Pub Date : 2012-04-23DOI: 10.1109/EFTF.2012.6502409
Pengpeng Li, Yuanling Li, Lei Chen, Baiyu Li, G. Ou
For the satellite navigation receiver, the channel characteristic including amplitude and group delay is a determining factor for ranging and zero estimating accuracy. The technology about group delay equalizing by all-pass network in the RF system is analyzed in this paper. The quality factor Q of LC components, which affects the group delay equalization, is the key of application research. Computer simulation results based on some special RF system shows the way to make a target of the delay equalization and choose LC components with special Q, and give out three important conclusions to guidance the homologous application. Finally, the analytical results are verified, completes the second-order all-pass network circuit hardware, and cascades it with the RF circuit, the entire amplitude and group delay characteristics is im-proved as wish. The test results analyzed with Agilent vector network analyzer show that, group delay fluctuations of the equalization passband is about 7∼8ns, amplitude-frequency passband fluctuation is 1.5dBm, the initial value is 137ns and 1dBm. The method could be used to improve the group delay equalization in the wider passband of RF front-end channel, and has important reference value in group delay equalization goal setting, program feasibility study and Q value selection.
{"title":"The influence of LC components' quality factor Q for GNSS receiver's group delay equalization","authors":"Pengpeng Li, Yuanling Li, Lei Chen, Baiyu Li, G. Ou","doi":"10.1109/EFTF.2012.6502409","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502409","url":null,"abstract":"For the satellite navigation receiver, the channel characteristic including amplitude and group delay is a determining factor for ranging and zero estimating accuracy. The technology about group delay equalizing by all-pass network in the RF system is analyzed in this paper. The quality factor Q of LC components, which affects the group delay equalization, is the key of application research. Computer simulation results based on some special RF system shows the way to make a target of the delay equalization and choose LC components with special Q, and give out three important conclusions to guidance the homologous application. Finally, the analytical results are verified, completes the second-order all-pass network circuit hardware, and cascades it with the RF circuit, the entire amplitude and group delay characteristics is im-proved as wish. The test results analyzed with Agilent vector network analyzer show that, group delay fluctuations of the equalization passband is about 7∼8ns, amplitude-frequency passband fluctuation is 1.5dBm, the initial value is 137ns and 1dBm. The method could be used to improve the group delay equalization in the wider passband of RF front-end channel, and has important reference value in group delay equalization goal setting, program feasibility study and Q value selection.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"1128 1","pages":"392-395"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87702780","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}
Pub Date : 2012-04-23DOI: 10.1109/EFTF.2012.6502332
A. Zarzycki, X. Vacheret, O. Bel, D. Picchedda, J. Boy
In this paper we report new results on collective fabrication of resonators, designed to work at about ten MHz, on 4″ SC-cut quartz wafer. In this frame, their spherical curvature has been changed into discretized shape composed on two (or three) steps. For fabrication of the proposed design, two independent methods were investigated: - deep reactive ion dry etching (DRIE) and - wet chemical etching in two different etchants.
{"title":"Collective fabrication of BAW resonators on 4″ SC-cut quartz wafers","authors":"A. Zarzycki, X. Vacheret, O. Bel, D. Picchedda, J. Boy","doi":"10.1109/EFTF.2012.6502332","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502332","url":null,"abstract":"In this paper we report new results on collective fabrication of resonators, designed to work at about ten MHz, on 4″ SC-cut quartz wafer. In this frame, their spherical curvature has been changed into discretized shape composed on two (or three) steps. For fabrication of the proposed design, two independent methods were investigated: - deep reactive ion dry etching (DRIE) and - wet chemical etching in two different etchants.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"70 ","pages":"58-61"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91446615","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}
Pub Date : 2012-04-23DOI: 10.1109/EFTF.2012.6502322
G. Rovera, M. Abgrall, M. Siccardi
We report the characterization of the first prototype of an new Auxiliary offset Generator developed for steering the 100 MHz output of H Masers.
我们报告了一种新的辅助偏置发生器的第一个原型的特性，该发生器用于控制H脉泽的100 MHz输出。
{"title":"Characterization of an Auxiliary offset Generator for steering of H Masers","authors":"G. Rovera, M. Abgrall, M. Siccardi","doi":"10.1109/EFTF.2012.6502322","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502322","url":null,"abstract":"We report the characterization of the first prototype of an new Auxiliary offset Generator developed for steering the 100 MHz output of H Masers.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"13 1","pages":"14-15"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79604324","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}
Pub Date : 2012-04-23DOI: 10.1109/EFTF.2012.6502357
S. Raupach, H. Schnatz, G. Grosche, S. Droste
When comparing independent simultaneous measurements of the same, non-constant frequency, synchronization errors between the frequency counter's gate time intervals lead to an apparent frequency deviation between the measurements. Here we present a technique that allows for a remote measurement of the counters' synchronization offset with sub-microsecond accuracy using a phase-stabilized fiber link.
{"title":"Measuring the relative synchronization error of frequency counters with sub-μs accuracy via a phase-stabilized fiber link","authors":"S. Raupach, H. Schnatz, G. Grosche, S. Droste","doi":"10.1109/EFTF.2012.6502357","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502357","url":null,"abstract":"When comparing independent simultaneous measurements of the same, non-constant frequency, synchronization errors between the frequency counter's gate time intervals lead to an apparent frequency deviation between the measurements. Here we present a technique that allows for a remote measurement of the counters' synchronization offset with sub-microsecond accuracy using a phase-stabilized fiber link.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"236 1","pages":"161-162"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86696603","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}
Pub Date : 2012-04-23DOI: 10.1109/EFTF.2012.6502324
R. Le Targat, L. Lorini, M. Gurov, M. Zawada, R. Gartman, B. Nagórny, P. Lemonde, J. Lodewyck
Two optical lattice clocks operated on the transition 1S0-3P0 of the 87Sr atom are now operational at the LNE-SYRTE laboratory, their comparison aims at demonstrating that no systematic effect has been overlooked in their respective accuracy budgets. In this proceeding we focus only on trapping effects, we discuss technical aspects of the calibration of the lattice induced light shifts, and we show the observation of the second order light shift. Data resulting from the comparisons are reported and discussed.
{"title":"Comparison of two Strontium optical lattice clocks in agreement at the 10−16 level","authors":"R. Le Targat, L. Lorini, M. Gurov, M. Zawada, R. Gartman, B. Nagórny, P. Lemonde, J. Lodewyck","doi":"10.1109/EFTF.2012.6502324","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502324","url":null,"abstract":"Two optical lattice clocks operated on the transition 1S0-3P0 of the 87Sr atom are now operational at the LNE-SYRTE laboratory, their comparison aims at demonstrating that no systematic effect has been overlooked in their respective accuracy budgets. In this proceeding we focus only on trapping effects, we discuss technical aspects of the calibration of the lattice induced light shifts, and we show the observation of the second order light shift. Data resulting from the comparisons are reported and discussed.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"52 1","pages":"19-22"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90071998","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}
Pub Date : 2012-04-23DOI: 10.1109/EFTF.2012.6502391
L. Balet, J. Haesler, S. Lecomte
As an alternative to coherent population trapping (CPT), stimulated Raman scattering in an atomic vapor and implemented in an optoelectronic microwave oscillator can be designed as a compact microwave frequency reference. Due to its simplified architecture and as an active atomic clock, it has the potential to be less energy demanding than CPT. In this paper, we present experimental results on the behavior and frequency stability of a tabletop Raman oscillator.
{"title":"VCSEL-based Raman frequency reference on Rubidium atoms","authors":"L. Balet, J. Haesler, S. Lecomte","doi":"10.1109/EFTF.2012.6502391","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502391","url":null,"abstract":"As an alternative to coherent population trapping (CPT), stimulated Raman scattering in an atomic vapor and implemented in an optoelectronic microwave oscillator can be designed as a compact microwave frequency reference. Due to its simplified architecture and as an active atomic clock, it has the potential to be less energy demanding than CPT. In this paper, we present experimental results on the behavior and frequency stability of a tabletop Raman oscillator.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"17 1","pages":"316-319"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78428043","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}
Pub Date : 2012-04-23DOI: 10.1109/EFTF.2012.6502330
A. Clairet, T. Laroche, L. Couteleau, J. Boy
In this paper, we report on the use of Finite Elements Software to model and simulate new resonator designs, working at about 9 MHz. We aim to review the concept of BVA resonator by reducing the size. The miniaturization of the whole resonator will allow us to use collective processes and therefore reduce the cost of manufacturing. To achieve this result, we investigated to replace the radius of curvature, necessary for a good trapping of the vibrating energy at this frequency, by several mesas.
{"title":"Modeling of BVA resonator for collective fabrication","authors":"A. Clairet, T. Laroche, L. Couteleau, J. Boy","doi":"10.1109/EFTF.2012.6502330","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502330","url":null,"abstract":"In this paper, we report on the use of Finite Elements Software to model and simulate new resonator designs, working at about 9 MHz. We aim to review the concept of BVA resonator by reducing the size. The miniaturization of the whole resonator will allow us to use collective processes and therefore reduce the cost of manufacturing. To achieve this result, we investigated to replace the radius of curvature, necessary for a good trapping of the vibrating energy at this frequency, by several mesas.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"67 6 1","pages":"49-52"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75939843","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}
Pub Date : 2012-04-23DOI: 10.1109/EFTF.2012.6502437
K. Liang, A. Zhang, Xiaoxun Gao, Weibo Wang, Dayu Ning, Side Zhang
Time and frequency transfer techniques based on GPS and GLONASS were studied. On the basis of Topcon GNSS receiver module, one new type of GNSS time and frequency transfer receiver named NIMTFGNSS-1 has been developed and its scheme has been accounted for. Compared with several popular GPS time and frequency transfer receivers made aboard in the world by the common clock difference experiments and the long baseline experiments, the performance of the receiver has been tested and verified. Its time and frequency transfer noise level can match those of the several commercial receivers and the time stabilities from the GPS code and carrier phase results in the common clock difference experiments using two NIMTFGNSS-1 receivers during a few days are separately within 1 ns and 100 ps and the GLONASS code results is with 4 ns.
{"title":"Study and development of a New GNSS receiver for time and frequency transfer","authors":"K. Liang, A. Zhang, Xiaoxun Gao, Weibo Wang, Dayu Ning, Side Zhang","doi":"10.1109/EFTF.2012.6502437","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502437","url":null,"abstract":"Time and frequency transfer techniques based on GPS and GLONASS were studied. On the basis of Topcon GNSS receiver module, one new type of GNSS time and frequency transfer receiver named NIMTFGNSS-1 has been developed and its scheme has been accounted for. Compared with several popular GPS time and frequency transfer receivers made aboard in the world by the common clock difference experiments and the long baseline experiments, the performance of the receiver has been tested and verified. Its time and frequency transfer noise level can match those of the several commercial receivers and the time stabilities from the GPS code and carrier phase results in the common clock difference experiments using two NIMTFGNSS-1 receivers during a few days are separately within 1 ns and 100 ps and the GLONASS code results is with 4 ns.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"48 1","pages":"529-536"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84866577","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}
Pub Date : 2012-04-23DOI: 10.1109/EFTF.2012.6502334
G. U. Gamm, T. Ungan, L. Reindl
Separate wake-up receiver circuits for wireless sensor nodes combine the advantage of permanent accessibility with a very low current consumption, enabling nodes to work for several years. In a sleeping node incoming signals are passively demodulated and low-pass filtered. Till now we used an R-C circuit for filtering. In this work a quartz resonator is used between its parallel and serial resonance as an inductance with high Q-factor. This way higher voltages after demodulation compared to the R-C circuit could be reached. Since a higher voltage results in an increased wake-up signal detection, the wake-up range of the node can be extended.
{"title":"Using quartz resonators for maximizing wake-up range in wireless wake-up receivers","authors":"G. U. Gamm, T. Ungan, L. Reindl","doi":"10.1109/EFTF.2012.6502334","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502334","url":null,"abstract":"Separate wake-up receiver circuits for wireless sensor nodes combine the advantage of permanent accessibility with a very low current consumption, enabling nodes to work for several years. In a sleeping node incoming signals are passively demodulated and low-pass filtered. Till now we used an R-C circuit for filtering. In this work a quartz resonator is used between its parallel and serial resonance as an inductance with high Q-factor. This way higher voltages after demodulation compared to the R-C circuit could be reached. Since a higher voltage results in an increased wake-up signal detection, the wake-up range of the node can be extended.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"130 1","pages":"66-68"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85343649","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}
Pub Date : 2012-04-23DOI: 10.1109/EFTF.2012.6502346
Zhiqiang Yang, A. Zhang, Yuan Gao, K. Liang, Xiaoxun Gao
TWSTFT is one of the most precise technique of time and frequency transfer, NIM established TWSTFT system in the year 2008 and participated the Europe-Asia TWSTFT link. We analyze the TWSTFT comparative results of NIM and PTB, TL, NICT. It is shown that Europe-Asia TWSTFT link is stable. The frequency stability(1day) is better than 5 × 10−15. The comparative result of TWSTFT system coincides with GPS system.
{"title":"Experiment research of Europe-Asia TWSTFT link","authors":"Zhiqiang Yang, A. Zhang, Yuan Gao, K. Liang, Xiaoxun Gao","doi":"10.1109/EFTF.2012.6502346","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502346","url":null,"abstract":"TWSTFT is one of the most precise technique of time and frequency transfer, NIM established TWSTFT system in the year 2008 and participated the Europe-Asia TWSTFT link. We analyze the TWSTFT comparative results of NIM and PTB, TL, NICT. It is shown that Europe-Asia TWSTFT link is stable. The frequency stability(1day) is better than 5 × 10−15. The comparative result of TWSTFT system coincides with GPS system.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"13 1","pages":"113-116"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82649512","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}
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