Accession Number

ADA574097

Title

Joint Diagonalization Applied to the Detection and Discrimination of Unexploded Ordnance.

Publication Date

Aug 2012

Media Count

16p

Personal Author

B. E. Barrowes F. Shubitidze I. Shamatava J. P. Fernandez K. O'Neill

Abstract

Efforts to discriminate buried unexploded ordnance from harmless surrounding clutter are often hampered by the uncertainty in the number of buried targets that produce a given detected signal. We present a technique that helps determine that number with no need for data inversion. The procedure is based on the joint diagonalization of a set of multistatic response (MSR) matrices measured at different time gates by a timedomain electromagnetic induction sensor. In particular, we consider the Naval Research Laboratory's TimeDomain Electromagnetic Multisensor Towed Array Detection System (TEMTADS), which consists of a 55 square grid of concentric transmitter/receiver pairs. The diagonalization process itself generalizes one of the standard procedures for extracting the eigenvalues of a single matrix; in terms of execution time, it is comparable to diagonalizing the matrices one by one. We present the method, discuss and illustrate its mathematical basis and physical meaning, and apply it to several actual measurements carried out with TEMTADS at a test stand and in the field at the former Camp Butner in North Carolina. We find that each target in a measurement is associated with a set of nonzero timedependent MSR eigenvalues (usually three), which enables estimation of the number of targets interrogated. These eigenvalues have a characteristic shape as a function of time that does not change with the location and orientation of the target relative to the sensor. We justify analytically and empirically that symmetric targets have pairs of eigenvalues with constant ratios between them.

Keywords

Algorithms Buried objects Clutter Detection Detectors Discrimination Eigenvalues Electromagnetism Emi(Electromagnetic induction) Inversion Mathematics Matrices Multisensors Physical properties Ratios Symmetry Targets Time dependence Time domain Towed arrays Transmitter receivers Unexploded ammunition Uxo(Unexploded ordnance)


Source Agency

Non Paid ADAS

NTIS Subject Category

79A  Ammunition, Explosives, & Pyrotechnics

Corporate Author

Dartmouth Coll., Hanover, NH.

Document Type

Journal article

Title Note

Journal article.

NTIS Issue Number

1318

Contract Number

W911NF0810385
