Back to Search
Start Over
Autofocus method for SAR image with multi-blocks
- Source :
- The Journal of Engineering (2019)
- Publication Year :
- 2019
- Publisher :
- Wiley, 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 :
- radar imaging
synthetic aperture radar
gradient methods
image motion analysis
SAR image
synthetic aperture radar image-focus problem
space-variant motion errors
partitioned phase gradient autofocus method
energy gradient factor
energy inflection point
PGA method
data processing
Engineering (General). Civil engineering (General)
TA1-2040
Subjects
Details
- Language :
- English
- ISSN :
- 20513305 and 95278214
- Database :
- Directory of Open Access Journals
- Journal :
- The Journal of Engineering
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.0a9527821445419e8079f785586fecac
- Document Type :
- article
- Full Text :
- https://doi.org/10.1049/joe.2019.0463