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Hot and cold body reference noise generators from 0 to 40 GHzThis article describes the design, development, and analysis of exceptionally accurate radiometric noise generators from 0-40 GHz to serve as standard references. Size, weight, power, and reliability are optimized to meet the requirements of NASA air- and space-borne radiometers. The radiometric noise temperature of these noise generators is, unavoidably, calculated from measured values rather than measured directly. The absolute accuracy and stability are equal to or better than those of reliable standards available for comparison. A noise generator has been developed whose measurable properties (VSWR, line loss, thermometric temperatures) have been optimized in order to minimize the effects of the uncertainty in the calculated radiometric noise temperatures. Each measurable property is evaluated and analyzed to determine the effects of the uncertainty of the measured value. Unmeasurable properties (primarily temperature gradients) are analyzed, and reasonable precautions are designed into the noise generator to guarantee that the uncertainty of the value remains within tolerable limits.
Document ID
19740049976
Document Type
Reprint (Version printed in journal)
Authors
Hornbostel, D. H. (Cutler-Hammer, Inc. AIL Div., Deer Park, N.Y., United States)
Date Acquired
August 7, 2013
Publication Date
June 1, 1974
Publication Information
Publication: IEEE Transactions on Instrumentation and Measurement
Volume: IM-23
Subject Category
ELECTRONIC EQUIPMENT
Funding Number(s)
CONTRACT_GRANT: NAS9-12045
CONTRACT_GRANT: NAS9-11275
Distribution Limits
Public
Copyright
Other