An Impulse Response Function for Evaluation of UWB SAR Imaging
| Document type: | Journal Articles |
|---|---|
| Article type: | Original article |
| Peer reviewed: | Yes |
| Full text: | |
| Author(s): | Viet Thuy Vu, Thomas Sjögren, Mats Pettersson, Hans Hellsten |
| Title: | An Impulse Response Function for Evaluation of UWB SAR Imaging |
| Journal: | IEEE Transactions on Signal Processing |
| Year: | 2010 |
| Volume: | 58 |
| Issue: | 7 |
| Pagination: | 3927-3932 |
| ISSN: | 1053-587X |
| Publisher: | IEEE |
| URI/DOI: | 10.1109/TSP.2010.2047503 |
| ISI number: | 000278813600046 |
| Organization: | Blekinge Institute of Technology |
| Department: | School of Engineering - Dept. of Electrical Engineering (Sektionen för ingenjörsvetenskap - Avd. för elektroteknik) School of Engineering S-371 79 Karlskrona +46 455 38 50 00 http://www.bth.se/ing/ |
| Authors e-mail: | viet.thuy.vu@bth.se, thomas.sjogren@bth.se, mats.pettersson@bth.se, hans.hellsten@saabgroup.com |
| Language: | English |
| 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. |
| Subject: | Signal Processing\Radar and Sonar Signal Processing\General Mathematics\General |
| Keywords: | Impulse response function in SAR imaging (IRF-SAR), impulse response function in UWB SAR imaging (IRF-USAR), synthetic aperture radar (SAR), Sinc, ultrawideband-ultrawidebeam (UWB). |
