Development of New-Generation Space-Borne Rubidium Clock
Beijing Institute of Radio Metrology and Measurement began to develop space-borne rubidium clocks from 2000. As one of the manufacturers of space-borne rubidium clocks, the institute had delivered more than 10 products to a satellite system of China until
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Development of New-Generation Space-Borne Rubidium Clock Chunjing Li, Tongmin Yang, Liang Zhai and Li Ma
Abstract Beijing Institute of Radio Metrology and Measurement began to develop space-borne rubidium clocks from 2000. As one of the manufacturers of space-borne rubidium clocks, the institute had delivered more than 10 products to a satellite system of China until 2011, greatly supporting the construction of the satellite system. This paper summarizes the design features and performances of its previous products. The institute started to develop the new-generation spaceborne rubidium clock in 2011. By using a series of new techniques, a prototype has been built. Compared to the previous products, the performance of the prototype is greatly improved. This paper also discusses the main differences between the previous and current products, both in design and in performance. Keywords Space rubidium clock
New generation Prototype
35.1 Background Beijing Institute of Radio Metrology and Measurement began to develop spaceborne rubidium clocks from 2000. Our work includes the design of the whole clock and the circuit system, the physics package, is supplied by another domestic unit. We have produced space-borne rubidium atomic clocks, and the products have been applied to more than 10 satellites. Recently, based on our previous experience, we are developing a new-generation space-borne rubidium clock, aiming at improving the key performances of our products.
C. Li (&) T. Yang L. Zhai L. Ma Beijing Institute of Radio Metrology and Measurement, Beijing, China e-mail: [email protected]
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_35, Springer-Verlag Berlin Heidelberg 2013
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35.2 Technical Features of Existing Space-Borne Rubidium Clock Our previous product is a 10 MHz output rubidium clock, see Fig. 35.1. Only one 10 MHz OCXO is employed inside the whole rubidium clock. The 10 MHz signal is sent to a RF low-order frequency multiplier with 135 Hz modulation for 99 frequency multiplication to obtain a 90 MHz signal. Then the signal is frequency multiplied by a 769 high-order frequency multiplier, and synthesized with the 5.3125 MHz signal generated by the frequency synthesizer to produce a 6,834.6875 MHz signal required for the physics package. The output discriminator signal of the physics package is then subject to AC amplification, synchronous detection and integral amplification, and is finally sent to the voltage control terminal of the OCXO, so as to lock the 10 MHz frequency of the OCXO to the transition frequency of rubidium atoms. This design scheme is mature and reliable, in which the localization rate of parts and components reaches 100 %. The advantages and disadvantages of the design are as follows. • The typical integrated filter mode was used. This design is simple and reliable, but has a large microwave power frequency drift. • A nonlinear transistor fre
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