Paper Info
Title
Multichannel Sliding Spotlight SAR Imaging: First Result of GF-3 Satellite
Abstract
Multichannel SAR system operating in the sliding spotlight mode has the capacity of imaging with very high resolution as requested by future spaceborne synthetic aperture radar (SAR) mission; hence, it has been attracted more and more attention in the SAR community. In a multichannel sliding spotlight SAR system with $N$ channels, the overall Doppler bandwidth of the data acquired by each channel is greater than $N \cdot \text {PRF}$ ; thus, the preprocessing algorithms (channel mismatch calibration and signal reconstruction) are no more available. To address this issue, a full-aperture imaging method for azimuth multichannel sliding spotlight mode is proposed in this article. First, the raw data of each channel need to be preprocessed based on a deramping operation, which can obtain an unambiguous Doppler spectrum. Afterward, the algorithm proposed for single-channel sliding spotlight mode can be performed. Finally, to avoid possible back-folded SAR images, postprocessing after focusing is demanded in some cases. The imaging results of the data acquired by GaoFen-3 (GF-3) are given for the first time in this article, which proves the effectiveness of the proposed imaging method and demonstrates the capacity of high-resolution wide-swath imaging of the multichannel sliding spotlight mode.
Year
DOI
Venue
2022
10.1109/TGRS.2021.3068208
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
Keywords
DocType
Volume
Azimuth, Synthetic aperture radar, Imaging, Doppler effect, Image resolution, Spaceborne radar, Data acquisition, Azimuth multichannel, back-folded SAR image, channel mismatch calibration, signal reconstruction, sliding spotlight, synthetic aperture radar (SAR)
Journal
60
ISSN
Citations 
PageRank 
0196-2892
0
0.34
References 
Authors
0
7
Name
Order
Citations
PageRank
Tingzhu Fang100.34
Yunkai Deng229254.84
Da Liang305.07
Lei Zhang419522.87
Heng Zhang500.34
Huaitao Fan605.75
Weidong Yu7194.60