Fast envelope correlation for passive ranging.
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Authors
Mika, Frank J.
Subjects
fourier transform
correlation
frequency analysis
signal processing
correlation
frequency analysis
signal processing
Advisors
Hippenstiel, Ralph D.
Date of Issue
1991-09
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
Application of classic triangulation methods will allow
the location of a radar to be determined by passive sensors.
Through the use of modern digital signal processing techniques
this estimate can be made in a simpler fashion using a
conventional receiver. In this thesis a technique is developed for time
difference of arrival (TDOA) estimation using a frequency
domain based correlation detector driven by an envelope
detector. Time lag boundaries are defined on the output of the
correlator. A fixed detection threshold is calculated to
permit constant false alarm rate (CFAR) detection. The
performance of the correlation detector is plotted as a
receiver operating characteristic (ROC) curve as a function of
signal to noise ratio (SNR) . An interactive MATLAB software
program is provided to perform either spectral domain or time
domain based correlation. Spectral domain based correlation uses the Fast Fourier
Transform (FFT) . Implicit with the use of the FFT are finite
arithmetic internal processing errors which are modeled as
independent uncorrelated noise sources. A method is presented
to account for SNR degradation at the output of the FFT.
Type
Thesis
Description
Series/Report No
Department
Electrical Engineering
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funder
Format
104 p.;28 cm.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.