History and Performance of FEI Space-Class Oscillators

M. Bloch, O. Mancini, and T. McClelland

Abstract:	An indispensable component of any space vehicle is the onboard master oscillator. The proper operation of the entire payload is dependent on the performance of the master oscillator or the onboard clock. Frequency Electronics, Inc. (FEI) has been a key supplier of highreliability oscillators for space applications since 1963, and in this paper we will present a short history of oscillators for space applications that include quartz-based oscillators, rubidiumbased oscillators, and integrated timing/frequency generating systems. We will also present achieved performance of key parameters such as aging, short-term stability, and low power consumption. Design considerations to mitigate the effects of natural radiation in the space environment will be discussed as well as strategies to minimize frequency drift to assure mission lifetimes of 20 years or more. Furthermore, to predict long-term frequency accuracy we will present data of unpowered oscillators that were manufactured between 1968 and 1985 for longterm space missions that have been recently powered-on and tested. The presented data will provide empirical evidence that may be used to estimate the performance of quartz-based and rubidium-based oscillators in space.
Published in:	Proceedings of the 40th Annual Precise Time and Time Interval Systems and Applications Meeting December 1 - 4, 2008 Hyatt Regency Reston Town Center Reston, Virginia
Pages:	29 - 50
Cite this article:	Bloch, M., Mancini, O., McClelland, T., "History and Performance of FEI Space-Class Oscillators," Proceedings of the 40th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, December 2008, pp. 29-50.
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