2012 European Frequency and Time Forum最新文献_第9页

Analysis of the impact of measurement noise on the TWSTFT stability 测量噪声对TWSTFT稳定性的影响分析

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502397

A. Kanj, J. Achkar, D. Rovera

{"title":"Analysis of the impact of measurement noise on the TWSTFT stability","authors":"A. Kanj, J. Achkar, D. Rovera","doi":"10.1109/EFTF.2012.6502397","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502397","url":null,"abstract":"The Two-Way Satellite Time and Frequency Transfer (TWSTFT) is widely used by the time institutes to compare ground atomic clocks and contributes to the production of the Temps Atomique International (TAI) calculated by the BIPM. In the past, TWSTFT links have frequency stability of 1×10−15 at one day [1], and since the last three years, two-way links became more and more noisy and the frequency stability has been degraded which has motivated the present work. In order to improve the performance of the TWSTFT technique, we focused on the principle parameters that impact the measurements stability and accuracy. In completion to the previous work [2] on the measurement noise in TWSTFT, we analyzed the impact of the changes of reference clock, satellite and satellite transponder on the two-way link instability over the period of the last five years. In addition, we studied the contribution in measurement noise on the two-way links of the following parameters: the chip-rates of the pseudo random noise modulation of the transmitted signal, the power of the transmitted and received signals. We also use the satellite simulator to determine the dependence of the chip rates on the delay difference of the OP ground stations. We completed the work in analyzing the variation of the short term residual noise fluctuations [3] and the carrier to noise ratio of the received signals in function of the previously listed parameters. Different results are presented in this paper and possible issues for improvement of the two-way links are proposed.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"151 1","pages":"340-344"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76839830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Wall-coated cells for Rb atomic clocks: Study of the ripening process by double-resonance spectroscopy 铷原子钟壁包细胞:用双共振光谱研究成熟过程

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502340

M. Pellaton, C. Affolderbach, G. Mileti, R. Straessle, D. Briand, N. D. de Rooij

引用次数: 1

Direct comparison of two Cryocooled Sapphire Oscillators presenting relative frequency instability at 10−15 直接比较在10 - 15时相对频率不稳定的两个冷冻蓝宝石振荡器

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502380

S. Grop, B. Dubois, J. Masson, P. Bourgeois, Y. Kersalé, E. Rubiola, G. Haye, V. Giordano

引用次数: 1

Time-to-Digit Converter Based on radiation-tolerant FPGA 基于耐辐射FPGA的时间-数字转换器

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502384

M. Peca, M. Vacek, V. Michálek

{"title":"Time-to-Digit Converter Based on radiation-tolerant FPGA","authors":"M. Peca, M. Vacek, V. Michálek","doi":"10.1109/EFTF.2012.6502384","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502384","url":null,"abstract":"Architecture of a time-to-digit converter (TDC) is presented. TDC is an electronic device which measures time of arrival of discrete electronic pulses, with respect to reference time base. Our work on TDC is motivated by its applications in field of long-range laser distance measurement and time synchronization. Unlike earlier time interpolation methods, we have chosen all-digital approach based on pulse propagation through tapped delay line. We do not expect it could outperform recent invention of time interpolation using narrow-band filter excitation [1], [2]. However, our approach relies on a standard digital circuitry only. With space applications in mind, we are implementing the TDC into a space qualified, radiation-tolerant field-programmable gate array (FPGA). On top of related works [4] and [5] on all-digital TDCs, delay line, we try to gather more complete information about the sampled pulse. It is done by sampling of whole bit vector, corresponding to all of the delay line taps. A calibration method based on random pulse source is discussed, including preliminary results. Impact of physical FPGA cell placement on resulting time measurement granularity is observed. Actually measured jitter distribution is compared to normal distribution function, giving an insight of absolute accuracy limit of our approach within the given FPGA platform.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"42 1","pages":"286-289"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88479429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Development of QZSS-mobile station qzss移动站的开发

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502401

H. Narita, J. Amagai, M. Aida, Y. Takahashi, I. Nakazawa, M. Nakamura, H. Ujihara, S. Hama

引用次数: 0

A small-linewidth absolute optical frequency source 一种小线宽绝对光频源

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502423

S. Raupach, T. Legero, A. Bauch, C. Grebing, C. Hagemann, T. Kessler, A. Koczwara, B. Lipphardt, H. Schnatz, U. Sterr, G. Grosche

引用次数: 0

Towards the detection of high-contrast Cs CPT resonances using a single modulated diode laser 利用单调制二极管激光器探测高对比度CPT共振

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502388

X. Liu, E. Kroemer, J. Merolla, R. Boudot

引用次数: 1

Investigation of drive level dependencies of higher overtones in SC quartz resonators SC石英谐振器中高泛音驱动电平依赖性的研究

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502372

V. Stofanik, Z. Brezović, M. Minárik

{"title":"Investigation of drive level dependencies of higher overtones in SC quartz resonators","authors":"V. Stofanik, Z. Brezović, M. Minárik","doi":"10.1109/EFTF.2012.6502372","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502372","url":null,"abstract":"In this paper we illustrate our experimental investigations of drive level dependencies of two higher overtones (the 5th and the 7th ones), as well as of the main mode (the 3rd overtone) of several different stress compensated (SC) quartz resonators. The drive level dependencies of basic parameters in the simple Butterworth-Van Dyke one-port equivalent circuit of the particular mode were derived from the impedance vs. frequency responses measured in the vicinity of the particular modes, while temperature of the investigated resonator was maintained approximately at the lower turnover point temperature of the main mode. In the 3rd overtone 10-MHz SC quartz resonators, for example, the 5th overtone or the 7th overtone (the c-modes, i.e. the slow thickness-shear modes of vibration) can be exited simultaneously along with the main c-mode, with assistance of an appropriate dual-mode or multi-mode crystal oscillator (DMXO or MMXO); and the resonator self-temperature-sensing can be reliably implemented [1], [2], [3]. Level of amplitudes of particular modes, which are simultaneously excited in DMXO or MMXO, has impact on short-term, as well as on long-term frequency instabilities of generated signals; hence drive levels of individual c-modes have to be set-up properly in the oscillator circuit.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"20 1","pages":"227-234"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80884512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Phononic crystal sensors 声子晶体传感器

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502366

R. Lucklum

引用次数: 8

Fiber optic RF frequency transfer on the distance of 480 km with the active stabilization of the propagation delay 光纤射频频率传输在480千米的距离上具有主动稳定的传播延时

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502417

L. Sliwczynski, P. Krehlik, L. Buczek, M. Lipinski, J. Kołodziej

引用次数: 2