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Search Publications by: David A. Howe (Assoc)

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Displaying 201 - 225 of 246

Wide-Range Microwave Frequency Synthesis Using An Offset Passive Resonator

January 1, 2002
Author(s)
David A. Howe, Archita Hati, Craig W. Nelson, F L. Walls, J F. Garcia nava, A Sen Gupta
We demonstrate a technique to obtain wide synthesized tunability from the local oscillator (LO) of a low-noise, fixed-frequency microwave reference whose noise is suppressed by a high-Q cavity discriminator operated in a passive mode. The results show that

Total Hadamard Variance: Application to Clock Steering by Kalman Filtering

March 1, 2001
Author(s)
David A. Howe, Ron Beard, Chuck Greenhall, Francois Vernotte, Bill Riley
The Total variance approach has been developed for increasing the confidence of the estimation of the classical Allan variance, particularly for large integration times. This method is based on a procedure involving extension of the original data. Recently

Definitions of Total Estimators of Common Time-Domain Variances

January 1, 2001
Author(s)
David A. Howe, Trudi K. Peppler
This paper summarizes the definitions and properties of frequency and time variance estimators based on the "total" approach. These definitions and properties are not available in one document, yet this statistical approach produces variance estimates with

Microwave Synthesizers for Atomic Frequency Standards

January 1, 2001
Author(s)
A Sen gupta, F Garcia nava, Craig Nelson, David A. Howe, F L. Walls
Following our earlier work on a new approach to synthesising the Cs hyperfine frequency of 9.192 GHz, we describe developments on its further refinements. The salient feature of our design is that it is based mainly on frequency division and requires no

Total Variance, an Estimator of Long-Term Frequency Stability

September 5, 1999
Author(s)
Chuck Greenhall, David A. Howe, Donald B. Percival
Total variance is a statistical tool developed for improved estimates of frequency stability at averaging times up to one-half the test duration. As a descriptive statistic, total variance performs an exact decomposition of the sample variance of the