An Impulse Response Function for Evaluation of UWB SAR Imaging

Author

Vu, Viet T. ; Sjögren, Thomas K. ; Pettersson, Mats I. ; Hellsten, Hans

Author_Institution

Blekinge Inst. of Technol., Ronneby, Sweden

Volume

58

Issue

7

fYear

2010

fDate

7/1/2010 12:00:00 AM

Firstpage

3927

Lastpage

3932

Abstract

Based on analysis of a point target imaged by different synthetic aperture radar (SAR) systems, the commonly used impulse response function in SAR Imaging (IRF-SAR)-a two-dimensional (2-D) sinc function-is shown to be inappropriate for ultrawideband-ultrawidebeam (UWB) SAR systems utilizing a large fractional signal bandwidth and a wide antenna beamwidth. As a consequence, the applications of the 2-D sinc function such as image quality measurements and spatial resolution estimations are limited to narrowband-narrowbeam (NB) SAR systems exploiting a small fractional signal bandwidth and a narrow antenna beamwidth. In this paper, a more general IRF-SAR, which aims at UWB SAR systems, is derived with an assumption of flat two-dimensional (2-D) Fourier transform (FT) of a SAR image and called IRF-USAR. However, the derived IRF-USAR is also valid for NB SAR systems.

Keywords

object detection; radar imaging; synthetic aperture radar; transient response; ultra wideband radar; IRF-SAR; UWB SAR imaging; image quality measurement; impulse response function; narrowband-narrowbeam SAR systems; point target; spatial resolution estimation; two-dimensional sine function; Impulse response function in SAR imaging (IRF-SAR); Sinc; impulse response function in UWB SAR imaging (IRF-USAR); synthetic aperture radar (SAR); ultrawideband-ultrawidebeam (UWB);

fLanguage

English

Journal_Title

Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1053-587X

Type

jour

DOI

10.1109/TSP.2010.2047503

Filename

5443557