Scanning Spaceborne Synthetic Aperture Radar with Integrated Radiometer

“…ScanSAR is a particular Synthetic Aperture Radar (SAR) that achieves very wide swath coverage by periodically switching the antenna pointing in several range "subswaths" [1,2]. This unique feature makes ScanSAR a very useful mode, causing it to be included in most recent and forthcoming spaceborne SARs (SRTM, RADARSAT, ASAR).…”

Section: Introductionmentioning

confidence: 99%

Optimal "focusing" for low resolution ScanSAR

Guarnieri

Guccione

2001

IEEE Trans. Geosci. Remote Sensing

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“…The Spaceborne Synthetic Aperture Radar (SAR) has dozens of operation modes, such as the stripmap mode, ScanSAR mode, TOPS mode, spotlight mode and the sliding spotlight mode, to image regions of interest (ROI) with variant combination of resolutions and swaths [1][2][3][4][5][6][7][8]. Despite the differences of these modes, they have one thing in common: their Beam Illumination Strip (BIS) (except for the spotlight mode) are all along the satellite ground-track direction [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

A Novel Spaceborne Sliding Spotlight Range Sweep Synthetic Aperture Radar: System and Imaging

Wang

Yang

et al. 2017

Remote Sensing

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Abstract:In this paper, a new Spaceborne Sliding Spotlight Range Sweep Synthetic Aperture Radar (SSS-RSSAR) is proposed to generate a high-resolution image of a Region of Interest (ROI) tilted with respect to the satellite track. Comparing to the traditional Spaceborne Sliding Spotlight Synthetic Aperture Radar (SSS-SAR), the SSS-RSSAR is superior in contributing to less data amount, lighter computational load and hence higher observation efficiency. Unlike the Spaceborne Stripmap Range Sweep Synthetic Aperture Radar (SS-RSSAR) proposed in a previous paper, the SSS-RSSAR not only continuously sweeps the beam in range for the ROI tracking, but also in azimuth to enlarge the synthetic aperture for an improved azimuth resolution. Two aspects of the SSS-RSSAR are focused: system and imaging. For the system part, a Continuous Varying Pulse Interval (CVPI) technique is proposed to avoid the transmission blockage problem by non-uniformly adjusting the pulse intervals based on the geometry. For the imaging part, a Modified Polar Format Algorithm (MPFA) is proposed to accommodate the original polar format algorithm to the echo received with the CVPI technique. Moreover, an integrate system parameter design flow for the SSS-RSSAR is also suggested. The presented approach is evaluated by exploiting the point target simulations.

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“…However, the modern generation of spaceborne SAR systems suffers a basic constraint between high azimuth resolution and wide swath coverage. For example, the sliding spotlight and spotlight modes are operated for a high geometric resolution at cost of the reduced swath width [2][3][4][5], while ScanSAR [6,7] and Terrain Observation by Progressive Scans (TOPS) [8][9][10] are adopted for the wide swath coverage but with an impaired azimuth resolution.…”

Section: Introductionmentioning

confidence: 99%

Two Dimension Digital Beamforming Preprocessing in Multibeam Scansar

Huang¹,

Xu²,

Qi³

2013

PIER

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Abstract-The novel multibeam ScanSAR takes advantage of the displaced phase center multiple azimuth beam (DPCMAB) imaging scheme and intra-pulse beam steering in elevation in ScanSAR to achieve the high-resolution ultra-wide-swath imaging capacity. This letter proposes an innovative two-dimensional (2D) digital beamforming (DBF) space-time preprocessing approach for multibeam ScanSAR. According to echo proprieties of such imaging scheme, both azimuth ambiguity and range ambiguity problems should be resolve before a conventional ScanSAR imaging processor. After range compressing in each receive channel, a 2D DBF processor is carried out in the range-Doppler domain. The azimuth DBF operation is adopted to resolve the azimuth nonuniform sampling problem in multichannel SAR systems, while the DBF preprocessing in elevation is carried out to separate echoes from different subswaths corresponding to different sub-pulses. Imaging results on simulated distributed targets validate the proposed 2D DBF preprocessing approach.

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Scanning Spaceborne Synthetic Aperture Radar with Integrated Radiometer

Cited by 148 publications

References 4 publications

Optimal "focusing" for low resolution ScanSAR

Optimal "focusing" for low resolution ScanSAR

A Novel Spaceborne Sliding Spotlight Range Sweep Synthetic Aperture Radar: System and Imaging

Two Dimension Digital Beamforming Preprocessing in Multibeam Scansar

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