Dem-assisted back-projection algorithm in high resolution geosynchronous SAR imaging

Since geosynchronous synthetic aperture radar (GEO SAR) has curved trajectories, back-projection algorithm (BPA) greatly fits for its imaging. However, for a scene with height variation, the reference range based on the fixed-height imaging grid under curved trajectories is inaccurate in azimuth bac...

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Bibliographic Details
Published in2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS) pp. 1190 - 1193
Main Authors YuanHao Li, XiChao Dong, Kai Cui, Cheng Hu, DongYang Ao, Teng Long
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.07.2016
Subjects
Azimuth
Back-projection Algorithm
DEM
GEO SAR
Image resolution
Imaging
Orbits
Radar polarimetry
SAR imaging
Synthetic aperture radar
Trajectory
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Summary:Since geosynchronous synthetic aperture radar (GEO SAR) has curved trajectories, back-projection algorithm (BPA) greatly fits for its imaging. However, for a scene with height variation, the reference range based on the fixed-height imaging grid under curved trajectories is inaccurate in azimuth back-projection. Resultantly, the GEO SAR image quality will be obviously deteriorated in high resolution imaging. To address the issue, this paper proposed the digital elevation model (DEM)-assisted BPA to realize the accurate high resolution GEO SAR imaging for the scene with height variation. DEM information is utilized to construct the imaging grid in the new method for generating the accurate reference range. Simulation results validate that the proposed method achieves good imaging performance for the scene with height variation.
ISSN:2153-7003
DOI:10.1109/IGARSS.2016.7729301