Document Detail


Nanohertz frequency determination for the gravity probe B high frequency superconducting quantum interference device signal.
MedLine Citation:
PMID:  22225252     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
In this paper, we present a method to measure the frequency and the frequency change rate of a digital signal. This method consists of three consecutive algorithms: frequency interpolation, phase differencing, and a third algorithm specifically designed and tested by the authors. The succession of these three algorithms allowed a 5 parts in 10(10) resolution in frequency determination. The algorithm developed by the authors can be applied to a sampled scalar signal such that a model linking the harmonics of its main frequency to the underlying physical phenomenon is available. This method was developed in the framework of the gravity probe B (GP-B) mission. It was applied to the high frequency (HF) component of GP-B's superconducting quantum interference device signal, whose main frequency f(z) is close to the spin frequency of the gyroscopes used in the experiment. A 30 nHz resolution in signal frequency and a 0.1 pHz/s resolution in its decay rate were achieved out of a succession of 1.86 s-long stretches of signal sampled at 2200 Hz. This paper describes the underlying theory of the frequency measurement method as well as its application to GP-B's HF science signal.
Authors:
M Salomon; J W Conklin; J Kozaczuk; J E Berberian; G M Keiser; A S Silbergleit; P Worden; D I Santiago
Publication Detail:
Type:  JOURNAL ARTICLE    
Journal Detail:
Title:  The Review of scientific instruments     Volume:  82     ISSN:  1089-7623     ISO Abbreviation:  -     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2012-1-9     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0405571     Medline TA:  Rev Sci Instrum     Country:  -    
Other Details:
Languages:  ENG     Pagination:  125110     Citation Subset:  -    
Affiliation:
Department of Aeronautics Astronautics, Stanford University, Durand Building, 496 Lomita Mall, Stanford, California 94305-4035, USADepartment of Physics, University of California Santa Cruz, 211 Interdisciplinary Sciences Building, 1156 High Street, Santa Cruz, California 95064, USABerberian & Company, LLC, 3865 Wilson Blvd Ste 520, Arlington, Virginia 22203-1764, USAHansen Experimental Physics Laboratory, Stanford University, 452 Lomita Mall, Stanford, California 94305-4085, USABerberian & Company, LLC, P.O. Box 30407, Bethesda, Maryland 20824, USA.
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