Consider a signal generator whose instantaneous time averages implied in the definitions are normally not available; output voltage V(t) may be written as thus estimates for the two measures must be used. Estimates of
This paper reviews hydrogen standard work at GSFC during the past two years (January 1966 to April 1968. Research and development has been directed primarily toward the realization of field operable time and frequency standards based upon the atomic hydrogen maser. As a result, several improvements have been made in the performance characteristics, while the design simplicity, maintenance free life, and other features have been enhanced. Particular areas covered include experiments with thermal control, design of a large storage bulb -high line Q maser using an all metal cavity, more efficient state selection, improved RF dissociator design, and a new digital automatic cavity tuning system which requires only a good quartz crystal as the reference oscillator. A second hydrogen maser has been required for this purpose in the past. Prototype standards a r e under construction which embody the features described.
GOES-8 was launched 4/13/94. This first body stabilized U. S. operational geosynchronous satellite provides a much more flexible observing platform than the earlier spinning spacecraft. As such it carries 2 major instruments, a 132 kg, five band imager and a 120 kg, 19 band atmospheric sounder as well as several secondary payloads. Studies are ongoing to lay the foundation for the architecture of the next generation, the GOES-N system. A review of the GOES developmental lustory, the plan for GOES-N system requirements development, and some key questions €or this system to be operational in the 2008 time frame are presented.
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