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Patent Number: |
7440989 |
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Case ID: |
0 |
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Patent Title:
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Kernel function approximation and receiver
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Status: |
ACTIVE |
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Status Date: |
2/3/2010 10:51:53 AM |
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Issue Date:
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10/21/2008 |
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Filed Date:
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4/2/2004 |
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Serial #:
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0/816,353 |
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Assignee Name:
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The United States of America as represented by the Secretary of the Air Force
(Washington,
DC)
N/A
(
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Inventor(s):
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Tsui, James B. Y. , Emmert, John M. , Hary, Stephen L. , Lin, David M. , Pequignot, Nicholas A. , Graves, Keith M. |
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A Fourier transformation arrangement usable in an electronic warfare radio
receiver for analyzing spectral content of multiple transmitter-sourced
brief duration incoming signals for their signal characteristics. The
disclosed Fourier transformation arrangement includes approximated Kernel
function values disposed in a significant plurality of locations about a
real-imaginary coordinate axis origin according to disclosed locating
principles. The points are displaced from the origin by magnitudes having
real and imaginary component lengths of powers of two commencing with
zero. Multiplication involving a power of two component length during a
Kernel function utilization are preferably achieved by way of an expanded
binary shift multiplication algorithm in lieu of a full fledged digital
multiplication algorithm. A group of guiding principles for selecting
desirable approximation Kernel function locations is included.
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We claim:
1. The limited mechanization complexity method of analyzing input radio frequency signals in a radio receiver, said method comprising the steps of: generating an approximated Kernel
function Fourier transformation of successive segments of said radio receiver input radio frequency signals; said approximated Kernel function Fourier transformation segments including individual Fourier series terms having real magnitude and imaginary
magnitude coefficients generated by multiplication of said radio frequency radio receiver input signal determined coefficients by selected approximated Fourier transformation Kernel function coefficients; said selected approximated Kernel function
Fourier transformation coefficients including both integral unit and integral multiple unit possible component magnitudes lying within and external of a Kernel function circle over a real and imaginary value complex plane grid containing said magnitude
circle Kernel function location pattern ove . . . . More |
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