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- W865177026 abstract "Reductionism and holism are two worldviews that underlie the fields of linear andnonlinear signal processing, respectively. In the reductionist worldview, deviation fromlinearity is seen as a noise that warrants removal. In the holistic worldview, thesystem is viewed as a whole that cannot be fully understood solely in terms of itsconstituent parts. Conventional radar resolution theory is a direct application of thereductionist view. Consequently, analysis of single-channel synthetic aperture radarimagery for automatic target recognition (SAR-ATR) has traditionally been basedon linear techniques associated with the image intensity while the phase content isignored. The insufficiency of the linear system theory to extended targets has beenempirically observed in the literature.This thesis consists of a development of novel tools that exploit the nonlinear phenomenonin focused single-channel SAR imagery and application of these tools to theSAR-ATR problem. A systematic procedure to infer the statistical significance of thenonlinear dynamics is introduced. Furthermore, two novel frameworks for feature extractionfrom complex-valued SAR imagery are presented. The first framework is solelybased on the often ignored phase content, and it is built on techniques from the fieldsof complex-valued and directional statistics. The second framework utilizes complexvaluedSAR imagery and provides for exploiting nonlinear and nonstationary signalanalysis methods based on the Poincare and Hilbert views for nonlinear phenomena.Using real-world SAR datasets, the overall results confirm the statistical significance ofthe nonlinear effect for the case of extended targets. Furthermore, when the complexvaluedSAR image is detected, the nonlinear dynamics are found to be obliterated orgreatly altered. The efficacy of the frameworks developed is clearly demonstrated." @default.
- W865177026 created "2016-06-24" @default.
- W865177026 creator A5049905524 @default.
- W865177026 date "2015-01-01" @default.
- W865177026 modified "2023-09-24" @default.
- W865177026 title "Holism for target recognition in synthetic aperture radar imagery" @default.
- W865177026 hasPublicationYear "2015" @default.
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