A Novel Imaging Algorithm for Spotlight SAR Based on Scaling Transform

Based on the principle of planar wavefront assumption, a novel point of view in processing the spotlight synthetic aperture radar (SAR) data is proposed in this letter. After match filtering and motion compensation to the scene center, from the perspective of range cell migration correction (RCMC),...

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Bibliographic Details
Published in:IEEE geoscience and remote sensing letters 2022, Vol.19, p.1-5
Main Authors: Han, Shengliang, Zhu, Daiyin, Mao, Xinhua
Format: Article
Language:English
Subjects:
Algorithms
Approximation algorithms
Azimuth
Azimuth-time scaling
Cell migration
Image processing
Image resolution
Imaging
Imaging techniques
Motion compensation
planar wavefront assumption
Radar data
Radar imaging
range cell migration correction (RCMC)
range-frequency scaling
SAR (radar)
Scaling
Scaling factors
Synthetic aperture radar
Transforms
Wave fronts
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Summary:Based on the principle of planar wavefront assumption, a novel point of view in processing the spotlight synthetic aperture radar (SAR) data is proposed in this letter. After match filtering and motion compensation to the scene center, from the perspective of range cell migration correction (RCMC), two scaling transforms (a range-frequency scaling with a subsequent azimuth-time scaling) are proposed to correct the range cell migration caused by the coupling between the range-frequency and azimuth-time. Moreover, to reduce the spectrum loss (the loss of image resolution), two constant scaling factors are introduced to optimize the range-frequency and azimuth-time scaling transforms, which enable the presented algorithm to realize the flexible and efficient imaging ability. Simulation results are conducted to validate the efficacy of this algorithm.
ISSN:1545-598X
1558-0571
DOI:10.1109/LGRS.2022.3179722