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You searched on: Topic Area: Microwave Measurement Services Sorted by: date

Displaying records 21 to 29.
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21. Recommended Terminology For Microwave Radiometry
Series: Technical Note (NIST TN)
Topic: Microwave Measurement Services
Published: 8/1/2008
Authors: James Paul Randa, Janne Lahtinen, Adriano Camps, A. Gasiewski, Martti Hallikainen, David Leine V, Manuel Martin-Neira, Jeff Piepmeier, Philip Rosenkranz, Christopher Ruf, James Shiue, Niels Skou
Abstract: We present recommended definitions for common terms in microwave remote-sensing radiometry. Terms are grouped into three chapters: General Terminology, Real-Aperture Radiometers, and Polarimetric Radiometry. AN alphabetical index lists the terms t ...

Topic: Microwave Measurement Services
Published: 11/30/2007
Authors: James Paul Randa, Ken Wong, Roger Pollard
Abstract: Results are presented for simulations of a verification process for noise-parameter measurements. The verification process consists of first measuring separately both a passive device and the amplifier or transistor of interest (the DUT) and then mea ...

23. Radiometer Measurements of a Near-Ambient, Variable-Temperature Noise Standard
Topic: Microwave Measurement Services
Published: 6/7/2004
Authors: George Free, James Paul Randa, Robert L. Billinger
Abstract: A near-ambient, variable-temperature noise standard whose physical temperature can be accurately measured was constructed and then measured with the NIST total-power radiometer to test the accuracy of radiometer measurements in the temperature range ...

24. Simulations of Noise-Parameter Uncertainties
Topic: Microwave Measurement Services
Published: 6/7/2002
Author: James Paul Randa
Abstract: This paper reports results for uncertainties obtained using a Monte Carlo simulation of noise-parameter measurements. The simulator permits the computation of the dependence of the uncertainty in the noise parameters on uncertainties in the underlyin ...

25. Vector Corrected Noise Temperature Measurements
Topic: Microwave Measurement Services
Published: 6/7/2002
Authors: Mark H. Weatherspoon, Lawrence P. Dunleavy, Ali Boudiaf, James Paul Randa
Abstract: A new one-port noise temperature measurement technique is presented that uses receiver noise parameters for error correction. Improved accuracy in one-port noise temperature measurements made with commercial systems is demonstrated without using iso ...

26. NFRad: Review of the New NIST Noise Measurement System
Topic: Microwave Measurement Services
Published: 6/1/2000
Authors: Chriss A. Grosvenor, James Paul Randa, Robert L. Billinger

27. Noise-Source Stability Measurements
Topic: Microwave Measurement Services
Published: 5/1/2000
Authors: James Paul Randa, L. A. Terrell, Lawrence P. Dunleavy
Abstract: We report results of stability tests on several noise sources for selected frequencies between 12 and 26.5 GHz. Measurements covered intervals of about 1 week and about 1 year or more. Drifts in noise temperature were typically less than the uncert ...

28. Noise-Temperature Measurement System for the WR-28 Band
Series: Technical Note (NIST TN)
Report Number: 1395
Topic: Microwave Measurement Services
Published: 8/1/1997
Authors: James Paul Randa, L. A. Terrell
Abstract: The NIST Noise Project has constructed and tested a radiometer for the measurement of noise sources in the WR-28 waveguide band (26.5 GHz to 40 GHz). It is a total-power radiometer which incorporates a six-port reflectometer for the measurement of r ...

29. Amplifier Noise Measurements at NIST
Topic: Microwave Measurement Services
Published: 4/1/1997
Authors: D. F. Wait, James Paul Randa

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