Target prescreening based on a quadratic gamma discriminator

Author

Principe, Jose C. ; Radisavljevic, Alex ; Fisher, John, III ; Hiett, Margarita ; Novak, Leslie M.

Author_Institution

Dept. of Electr. & Comput. Eng., Florida Univ., Gainesville, FL, USA

Volume

34

Issue

3

fYear

1998

fDate

7/1/1998 12:00:00 AM

Firstpage

706

Lastpage

715

Abstract

This work presents the development, analysis and validation of a new target discrimination module for synthetic aperture radar (SAR) imagery based on an extension of gamma functions to 2-D. Using the two parameter constant false-alarm rate (CFAR) stencil as a prototype, a new stencil based on 2-D gamma functions is used to estimate the intensity of the pixel under test and its surroundings. A quadratic discriminant function is created from these estimates, which is optimally adapted with least squares in a training set of representative clutter and target chips. This discriminator is called the quadratic gamma discriminator (QGD). The combination of the CFAR and the QGD was tested in realistic SAR environments and the results show a large improvement of the false alarm rate with respect to the two-parameter CFAR, both with high resolution (1 ft) fully polarimetric SAR and with one polarization, 1 m SAR data

Keywords

IIR filters; adaptive filters; feature extraction; image classification; least squares approximations; radar clutter; radar computing; radar detection; radar imaging; radar polarimetry; radar target recognition; search radar; synthetic aperture radar; 2D extension of gamma functions; automatic target recognition; clutter; decision rule; high resolution fully polarimetric SAR; intensity estimation; least squares; pixel under test; quadratic discriminant function; quadratic gamma discriminator; synthetic aperture radar imagery; target discrimination module; target prescreening; two parameter constant false-alarm rate stencil; whitening filter; Clutter; Detectors; Filters; Image analysis; Laboratories; Least squares approximation; Prototypes; Synthetic aperture radar; Target recognition; Testing;

fLanguage

English

Journal_Title

Aerospace and Electronic Systems, IEEE Transactions on

Publisher

ieee

ISSN

0018-9251

Type

jour

DOI

10.1109/7.705880

Filename

705880