Communications: directive radio wave systems and devices (e.g. – Synthetic aperture radar
Reexamination Certificate
2006-10-03
2006-10-03
Pihulic, Dan (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Synthetic aperture radar
C342S02500R, C342S090000, C342S195000
Reexamination Certificate
active
07116265
ABSTRACT:
A method for classification of a target object having a periphery comprises the steps of: selecting a plurality of random first chords D1across the periphery of the target object;measuring each of the first chords D1to obtain a plurality of first dimensions;computing for each of the first chords D1a second chord D2across the periphery thus forming a plurality of D1, D2pairs of chords;measuring the second chords D2for all pairs to obtain second dimensions;computing for each of the pairs of first chords D1and second chords D2the ratio D1/D2of the first dimension to the second dimension to obtain a plurality of first values;computing the logarithm of the first values to obtain a plurality of logarithmic values;computing difference values by subtracting the second dimension from the first dimension for each of the pairs;recording the first values, logarithmic values and difference values in histograms;extracting a vertex lists from the histograms;combining one or more of the vertex lists to obtain a signature indicative of the classification of the object target.For each of the pairs, the second chords are orthogonal to the first chords, and the second chords share a point with the first chords and the periphery.
REFERENCES:
patent: 6259396 (2001-07-01), Pham et al.
patent: 7015855 (2006-03-01), Medl et al.
Daniell Cynthia E.
Shu David B.
ALkov Leonard A.
Pihulic Dan
Raytheon Company
Vick Karl A.
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