PERFORMANCE OF PREPRODUCTION MODEL CESIUM BEAM FREQUENCY STANDARDS FOR SPACECRAFT APPLICATIONS

Martin W. Levine

Abstract:	The first of a series of Preproduction Model (PPM) Cesium Beam Frequency Standards for spaceflight application on Navigation Development Satellites has been designed and fabricated and preliminary testing has been completed. The PPM is identical in form, fit and function, to the production cesium standards for the GPS NAVSTAR System. The PPM evolved from an earlier Prototype Model launched aboard NTS-2 (June, 1977) and the Engineering Development Model (EDM) to be launched aboard NTS satellites during 1979. A number of design innovations, including a hybrid analog/digital integrator and the replacement of analog filters and phase detectors by clocked digital sampling techniques will be discussed. Thermal and thermal-vacuum PPM testing has been concluded and test data will be presented. Stability data for 10 to 10 seconds averaging interval, measured under laboratory conditions, will also be shown.
Published in:	Proceedings of the 10th Annual Precise Time and Time Interval Systems and Applications Meeting November 28 - 30, 1978 Goddard Space Flight Center Greenbelt, Maryland
Pages:	169 - 193
Cite this article:	Levine, Martin W., "PERFORMANCE OF PREPRODUCTION MODEL CESIUM BEAM FREQUENCY STANDARDS FOR SPACECRAFT APPLICATIONS," Proceedings of the 10th Annual Precise Time and Time Interval Systems and Applications Meeting, Greenbelt, Maryland, November 1978, pp. 169-193.
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