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Autofocus method for SAR image with multiāblocks
- Source :
- The Journal of Engineering (2019)
- Publication Year :
- 2019
- Publisher :
- Institution of Engineering and Technology (IET), 2019.
-
Abstract
- In order to solve synthetic aperture radar image-focus problem when space-variant motion errors could not be ignored, this study proposes a partitioned phase gradient autofocus (PGA) method. In this method, it is most important whether the dominant scatters is in the partitioned images or not. In order to find the dominant scatters, energy gradient factor is defined and energy inflection point is determined. Then, the judgment is made by energy gradient factor and its threshold. Based on measured data processing, it is indicated that the method could distinguish the partitioned images with significant dominant scatters, un-significant dominant scatters, and without dominant scatters. PGA is implemented on all blocks with significant dominant scatters and partial blocks with un-significant dominant scatters. There is no need to use PGA for the blocks without dominant scatters.
- Subjects :
- Synthetic aperture radar
Energy gradient
energy inflection point
PGA method
Computer science
Energy Engineering and Power Technology
02 engineering and technology
image motion analysis
law.invention
Image (mathematics)
0203 mechanical engineering
law
energy gradient factor
Autofocus
020301 aerospace & aeronautics
Data processing
synthetic aperture radar image-focus problem
space-variant motion errors
General Engineering
radar imaging
SAR image
lcsh:TA1-2040
Inflection point
Phase gradient
partitioned phase gradient autofocus method
lcsh:Engineering (General). Civil engineering (General)
Algorithm
gradient methods
data processing
Software
Energy (signal processing)
synthetic aperture radar
Subjects
Details
- ISSN :
- 20513305
- Volume :
- 2019
- Database :
- OpenAIRE
- Journal :
- The Journal of Engineering
- Accession number :
- edsair.doi.dedup.....5517c472e0227625562f4b488666f1d8