Fourier analysis of broadband, low-level signals using switched inputs.
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Authors
Howarth, Gary L.
Subjects
FFT application
Fourier analyzer
signal detection system
spectral estimator
Fourier analyzer
signal detection system
spectral estimator
Advisors
Myers, Glen A.
Date of Issue
1981
Date
June 1981
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
A new technique for estimation of the spectrum of an
unknown signal is investigated. The technique combines a
radiometric method of signal detection (modulating the receiver
noise with the assumed signal by alternately connecting
and disconnecting the input transducer) with a Fast
Fourier Transform processor for spectral analysis. After
obtaining averaged spectral estimates with the transducer
(antenna) connected and disconnected the difference is formed
and statistical analyses applied to determine statistically
significant terms. The significant components comprise the
estimate of the spectrum of the signal.
Analytical results are derived for sinusoidal signals and
uncorrelated, Gaussian noise. Experimental results for both
narrow and wideband signals and additive Gaussian noise are
presented. Reasonable spectral estimates of a wideband signal
are obtained with 16 averages when the composite signal-to-noise
ratio is 0 dB.
Type
Thesis
Description
Series/Report No
Department
Electrical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.