Multichannel Full-Aperture Azimuth Processing for Beam Steering SAR

Terrain Observation by Progressive Scans (TOPS) synthetic aperture radar (SAR) and spotlight SAR are advanced SAR imaging modes for wide range swath and high resolution. In order to obtain a wider range coverage, azimuth multichannel is introduced in the literature. Since the azimuth bandwidth of be...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on geoscience and remote sensing 2013-09, Vol.51 (9), p.4761-4778
Main Authors: SUN, Guang-Cai, MENGDAO XING, XIA, Xiang-Gen, YUFENG WU, PINGPING HUANG, YIRONG WU, ZHENG BAO
Format: Article
Language:English
Subjects:
Algorithms
Applied geophysics
Azimuth
Bandwidth
Beam steering
Beam steering SAR (BS-SAR)
Compressing
Doppler effect
Earth sciences
Earth, ocean, space
Exact sciences and technology
Image resolution
Imaging
Internal geophysics
Multichannel
Signal reconstruction
sliding spotlight SAR
spotlight SAR
Studies
Synthetic aperture radar
synthetic aperture radar (SAR)
Terrain Observation by Progressive Scans (TOPS) SAR
Tops
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Terrain Observation by Progressive Scans (TOPS) synthetic aperture radar (SAR) and spotlight SAR are advanced SAR imaging modes for wide range swath and high resolution. In order to obtain a wider range coverage, azimuth multichannel is introduced in the literature. Since the azimuth bandwidth of beam steering SAR (BS-SAR; spotlight SAR, sliding spotlight SAR, or TOPS SAR) is much greater than that of a stripmap SAR, a signal reconstruction algorithm used for multichannel stripmap SAR may not be effective for multichannel BS-SAR. In this paper, a multichannel full-aperture azimuth processing algorithm is proposed for a BS-SAR. The key of this algorithm lies in the beam and the azimuth bandwidth compressions of multichannel signals in the Doppler-array and slow time-angle planes, respectively. Through compression processing, the beamwidth and the azimuth bandwidth are smaller than the available angle and equivalent pulse repeating frequency , respectively. Then, an improved post-Doppler STAP method is proposed to recover a 2-D spectrum. With the recovered signal, further processing can be utilized to focus the multichannel signal. Simulation and real data results show the effectiveness of the proposed algorithm.
ISSN:0196-2892
1558-0644
DOI:10.1109/TGRS.2012.2230267