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Topic Area: Time and Frequency

Displaying records 31 to 40 of 60 records.
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31. High Spectral purity oscillator at 40 GHz: Design using air-dielectric Cavity
Topic: Time and Frequency
Published: 6/2/2010
Authors: Archita Hati, Craig W Nelson, Billy F Riddle, David Allan Howe
Abstract: We describe the design of a low-PM noise 40 GHz oscillator that uses a conventional air-dielectric cavity resonator as a frequency discriminator to clean up the PM noise of a commercial 10 GHz dielectric resonator oscillator (DRO) multiplied by four. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906039

32. Low-Frequency Characterization of MEMS-Based Portable Atomic Magnetometer
Topic: Time and Frequency
Published: 6/2/2010
Authors: Rahul R. (Rahul) Mhaskar, Svenja A Knappe, John E Kitching
Abstract: Atomic magnetometers based on absorption or polarization rotation of light in an alkali vapor have recently demonstrated sensitivities rivaling those of superconducting quantum interference devices (SQUIDs). Miniaturization of such devices containing ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906104

33. Medium-Term Frequency Stability of Hydrogen Masers as Measured by a Cesium Fountain
Topic: Time and Frequency
Published: 6/2/2010
Authors: Thomas Edward Parker, Steven R Jefferts, Thomas Patrick Heavner
Abstract: Abstract Hydrogen masers are used extensively in time scale ensembles, but the frequency drift must be accurately known. NIST-F1, the cesium fountain primary frequency standard at the National Institute of Standards and Technology, now operates nearl ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906021

34. Phase noise suppression in frequency comb generators
Topic: Time and Frequency
Published: 6/2/2010
Authors: Craig W Nelson, Archita Hati, J F Nava-garcia, David Allan Howe
Abstract: We propose an idea to suppress the flicker (1/f) noise in radio frequency (RF) multiplier based frequency comb generators. Comb generators are often used for frequency multiplication in frequency synthesis. In general, comb generators apply high powe ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905992

35. A common-view disciplined oscillator
Topic: Time and Frequency
Published: 5/24/2010
Authors: Michael A Lombardi, Aaron P Dahlen
Abstract: This paper describes a common-view disciplined oscillator (CVDO) that locks to a reference time scale through the use of common-view Global Positioning System (GPS) satellite measurements. A Proportional-Integral-Derivative (PID) controller obtains ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904996

36. How Accurate is a Radio Controlled Clock?
Topic: Time and Frequency
Published: 3/1/2010
Author: Michael A Lombardi
Abstract: This paper discusses the factors that determine the accuracy of radio controlled clocks. The topics covered including the accuracy of the time signal station, path delay, synchronization errors, and the time error that accumulates between synchroniz ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903949

37. NIST Time and Frequency Bulletin
Series: NIST Interagency/Internal Report (NISTIR)
Topic: Time and Frequency
Published: 1/5/2010
Author: Eyvon Petty
Abstract: The Time and Frequency Bulletin provides information on performance of time scales and a variety of broadcasts (and related information) to users of the NIST services)
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904643

38. Distributing UTC(NIST) to Industrial Time and Frequency Users
Topic: Time and Frequency
Published: 11/18/2009
Authors: Michael A Lombardi, Victor Shufang Zhang
Abstract: The National Institute of Standards and Technology (NIST) maintains one of the world s most accurate and stable time scales, UTC(NIST), as well as the NIST-F1 cesium fountain, the primary frequency standard for the United States. These standards are ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903883

39. Limits on GPS Carrier Phase Time Transfer
Topic: Time and Frequency
Published: 11/16/2009
Author: Marc A Weiss
Abstract: The stability of differential delays between Global Navigation Satellite receivers is critical for time and frequency transfer. We study the limit of this transfer between two specific receivers from the study of data taken from these receivers whil ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904263

40. Novel, All-Digital Phase Measurement System for Time Scales
Topic: Time and Frequency
Published: 11/16/2009
Authors: Stefania Romisch, Thomas Edward Parker, Steven R Jefferts
Abstract: A novel, all-digital phase measurement system, to be utilized as part of the NIST Time Scale at NIST in Boulder, CO is presented. The system is used to compare output signals from several commercial atomic frequency standards: the phase differences ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904665



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