Generalization of spatially variant apodization to noninteger Nyquist sampling rates

Author

Smith, Brian Hendee

Author_Institution

ERIM Int. Inc., Ann Arbor, MI, USA

Volume

9

Issue

6

fYear

2000

fDate

6/1/2000 12:00:00 AM

Firstpage

1088

Lastpage

1093

Abstract

Spatially variant apodization (SVA) is reformulated for use on synthetic aperture radar imagery with an arbitrary sampling rate. The algorithm is implemented as a spatially varying three-point finite impulse response filter, and constraints on the filter parameters are developed from physically motivated concepts. By varying the parameters of the filter, the sidelobe energy is reduced with no effective loss of resolution. The procedure produces an output comparable to that of the integer Nyquist version of SVA, and effectively eliminates sidelobe artifacts with no loss of mainlobe resolution

Keywords

FIR filters; filtering theory; image sampling; parameter estimation; radar imaging; synthetic aperture radar; SAR imagery; SVA; algorithm; filter parameters; finite impulse response filter; mainlobe resolution; noninteger Nyquist sampling rates; sidelobe artifacts elimination; sidelobe energy; spatially variant apodization; spatially varying three-point FIR filter; synthetic aperture radar imagery; Apertures; Convolution; Energy resolution; Extrapolation; Finite impulse response filter; Frequency domain analysis; Image sampling; Radar scattering; Sampling methods; Spatial resolution;

fLanguage

English

Journal_Title

Image Processing, IEEE Transactions on

Publisher

ieee

ISSN

1057-7149

Type

jour

DOI

10.1109/83.846250

Filename

846250