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Author: dylan williams

Displaying records 31 to 40 of 155 records.
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31. Compensation of Random and Systematic Timing Errors in Sampling Oscilloscopes
Published: 12/1/2006
Authors: Paul D Hale, C. M. Wang, Dylan F Williams, Catherine A Remley, Joshua Wepman
Abstract: In this paper, a method of correcting both random and systematic timebase errors using measurements of only two quadrature sinusoids made simultaneously with a waveform of interest is described. The authors estimate the fundamental limits to the proc ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31702

32. Terminology for High-Speed Sampling-Oscilloscope Calibration
Published: 12/1/2006
Authors: Dylan F Williams, Tracy S. Clement, Paul D Hale, Andrew Dienstfrey
Abstract: We discuss procedures for calibrating high-speed sampling oscilloscopes at the National Institute of Standards and Technology, and the terminology associated with those calibrations. The discussion clarifies not only the calibration procedures, but h ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32316

33. Shielding And Attenuation Properties of Large Buildings and Structures
Published: 9/4/2006
Authors: Christopher L Holloway, Galen H Koepke, Dennis G Camell, Catherine A Remley, S. A. Schima, Dylan F Williams
Abstract: For various applications, there is a growing need to understand the shielding and/or attenuation properties of large buildings and structures. In this paper, we present experimental data for the coupling of electromagnetic fields into various types o ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32311

34. Minimum-Phase Calibration of Sampling Oscilloscopes
Published: 8/15/2006
Authors: Andrew M Dienstfrey, Paul D Hale, Darryl A. Keenan, Tracy S. Clement, Dylan F Williams
Abstract: We describe an algorithm for determining the minimum phase of a linear time-invariant response function from its magnitude. The procedure is based on Kramers Kronig relations in combination with auxiliary direct measurements of the desired phase resp ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901517

35. Calibration of Sampling Oscilloscopes With High-Speed Photodiodes
Published: 8/1/2006
Authors: Tracy S. Clement, Paul D Hale, Dylan F Williams, C. M. Wang, Andrew Dienstfrey, Darryl A. Keenan
Abstract: We calibrate the magnitude and phase response of equivalent-time sampling oscilloscopes to 110 GHz. We use a photodiode that has been calibrated with our electrooptic sampling system as a reference input pulse source to the sampling oscilloscope. We ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32157

36. Minimum-phase calibration of sampling oscilloscopes
Published: 8/1/2006
Authors: Andrew Dienstfrey, Paul D Hale, Darryl A. Keenan, Tracy S. Clement, Dylan F Williams
Abstract: We describe an algorithm for determining the minimum phase of a linear, time-invariant response function from its magnitude. The procedure is based on Kramers-Kronig relations in combination with auxiliary direct measurements of the desired phase res ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32162

37. Firefighter Radio Communications in Large Public Buildings: Comparing Analog and Digital Modulation
Published: 3/7/2006
Authors: Catherine A Remley, Marc Rutschlin, Dylan F Williams, Robert T. Johnk, Galen H Koepke, Christopher L Holloway, Mike G Worrell, Andy MacFarlane
Abstract: To assess in-building radio coverage, in 2004 the City of Phoenix Fire Department carried out extensive testing of their radio systems. They deployed firefighters in standard configurations in a variety of buildings, and rated on a scale of 1 to 5 th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32184

38. Microwave-Mixer Measurement with a Sampling Oscilloscope
Published: 3/1/2006
Authors: Dylan F Williams, Hassen Khenissi, Fabien Ndagijimana, Catherine A Remley, Joel Dunsmore, Paul D Hale, Jack Wang, Tracy S. Clement
Abstract: We describe a straightforward method of separately characterizing up-conversion and down-conversion in microwave mixers with a sampling oscilloscope. The method mismatch-corrects the results, determines both magnitude and phase, and uses a novel time ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31966

39. Covariance-Based Uncertainty Analysis of the NIST Electro-optic Sampling System
Published: 1/1/2006
Authors: Dylan F Williams, Arkadiusz C. (Arkadiusz) Lewandowski, Tracy S. Clement, C. M. Wang, Paul D Hale, Juanita M. Morgan, Darryl A. Keenan, Andrew Dienstfrey
Abstract: We develop a covariance matrix describing the uncertainty of mismatch-corrected measurements performed on the National Institute of Standards and Technology's electro-optic sampling system. This description offers a general way of describing the unce ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31986

40. Propagation and Detection of Radio Signals Before, During and After the Implosion of a Large Sports Stadium (Veteran's Stadium in Philadelphia)
Series: Technical Note (NIST TN)
Report Number: 1541
Published: 10/1/2005
Authors: Christopher L Holloway, Galen H Koepke, Dennis G Camell, Catherine A Remley, Dylan F Williams, Susan Schima, Seturnino Canales
Abstract: In this report, we investigate radio communications problems faced by emergency responders (firefighters and police) in disaster situation such as collapsed buildings. A fundamental challenge to communications into and out of large buildings is the s ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32097



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