Demonstration of a Physics Package with High SNR for Rubidium Atomic Frequency Standards
The frequency stability of a rubidium atomic frequency standard (RAFS) depends mainly on the signal to noise ratio (SNR) of atomic discrimination signal provided by the physics package. In order to improve further the frequency stability of our RAFS, a ne
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Demonstration of a Physics Package with High SNR for Rubidium Atomic Frequency Standards Wenbing Li, Songbai Kang, Gang Ming, Feng Zhao, Feng Qi, Fang Wang, Shaofeng An, Da Zhong and Ganghua Mei
Abstract The frequency stability of a rubidium atomic frequency standard (RAFS) depends mainly on the signal to noise ratio (SNR) of atomic discrimination signal provided by the physics package. In order to improve further the frequency stability of our RAFS, a new physics package with high SNR was designed recently. The physics package was designed based on an improved slotted tube cavity. Compared with our previous design, the new cavity has more uniform magnetic line distribution and larger size, so that a larger resonance cell can be used. In the design the separated filter technique (SFT) was used. A Helmholtz coil was substituted for a solenoid one to create a more uniform C field. At present a prototype of the physics package has been made. A preliminary test has been performed, and a short term frequency stability of 6 9 10-13/1 s was achieved. This result indicates that the SNR of the physics package could meet the requirement for building a RAFS with frequency stability better than 1 9 10-12/s1/2.
Keywords Rubidium atomic frequency standard Signal to noise ratio package Separated filter technique Slotted tube cavity
Physics
W. Li (&) S. Kang G. Ming F. Zhao F. Qi FangWang S. An D. Zhong G. Mei Key Laboratory of Atomic Frequency Standards of Chinese Academy of Sciences, Wuhan Institute of Physics and Mathematics, Wuhan 430071, China e-mail: [email protected] G. Mei e-mail: [email protected] W. Li University of Chinese Academy of Sciences, Beijing 100049, China
J. Sun et al. (eds.), China Satellite Navigation Conference (CSNC) 2013 Proceedings, Lecture Notes in Electrical Engineering 245, DOI: 10.1007/978-3-642-37407-4_41, Ó Springer-Verlag Berlin Heidelberg 2013
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W. Li et al.
41.1 Introduction The on-board atomic frequency standard is a key part of a Global Navigation Satellite System (GNSS), and its frequency stability has great influence on the positioning accuracy of the GNSS. Up to now the on-board atomic frequency standards used in the GNSS are the rubidium atomic frequency standard (RAFS), the passive hydrogen atomic frequency standard and the cesium beam frequency standard. The RAFS has always been the first choice for the GNSS satellites due to its small volume, low power consumption, high reliability and satisfactory performance. Motivated by the GNSS application, the performance of the RAFS has been largely improved in recent decades. The newly launched GPS IIF satellites used the so called ‘‘enhanced RAFS’’ produced by the PerkinElmer. The RAFS is of frequency stability better than 1 9 10-12/s1/2 [1], which is recognized as the best performance for the RAFS in the world. We have been engaged in developing high performance RAFS for a long time. The short-term frequency stability of our RAFS products was better than 3 9 10-12/s1/2 [2]. The frequency stability of the R
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