On Synthetic Aperture Radar Spatial Azimuth and Range Resolution Equations

Document type: Journal Articles
Article type: Original article
Peer reviewed: Yes
Full text:
Author(s): Viet Thuy Vu, Thomas Sjögren, Mats Pettersson
Title: On Synthetic Aperture Radar Spatial Azimuth and Range Resolution Equations
Journal: IEEE transactions on aerospace and electronic systems
Year: 2012
Volume: 48
Issue: 2
Pagination: 1764 - 1769
ISSN: 0018-9251
Publisher: IEEE
URI/DOI: 10.1109/TAES.2012.6178096
ISI number: 000302647400058
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
Authors e-mail: viet.thuy.vu@bth.se
Language: English
Abstract: This paper discusses spatial resolutions for narrowband narrowbeam (NB) synthetic aperture radar (SAR) as well as for ultrawideband ultrawidebeam (UWB) SAR. The similarity and difference between the impulse response function in NB SAR imaging (IRF-NSAR) - sinc function - and the impulse response function in UWB SAR imaging (IRF-USAR) is investigated and the result of this investigation shows that in the intensity interval from −6 dB to 0 dB, the behavior of IRF-NSAR and IRF-USAR in azimuth and range are similar. This is the basis for a derivation of new spatial resolution equations for UWB SAR based on −3 dB width or half power beamwidth (HPBW). The investigated result also shows that there exists the so-called HPBW narrowing/broadening factor in an IRF-USAR.
Subject: Signal Processing\Radar and Sonar
Signal processing\Image and Video Processing
Mathematics\Discrete Mathematics
Keywords: Synthetic aperture radar (SAR), resolution, impulse response function in SAR imaging (IRF-SAR), ultrawideband ultrawidebeam (UWB), narrowband narrowbeam (NB)