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Improved Measurement of Coherence in Presence of Instrument NoiseA method for correcting measured coherence spectra for the effect of incoherent instrument noise has been developed and demonstrated. Coherence measurements are widely used in engineering and science to determine the extent to which two signals are alike. The signals may come from two different sources or from the same source at different times. The coherence of time-lagged signals from a single source is an excellent indication of the effective lifetime of the signal components as a function of their frequency. Unfortunately, incoherent instrument noise will bias the measurement to lower values and may lead the user of the data to false conclusions about the longevity of significant features. The new method may be used whenever both the signal and noise power spectra are known and the noise is incoherent both with the signal and with itself at the applicable time delays. It provides a corrected coherence spectrum given the measured coherence and power spectra. For powerlaw signal spectra and instrumental white noise, the correction formula takes a particularly simple and explicit form. Since many geophysical signals exhibit powerlaw behavior and most instrument noise spectra approach white noise, the simplified form should be widely applicable in meteorology, oceanography, geology, and planetary geophysics.
Document ID
20110023594
Acquisition Source
Kennedy Space Center
Document Type
Other - NASA Tech Brief
Authors
Merceret, Francis J.
(NASA Kennedy Space Center Cocoa Beach, FL, United States)
Date Acquired
August 25, 2013
Publication Date
February 1, 2003
Publication Information
Publication: NASA Tech Briefs, February 2003
Subject Category
Man/System Technology And Life Support
Report/Patent Number
KSC-12267
Distribution Limits
Public
Copyright
Public Use Permitted.
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