An investigation of a method for obtaining a numerical indicator of phase coherence
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Authors
Beal, Robert Everett
Subjects
Fast Fourier Transform
Signal Processing
Phase Coherence
Amplitude Dependence
Normalization
Spectrum
Modified Fast Fourier Transform
Signal Processing
Phase Coherence
Amplitude Dependence
Normalization
Spectrum
Modified Fast Fourier Transform
Advisors
Rahe, G.A.
Date of Issue
1974-06
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The Fast Fourier Transform (FFT) has dramatically changed
the signal processing field by allowing the transformation
of data from the time domain to the frequency domain at
speeds rivaling and in many cases exceeding real time. The
output spectrum obtained from the FFT depends on the amplitudes
and the phase coherence of the sinusoids that comprise
the input waveform. It is the purpose of this investigation
to modify the FFT so that it will rely more heavily on the
phase coherence of these sinusoids rather than on their amplitude.
In this way a second indicator of signal presence
or absence would be available to add more reliability to the
estimation process. The study proposes a method for reducing
the dependence of the output coefficients on input amplitudes
and investigates its merits with several types of data.
A method of displaying the phase coherence indicators is
presented.
Type
Thesis
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Distribution Statement
Approved for public release; distribution is unlimited.