Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.最新文献_第7页

Ion-acoustic plasma waves in rf-discharge lamps: light-shift stabilization for atomic clocks 射频放电灯中的离子声等离子体波:原子钟的光移稳定

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1573977

J. Camparo, C. Klimcak

引用次数: 1

Distributed cavity phase and the associated power dependence 分布腔相位和相关的功率依赖性

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1573909

R. Li, K. Gibble

{"title":"Distributed cavity phase and the associated power dependence","authors":"R. Li, K. Gibble","doi":"10.1109/FREQ.2005.1573909","DOIUrl":"https://doi.org/10.1109/FREQ.2005.1573909","url":null,"abstract":"We discuss the power dependence of distributed cavity phase errors for cylindrical TE011 cavities in laser-cooled atomic fountain clocks. The azimuthally symmetric phase variations produce a surprisingly large distributed cavity phase error for two 2pi, 4pi, and 6pi pulses. This is due to the correlation between the transverse variation of the Rabi frequency over the cavity aperture and a quadratic density variation of the atomic sample, along with the symmetry of the longitudinal phase variation in the cavity. We show that the large azimuthally symmetric fields and phase shifts near the walls of the endcap holes produce very small errors at optimal power for a uniform wall resistance. We also show the power variation for higher order azimuthal variations m=1, 2, and 4. These may be caused by fountain tilts, nonuniform detection of atoms, and asymmetries in the laser trapping and cooling of the atoms. We demonstrate that distributed cavity phase errors in physical cavities may have no variation with the microwave power. A combination of rigorous calculations of cavity losses, measurements of power dependence, the atomic distributions, and fountain tilts, and electrical measurements that show the lower limit of the cavity Q and the cavity symmetry, should provide stringent limits on distributed cavity phase errors for current atomic clocks","PeriodicalId":108334,"journal":{"name":"Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.","volume":"1 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":"122536323","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

Optimal estimation of clock values and trends from finite data 从有限数据中对时钟值和趋势进行最优估计

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1573962

C. Greenhall

引用次数: 1

Experimental assessment of the time transfer capability of precise point positioning (PPP) 精确点定位(PPP)时间传递能力的实验评估

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1573955

D. Orgiazzi, P. Tavella, F. Lahaye

{"title":"Experimental assessment of the time transfer capability of precise point positioning (PPP)","authors":"D. Orgiazzi, P. Tavella, F. Lahaye","doi":"10.1109/FREQ.2005.1573955","DOIUrl":"https://doi.org/10.1109/FREQ.2005.1573955","url":null,"abstract":"In recent years, many national timing laboratories have installed geodetic global positioning system (GPS) receivers together with their traditional GPS/GLONASS common view (CV) receivers and two way satellite time and frequency transfer (TWSTFT) equipment. A method called precise point positioning (PPP) is in use in the geodetic community allowing precise recovery of geodetic GPS receiver position, clock phase and tropospheric delay by taking advantage of the International GNSS Service (IGS) precise products. Natural Resources Canada (NRCan) has developed software implementing the PPP and a previous assessment of the PPP as a promising time transfer method was carried out at Istituto Elettrotecnico Nazionale (IEN) in 2003. This paper reports on a more systematic work performed at IEN and NRCan to further characterize the PPP method for time transfer application, involving data from nine national timing laboratories. Dual-frequency GPS observations (pseudorange and carrier phase) over the last ninety days of year 2004 were processed using the NRCan PPP software to recover receiver clock estimates at five minute intervals, using the IGS final satellite orbit and clock products. The quality of these solutions is evaluated mainly in terms of short-term noise. In addition, the time and frequency transfer capability of the PPP method were assessed with respect to independent techniques, such as TWSTFT, over a number of European and Transatlantic baselines","PeriodicalId":108334,"journal":{"name":"Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.","volume":"66 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":"130486056","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: 59

Redundancy and correlations in TAI time links TAI时间链路中的冗余和相关性

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1573956

G. Petit, Z. Jiang

引用次数: 7

Laser cooling and launching performance in a (1,1,1)-geometry atomic fountain (1,1,1)几何原子喷泉激光冷却与发射性能

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1573946

E. Donley, T. Heavner, J. O'Brien, S. Jefferts, F. Levi

引用次数: 3

German timing expertise to support Galileo 德国授时专家支持伽利略

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1574026

J. Hammesfahr, A. Moudrak, S. Bedrich

引用次数: 0

Design and preliminary characterization of the USNO rubidium fountain USNO铷喷泉的设计与初步表征

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1573949

S. Peil, S. Crane, T. Swanson, C. Ekstrom

引用次数: 11

Progress in building NRC's cesium fountain clock 核管会铯喷泉钟的建造进展

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1573940

L. Marmet, P. Dubé, C. Gigault

引用次数: 3

Locking lasers with large FM noise to high Q cavities 将具有大调频噪声的激光器锁定到高Q腔

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1574058

L. Duan, K. Gibble

引用次数: 11