Title: Classification of subsurface objects using singular values derived from signal frames

Abstract

The classification system represents a detected object with a feature vector derived from the return signals acquired by an array of N transceivers operating in multistatic mode. The classification system generates the feature vector by transforming the real-valued return signals into complex-valued spectra, using, for example, a Fast Fourier Transform. The classification system then generates a feature vector of singular values for each user-designated spectral sub-band by applying a singular value decomposition (SVD) to the N.times.N square complex-valued matrix formed from sub-band samples associated with all possible transmitter-receiver pairs. The resulting feature vector of singular values may be transformed into a feature vector of singular value likelihoods and then subjected to a multi-category linear or neural network classifier for object classification.

Inventors:

Chambers, David H; Paglieroni, David W

Issue Date:

2014-05-06

Research Org.:

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1130522

Patent Number(s):

8717223

Application Number:

13/219,435

Assignee:

Lawrence Livermore National Security, LLC (Livermore, CA)

Patent Classifications (CPCs):

G - PHYSICS G01 - MEASURING G01S - RADIO DIRECTION-FINDING

G - PHYSICS G01 - MEASURING G01V - GEOPHYSICS

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G - PHYSICS G01 - MEASURING G01S - RADIO DIRECTION-FINDING

G01S13/003 - {Bistatic radar systems
G01S13/885 - {for ground probing
G01S13/90 - using synthetic aperture techniques {, e.g. synthetic aperture radar [SAR] techniques}

G - PHYSICS G01 - MEASURING G01V - GEOPHYSICS

G01V3/12 - operating with electromagnetic waves {
G01V3/15 - specially adapted for use during transport, e.g. by a person, vehicle or boat

G - PHYSICS G06 - COMPUTING G06N - COMPUTER SYSTEMS BASED ON SPECIFIC COMPUTATIONAL MODELS

G06N99/00 - Subject matter not provided for in other groups of this subclass

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DOE Contract Number:  

AC52-07NA27344

Resource Type:

Patent

Country of Publication:

United States

Language:

English

Subject:

97 MATHEMATICS AND COMPUTING