Journal
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
Volume 59, Issue 7, Pages 5665-5686Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TGRS.2020.3023472
Keywords
Azimuth; Synthetic aperture radar; Imaging; Radar imaging; Image resolution; Antennas; Spaceborne radar; Digital beamforming (DBF); high-resolution wide swath; radar; radar imaging; synthetic aperture radar (SAR) imaging modes; spaceborne radar; SAR
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In this article, a new SAR imaging mode based on multiple elevation beams and PRI variation is introduced for high-resolution wide-swath imaging. This mode efficiently utilizes illumination time and achieves good performance, making it suitable for spaceborne SAR systems.
In the context of spaceborne synthetic aperture radar (SAR) imaging, high resolution and wide swath are inherently conflicting requirements. These may, however, be simultaneously satisfied by advanced imaging modes with multichannel architectures in elevation and/or azimuth. This article elaborates on a new mode based on multiple elevation beams and a simple pulse repetition interval (PRI) variation scheme which allows high-resolution wide-swath imaging. It is shown to use the illumination time more efficiently than ScanSAR and yet to be simpler than staggered SAR. Good SAR imaging performance is achieved with a rather compact antenna design. The proposed imaging mode is suitable for spaceborne SAR systems with planar and reflector antennas. In order to improve the imaging performance, a reflector antenna architecture with a multichannel feed in both elevation and azimuth is considered.
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