迟时间。
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引用次数: 3
Two-way optical time and frequency transfer between IPE and BEV IPE和BEV之间的双向光学时间和频率传输
Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502405
V. Smotlacha, A. Kuna
This paper describes our experience with long term two-way optical time transfer between Czech and Austrian national time and frequency laboratories maintaining their national time and frequency standards generating the national time scales UTC(TP) and UTC(BEV), respectively. The optical link utilizes either dedicated optical fibers or Dense Wavelength Division Multiplex (DWDM) channels in all-optical production telecommunication networks. Results from the optical transfer, i.e. clock comparison and link delay including diurnal and seasonal effects are shown and also compared with GPS Common-View and Precise Point Positioning.
本文描述了我们在捷克和奥地利国家时间和频率实验室之间进行长期双向光时间传输的经验,这些实验室保持了各自的国家时间和频率标准,分别产生了国家时间尺度UTC(TP)和UTC(BEV)。光链路在全光生产电信网中使用专用光纤或密集波分复用(DWDM)信道。显示了光传输的结果,即时钟比较和链路延迟,包括日和季节影响,并与GPS Common-View和Precise Point Positioning进行了比较。
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引用次数: 32
CPT resonances in two frequency pumping and probe beam configuration 双频泵浦和探针束结构下的CPT共振
Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502393
E. Şahin, R. Hamid, M. Çelik, C. Birlikseven, G. Ozen, A. Izmailov
We have detected and analyzed narrow, high contrast coherent population trapping (CPT) resonances, which appear in transmission of the probe monochromatic light beam under action of the counter propagating two frequency laser radiation, on example of the nonclosed three level A-system formed by spectral components of the Doppler broadened D2 line of cesium atoms. Given resonances may be used in atomic frequency standards, sensitive magnetometers and in ultrahigh resolution laser spectroscopy of atoms and molecules.
本文以铯原子的多普勒增宽D2谱线组成的非闭合三能级a系为例,检测并分析了在反传播双频激光辐射作用下探测单色光在传输过程中出现的窄的、高对比度的相干居群俘获(CPT)共振。给定的共振可用于原子频率标准、灵敏磁强计以及原子和分子的超高分辨率激光光谱。
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引用次数: 1
Digital processing of beat note signals from optical frequency synthesizers 光频合成器拍音信号的数字处理
Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502413
M. Čížek, R. Smíd, Z. Buchta, J. Lazar, O. Cíp
The presented work is focused on digital processing of beat note signals from a femtosecond optical frequency comb. The efforts concentrate in two main areas: Firstly, using digital servo-loop techniques for locking free running continuous laser sources on single components of the fs comb spectrum. Secondly, we are experimenting with digital signal processing of the RF beat note spectrum produced by f-2f technique used for assessing the offset and repetition frequencies of the comb, resulting in digital servo-loop stabilization of the fs comb.
本文主要研究飞秒光频梳拍音信号的数字处理。研究工作主要集中在两个方面:首先,利用数字伺服环技术将自由运行的连续激光源锁定在fs梳光谱的单个分量上。其次,我们正在试验f-2f技术产生的射频拍音频谱的数字信号处理,用于评估梳的偏移和重复频率,从而实现fs梳的数字伺服回路稳定。
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2012 European Frequency and Time Forum
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