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Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.最新文献

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Clock management data analysis for satellite communications 卫星通信时钟管理数据分析
Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1573966
R. Gross, R. Melkers
{"title":"Clock management data analysis for satellite communications","authors":"R. Gross, R. Melkers","doi":"10.1109/FREQ.2005.1573966","DOIUrl":"https://doi.org/10.1109/FREQ.2005.1573966","url":null,"abstract":"The U.S. Naval Research Laboratory has installed GPS-based timing systems in several defense satellite communication system (DSCS-III) satellite communication facilities to support the single channel transponder (SCT) program. The goal of these systems was to manage the satellite crystal oscillators to 25 microsecond accuracy and ground cesium clocks to 5 microsecond accuracy. A windows-compatible computer program was written to facilitate the clock management of these oscillators. This paper describes these systems, as well as give detailed data analysis of the time management for the satellite oscillators.","PeriodicalId":108334,"journal":{"name":"Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125539279","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
System for a remote readout of multiple passive sensors using 31 THz quantum cascade laser 系统用于远程读出多个无源传感器使用31太赫兹量子级联激光
Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1574052
M. Taslakov, V. Simeonov
{"title":"System for a remote readout of multiple passive sensors using 31 THz quantum cascade laser","authors":"M. Taslakov, V. Simeonov","doi":"10.1109/FREQ.2005.1574052","DOIUrl":"https://doi.org/10.1109/FREQ.2005.1574052","url":null,"abstract":"We report on an application of a pulsed distributed feedback quantum cascade laser (QCL) for long open path readout system of multiple passive temperature, pressure, humidity or other sensors. Unlike the usually used active sensors, containing radio or optical data transmitters, the presented system does not contains any active transmitters at the sensors side. The QCL and the receiver are displaced on one side of the path. On the opposite path side, a modified Michelson interferometer, based on corner cube retroreflectors, is placed. One retroreflector is fixed and another one is attached to the appropriate sensor, which moves it when the measured parameter is changed. The useful travel range of the movable retroreflector is less than lambda/2 (4.8 mum) to obtain a monotonic transfer function between the measured parameters and the received signals. This system measures distances in the micrometer and sub-micrometer range but displaced up to a few kilometers from the transmitter/receiver station. A relatively long laser pulse of 150-200 ns is used to scan the interferometers and to read out the information. During the pulse, the QCL frequency is swept within a 40 GHz range. This frequency sweeping allows decreasing significantly the influence of the atmospheric turbulence over the accuracy of the data transfer. When the swept radiation illuminates the interferometer, oscillations in the received signal occur due to the interference between the different parts of the beam. The period of the oscillations and the oscillation phase depend on the distance between retroreflectors and the changes in this distance, respectively. The main advantage of the system proposed is that a single transmitter-receiver pair allows reading out multiple sets of completely passive sensors offering high level of data protection due to the low beam divergency","PeriodicalId":108334,"journal":{"name":"Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130414713","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
Low phase noise VCSO with diamond SAW resonators 带金刚石SAW谐振器的低相位噪声VCSO
Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1573981
S. Fujii, Y. Takada, H. Harima
{"title":"Low phase noise VCSO with diamond SAW resonators","authors":"S. Fujii, Y. Takada, H. Harima","doi":"10.1109/FREQ.2005.1573981","DOIUrl":"https://doi.org/10.1109/FREQ.2005.1573981","url":null,"abstract":"L and S-band VCSOs with diamond SAW resonators have been developed based on Lesson's model. First, the crystallinity of diamond thin film required for high-frequency SAW resonators was characterized by Raman scattering and electron backscattering diffraction. From these measurements, it was found that the propagation loss of SAW was lowered in relatively degraded films having small crystallites, and preferential grain orientation. After optimizing CVD growth conditions, a 3.4 GHz diamond SAW resonator with low insertion loss and high Q-value has been successfully developed. Second, by using the diamond SAW resonators, and employing low temperature co-fired ceramics, L and S-band VCSOs with a low phase noise were successfully obtained","PeriodicalId":108334,"journal":{"name":"Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116549667","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: 12
Low phase noise UHF TCXO 低相位噪声UHF TCXO
Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1573983
D. Bogomolov, R. Boroditsky
{"title":"Low phase noise UHF TCXO","authors":"D. Bogomolov, R. Boroditsky","doi":"10.1109/FREQ.2005.1573983","DOIUrl":"https://doi.org/10.1109/FREQ.2005.1573983","url":null,"abstract":"Low phase noise, good frequency stability over wide temperature range, tight initial frequency calibration and low power consumption of the signals sources are essential for many modern communication applications operating in UHF frequency band. The best sample of TCXO can provide good combination of these parameters only in 10divide50 MHz frequency band. A frequency translation technique should be applied to transform those signals in UHF band without phase noise degradation. UHF VCXO looked by PLL on a signal of 10 MHz TCXO allows to keep a good temperature stability and to achieve a phase noise level Lphi(1 kHz) = -108 dBc/Hz at 1 GHz carrier frequency. The circuit optimization allows decreasing an influence of PLL noise and obtaining a spectral purity of output signal, the level of a comparison frequency signal doesn't exceed -85 dBc","PeriodicalId":108334,"journal":{"name":"Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134351583","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: 15
Characterization of nanostructured features of thin films of zinc oxide grown by sol-gel spin process 溶胶-凝胶自旋法制备氧化锌薄膜的纳米结构特征
Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1573917
H. Bahadur, A. Srivastava, S. Garg, P. Pal, S. Chandra
{"title":"Characterization of nanostructured features of thin films of zinc oxide grown by sol-gel spin process","authors":"H. Bahadur, A. Srivastava, S. Garg, P. Pal, S. Chandra","doi":"10.1109/FREQ.2005.1573917","DOIUrl":"https://doi.org/10.1109/FREQ.2005.1573917","url":null,"abstract":"Thin films of ZnO find application in various sensing devices. We present here the results of our studies on thin films of ZnO grown by sol-gel spin process. Zinc acetate and zinc nitrate were used as precursor materials for preparing the sols. The films grown by these precursors show different types of morphologies. The films grown using zinc acetate show much smoother topographical features than those grown using zinc nitrate as precursor materials. On the other hand, using the zinc nitrate as the precursor, we have observed the nanosized needles of ZnO. These needles could form the basis of fabrication of piezoelectric fine tips for a practical application in scanning tunneling spectroscopy and atomic force microscopy and other sensors","PeriodicalId":108334,"journal":{"name":"Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133035781","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: 3
The non-linear equivalent circuit of the vibrating Y-cut GaPO/sub 4/ resonator 振动y型切口GaPO/sub - 4/谐振器的非线性等效电路
Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1574033
J. Nosek, M. Pustka, L. Burianova
{"title":"The non-linear equivalent circuit of the vibrating Y-cut GaPO/sub 4/ resonator","authors":"J. Nosek, M. Pustka, L. Burianova","doi":"10.1109/FREQ.2005.1574033","DOIUrl":"https://doi.org/10.1109/FREQ.2005.1574033","url":null,"abstract":"In this work, a new form of solution resulting from non-linear equivalent electrical circuit of the piezoelectric (YX1)0deg GaPO4 resonators is given. The influence of the excitation current on the resonant frequency and its mathematical description makes necessary the introduction of a non-linear impedance characteristic of the piezoelectric resonator. This influence was modeled by the non-linear electrical equivalent circuit; the equivalent series resistance, equivalent motional inductance, and equivalent motional capacitance are taken to be functions of the amplitude of the excitation current by means of the relations derived in the work. The equivalent circuit was analyzed by the method of equivalent linearization. The relationships between the amplitudes of voltage applied on the Y-cut GaPO4 resonator and the first current harmonics or phases-frequency dependence of the excited resonator, respectively, are derived. Amplitude jumps are discussed","PeriodicalId":108334,"journal":{"name":"Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134161934","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
Dynamic frequency response of the auto-tuned hydrogen maser to systematic perturbations 自调谐氢脉泽对系统扰动的动态频率响应
Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1573974
H. E. Peters
{"title":"Dynamic frequency response of the auto-tuned hydrogen maser to systematic perturbations","authors":"H. E. Peters","doi":"10.1109/FREQ.2005.1573974","DOIUrl":"https://doi.org/10.1109/FREQ.2005.1573974","url":null,"abstract":"This paper discusses the frequency stability of atomic hydrogen masers which use the cavity frequency-switching automatic cavity frequency stabilization system. The theoretical response of the maser output frequency when the cavity frequency is perturbed by systematic perturbations is presented and compared with experimental measurements. A new and improved implementation of the auto-tuner design is also introduced which has promise to significantly improve the long term stability of the hydrogen maser","PeriodicalId":108334,"journal":{"name":"Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124547103","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
Time Comparisons by GPS C/A, GPS P3, GPS L3 and TWSTFT at KRISS GPS C/A、GPS P3、GPS L3和TWSTFT在KRISS的时间比较
Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1574023
Sung-hoon Yang, Chang-Bok Lee, Young Kyu Lee, Ji Ae Han, Y. J. Heo
{"title":"Time Comparisons by GPS C/A, GPS P3, GPS L3 and TWSTFT at KRISS","authors":"Sung-hoon Yang, Chang-Bok Lee, Young Kyu Lee, Ji Ae Han, Y. J. Heo","doi":"10.1109/FREQ.2005.1574023","DOIUrl":"https://doi.org/10.1109/FREQ.2005.1574023","url":null,"abstract":"We present an overview of time transfer activities at Korea Research Institute of Standards and Science (KRISS). During the last few years, we have equipped the geodetic receivers for P code and carrier phase measurements, and built two-way satellite time and frequency transfer (TWSTFT) system to improve the time comparison accuracy. Now, we are conducting the time comparisons between KRISS and National Institute of Information and Communications (NICT, Japan) including several institutes in Asia using various GPS time transfer methods such as GPS C/A code, P3 code, carrier phase, and TWSTFT techniques. The equipment for time transfers are TTR6, 3S-R100, Euro-80, and a geodetic receiver (Z12-T) for GPS link, and multi-channel TWSTFT via JCSAT-1B satellite for two-way link. From the all data, we have compared and evaluated the differences between the various comparison methods by GPS versus TWTSTF","PeriodicalId":108334,"journal":{"name":"Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124252572","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: 2
Optical lattice laser 光学点阵激光器
Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1574003
Jingbiao Chen, Xuzong Chen
{"title":"Optical lattice laser","authors":"Jingbiao Chen, Xuzong Chen","doi":"10.1109/FREQ.2005.1574003","DOIUrl":"https://doi.org/10.1109/FREQ.2005.1574003","url":null,"abstract":"Atoms with narrow-linewidth transition trapped within the Lamb-Dick regime of optical lattice are proposed be used as laser gain medium to build a laser. The gain medium atoms can be the alkaline-earth species, Magnesium, Calcium, and Strontium, including Ytterbium. These atoms possess promising super-narrow optical clock transitions, but here, this clock transition is proposed to be used as the lasing transition of the output laser. This optical lattice laser with expected super-narrow linewidth is an active optical clock with high accuracy and stability.","PeriodicalId":108334,"journal":{"name":"Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.","volume":"155 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123094486","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: 43
The new PTB caesium fountain clock CSF2 新的PTB铯喷泉钟CSF2
Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1573942
R. Wynands, A. Bauch, D. Griebsch, R. Schroder, S. Weyers
{"title":"The new PTB caesium fountain clock CSF2","authors":"R. Wynands, A. Bauch, D. Griebsch, R. Schroder, S. Weyers","doi":"10.1109/FREQ.2005.1573942","DOIUrl":"https://doi.org/10.1109/FREQ.2005.1573942","url":null,"abstract":"At PTB, a second caesium fountain clock, CSF2, is in the process of being set up. It differs from the first PTB caesium fountain standard CSF1 in a number of details, which are consecutively specified. First cold atoms have been prepared in the new apparatus","PeriodicalId":108334,"journal":{"name":"Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.","volume":"448 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132023146","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
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