Investigations into the Rb Clock’s 2nd Harmonic Signal: A Status Report

Gilda Fathi and James Camparo

Abstract:	As commercial and military systems become ever more dependent on GNSS, it becomes vitally important to ensure the health of the system’s spacecraft atomic clocks. Though a number of methodologies for monitoring clock integrity are now under study/discussion, all have particular strengths and weaknesses; no one methodology achieves the ideal. More than likely, future GNSS will ensure clock integrity through a hybrid of techniques, and one component of that hybrid will certainly focus on the clock’s status-of-health monitors: rf-signal level, lock-monitor voltage (and for Rb clocks) cell temperature, lamp monitor voltage, and 2nd harmonic signal level. In the present work, we detail our preliminary investigations into the parameters that affect the 2nd harmonic signal.
Published in:	Proceedings of the 41st Annual Precise Time and Time Interval Systems and Applications Meeting November 16 - 19, 2009 Hyatt Regency Tamaya Resort Santa Ana Pueblo, New Mexico
Pages:	473 - 480
Cite this article:	Fathi, Gilda, Camparo, James, "Investigations into the Rb Clock’s 2nd Harmonic Signal: A Status Report," Proceedings of the 41st Annual Precise Time and Time Interval Systems and Applications Meeting, Santa Ana Pueblo, New Mexico, November 2009, pp. 473-480.
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