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2-D Frequency Autofocus for Squint Spotlight SAR Imaging With Extended Omega-K
- Source :
- IEEE Transactions on Geoscience and Remote Sensing. 60:1-12
- Publication Year :
- 2022
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2022.
-
Abstract
- In the existing time-domain autofocus algorithms, the azimuth deramping operation will change the azimuth-independent phase into the azimuth-dependent phase, which may greatly reduce the accuracy of autofocus processing in squint spotlight synthetic aperture radar (SAR). In contrast, the frequency-domain autofocus algorithms can avoid this problem because it does not involve the azimuth deramping operation. However, the existing frequency-domain autofocus algorithms are proposed based on the assumption of broadside mode, which cannot be directly applied to the squint mode. Therefore, this article extends the existing frequency-domain autofocus algorithm to the squint mode combined with the extended Omega-K (EOK) algorithm. Furthermore, a space division (SD) algorithm is embedded into the proposed algorithm as preprocessing, which can effectively compensate for the azimuth-dependent motion error. The simulation and real data are processed to verify the effectiveness of the algorithm.
- Subjects :
- Synthetic aperture radar
Autofocus
Computer science
business.industry
Phase (waves)
Computer Science::Software Engineering
Division (mathematics)
law.invention
Azimuth
law
Motion error
General Earth and Planetary Sciences
Preprocessor
Computer vision
Artificial intelligence
Electrical and Electronic Engineering
business
Subjects
Details
- ISSN :
- 15580644 and 01962892
- Volume :
- 60
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Geoscience and Remote Sensing
- Accession number :
- edsair.doi...........dd0f929d762c27564a0f57697da9cf00