发布求助
文献互助 智能选刊 最新文献

2012 European Frequency and Time Forum最新文献

筛选
英文 中文
Recently result on passive hydrogen maser of SHAO by single frequency modulation 单频调制被动氢激射器的最新研究成果
2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502335
Tiexin Liu, Wenqing Xu, W.X Chen, J.Y Dai, Y. Zhang, Y. Xie, C. Lin
{"title":"Recently result on passive hydrogen maser of SHAO by single frequency modulation","authors":"Tiexin Liu, Wenqing Xu, W.X Chen, J.Y Dai, Y. Zhang, Y. Xie, C. Lin","doi":"10.1109/EFTF.2012.6502335","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502335","url":null,"abstract":"This paper introduces recently result on passive hydrogen maser of shanghai Astronomical Observatory by single frequency modulation. Digital servo system and analog servo system have been experimented. DDS is used to generate frequency modulation in the RF interrogation chain in both systems. The algorithm separating two errors is used in digital system. The traditional integrator and digital phase shift are used in analog system. An Allan standard deviation of two systems has been tested based on same physical part. Both of them have achieved at σ<inf>y</inf>(τ) < 1×10<sup>−12</sup>τ<sup>−1/2</sup> (1s≤τ≤10000s) and σ<inf>y</inf> (day) <2×10p<sup>−14</sup>.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"7 1","pages":"69-71"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76101284","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
Improved GPS receiver clock modeling for kinematic orbit determination of the GRACE satellites 改进的GPS接收机时钟建模，用于GRACE卫星的运动定轨
2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502356
U. Weinbach, S. Schon
{"title":"Improved GPS receiver clock modeling for kinematic orbit determination of the GRACE satellites","authors":"U. Weinbach, S. Schon","doi":"10.1109/EFTF.2012.6502356","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502356","url":null,"abstract":"Kinematic orbit positions of Low Earth Orbiting satellites (LEOs) derived from GPS observations are frequently used for single satellite gravity field recovery. Unfortunately, the precision of the kinematic coordinates is compromised by the estimation of the receiver clock synchronization offset in addition to the three kinematic coordinates for every observation epoch. In this paper the potential of receiver clock modeling to improve the precision of the kinematic orbit determination is investigated. The formation flying twin satellites of the Gravity Recovery And Climate Experiment (GRACE) mission are considered as a case study. A unique feature of these satellites is the combination of a dual frequency GPS receiver with an Ultra Stable Oscillator (USO), that provides the required frequency stability for the proposed clock modeling approach. Based on a piece-wise linear clock parametrization with 60 s intervals, a significant reduction of the high-frequency radial orbit differences with respect to a reduced-dynamic orbit is shown.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"110 1","pages":"157-160"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79554351","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: 8
Indoor-localization system using a Micro-Inertial Measurement Unit (IMU) 基于微惯性测量单元的室内定位系统
2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502421
F. Hoflinger, Rui Zhang, L. Reindl
{"title":"Indoor-localization system using a Micro-Inertial Measurement Unit (IMU)","authors":"F. Hoflinger, Rui Zhang, L. Reindl","doi":"10.1109/EFTF.2012.6502421","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502421","url":null,"abstract":"In this paper we present a wireless Micro-Inertial Measurement Unit (IMU) which is used for localization of people in indoor areas. The Micro-IMU is built especially for portable applications. The main target of the IMU design was to minimize the size, weight and power consumption, as much as possible whereas the performance is still comparable to commercially available wired IMUs. Through the minimum size the IMU can be integrated into clothes or shoes and provide the full functionality of pedometers. In an experiment the Micro-IMU was mounted on a shoe for detecting the human movement. With sensor data-fusion based on Kalman Filter and ZUPT (Zero Velocity Update) Algorithm we could track a person in an indoor area.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"18 1","pages":"443-447"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79223777","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: 27
Project of a satellite slow beam atomic clock with CPT-Ramsey registration 具有CPT-Ramsey注册的卫星慢束原子钟项目
2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502392
V. Zholnerov, A. Vershovskiy, Y. Rozhdestvenskiy
{"title":"Project of a satellite slow beam atomic clock with CPT-Ramsey registration","authors":"V. Zholnerov, A. Vershovskiy, Y. Rozhdestvenskiy","doi":"10.1109/EFTF.2012.6502392","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502392","url":null,"abstract":"A scheme of a satellite slow-beam microwave atomic clock is presented. A modified Zeeman slower is used for longitudinal cooling of the atomic beam, and a combined CPT-Ramsey registration technique with space domain separation is used for the signal registration.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"6 1","pages":"320-322"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75660785","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
Laser gyroscopes for very high sensitive applications 用于非常高灵敏度应用的激光陀螺仪
2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502422
J. Belfi, N. Beverini, B. Bouhadef, G. Carelli, D. Cuccato, A. D. Di Virgilio, A. Licciardi, E. Maccioni, A. Ortolan, G. Saccorotti, F. Stefani
{"title":"Laser gyroscopes for very high sensitive applications","authors":"J. Belfi, N. Beverini, B. Bouhadef, G. Carelli, D. Cuccato, A. D. Di Virgilio, A. Licciardi, E. Maccioni, A. Ortolan, G. Saccorotti, F. Stefani","doi":"10.1109/EFTF.2012.6502422","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502422","url":null,"abstract":"We present a summary of the recent results obtained with the “G-Pisa” laser gyroscope prototype in the field of rotational metrology. The experimental apparatus consists in an He-Ne laser having a planar square cavity 1.35 m in side that can be operated both in the vertical and in the horizontal plane. For about one year, the ring laser has been utilized by the Virgo gravitational wave interferometer with the aim of estimating and monitoring the local rotational noise which is degrading the performances of its inertial suspensions. Results in the field of environmental monitoring for the improvement of the suspension control as well as the results in the field of rotational seismology are presented. In the last part of the paper we present some considerations about the possibility of performing a ground-based General Relativity test using an array of ring lasers.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"31 1 1","pages":"448-452"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78425131","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
Towards first active clock based on mode-locked InGaN VECSEL with rubidium vapor cell saturable absorber 基于带铷蒸汽电池饱和吸收体锁模InGaN VECSEL的首个有源时钟
2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502344
X. Zeng, D. Boiko
{"title":"Towards first active clock based on mode-locked InGaN VECSEL with rubidium vapor cell saturable absorber","authors":"X. Zeng, D. Boiko","doi":"10.1109/EFTF.2012.6502344","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502344","url":null,"abstract":"We report the first detailed theoretical study of mode-locking dynamics in an active atomic clock based on a 420 nm wavelength, III-nitride vertical external cavity surface emitting laser with a 85Rb vapor cell as the intracavity saturable absorber.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"11 1","pages":"105-108"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78428187","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
Towards wall-coated microfabricated cells: Alkali vapor-cells using indium thin-film low-temperature bonding 向壁涂微加工电池发展:使用铟薄膜低温键合的碱蒸汽电池
2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502389
R. Straessle, Y. Petremand, D. Briand, N. D. de Rooij, M. Pellaton, C. Affolderbach, G. Mileti
{"title":"Towards wall-coated microfabricated cells: Alkali vapor-cells using indium thin-film low-temperature bonding","authors":"R. Straessle, Y. Petremand, D. Briand, N. D. de Rooij, M. Pellaton, C. Affolderbach, G. Mileti","doi":"10.1109/EFTF.2012.6502389","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502389","url":null,"abstract":"We report on the realization and evaluation of micro-fabricated alkali vapor cells using a thin-film indium bonding technique. Optical and double-resonance spectroscopy performed on the cells demonstrates their suitability for atomic clock applications. Long-term measurements show a stable pressure inside the cells and therefore an excellent hermeticity of the bonding over several months. The low bonding process temperature of ≤ 140°C combined with good bond strength makes this method a promising candidate for realizing micro-fabricated alkali cells with anti-relaxation wall-coatings.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"10 1","pages":"309-311"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88650650","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
Cr:ZnSe laser with 0.03 Hz/Hz1/2 frequency noise for compact methane based OFS 0.03 Hz/Hz1/2频率噪声的Cr:ZnSe激光器用于小型甲烷基OFS
2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502425
M. Gubin, M. Frolov, A. Kireev, Y. Korostelin, V. Kozlovskyi, Y. Podmar’kov, A. Shelkovnikov, D. Tyurikov, V. Lazarev, A. Pnev
{"title":"Cr:ZnSe laser with 0.03 Hz/Hz1/2 frequency noise for compact methane based OFS","authors":"M. Gubin, M. Frolov, A. Kireev, Y. Korostelin, V. Kozlovskyi, Y. Podmar’kov, A. Shelkovnikov, D. Tyurikov, V. Lazarev, A. Pnev","doi":"10.1109/EFTF.2012.6502425","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502425","url":null,"abstract":"The mid-IR cw tunable solid state Cr<sup>2+</sup>:ZnSe laser with spectral density of intrinsic frequency noise less than 30 mHz/Hz<sup>1/2</sup> was created. The laser was applied for sub-Doppler spectroscopy of (ν<inf>1</inf>+ν<inf>4</inf>) vibrational-rotational band of methane and narrow resonances of saturated dispersion at λ = 2.36 µm were demonstrated for the first time. Characteristics of resonances and low frequency noise of the laser pave the way to a short-term frequency stability at the level of 10<sup>−15</sup> – 10<sup>−16</sup>.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"17 1","pages":"459-461"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90493593","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
Short-term stability of GNSS on-board clocks using the polynomial method 用多项式方法研究GNSS星载时钟的短期稳定性
2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502347
J. Delporte, C. Boulanger, F. Mercier
{"title":"Short-term stability of GNSS on-board clocks using the polynomial method","authors":"J. Delporte, C. Boulanger, F. Mercier","doi":"10.1109/EFTF.2012.6502347","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502347","url":null,"abstract":"The stability of on-board clocks is an essential issue in the performance of Global Navigation Satellite Systems (GNSS). We developed a straightforward method (the polynomial method) that allows to determine the short term stability of a GNSS on-board clock for a pass over a ground station driven by a clock, the characteristics of which are better than the space clock we want to characterize. In previous papers [1,2], we validated the method on GPS on-board clocks using IGS clock products as reference. In this paper, we continue this work with GLONASS, Galileo, COMPASS/Beidou and QZSS on-board clocks.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"1 1","pages":"117-121"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90501113","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: 9
Push-pull optical pumping on the Cs D1-transition cs1跃迁的推挽光泵浦
2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502387
E. Breschi, A. Weis
{"title":"Push-pull optical pumping on the Cs D1-transition","authors":"E. Breschi, A. Weis","doi":"10.1109/EFTF.2012.6502387","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502387","url":null,"abstract":"We report on preliminarily results of push-pull optical pumping (PPOP) on the D1-transition of cesium. PPOP is based on a coherent population trapping effect prepared with polarization-modulated bichromatic light coupling the two ground-state hyperfine levels, the light polarization being modulated at the microwave frequency. With a suitable choice of polarizations, a single specific coherent superposition (dark state) formed by the two mF = 0 sublevels can be prepared under optimal conditions. This increase the contrast of the clock reference signal without significant line-broadening.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"17 1","pages":"300-303"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82091370","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信