DocumentCode :
3025825
Title :
Synthetic aperture imaging using a randomly steered spotlight
Author :
Dehong Liu ; Boufounos, Petros T.
Author_Institution :
Mitsubishi Electr. Res. Labs., Cambridge, MA, USA
fYear :
2013
fDate :
21-26 July 2013
Firstpage :
919
Lastpage :
922
Abstract :
In this paper, we develop a new approach to synthetic aperture imaging inspired by recently developed compressive sensing (CS) methods. Our approach modifies the beam steering pattern of conventional sliding spotlight-mode systems and randomizes it such that with each pulse the beam illuminates a different, randomly chosen, part of the imaged area. The randomization allows the acquisition of the area of interest with a significantly larger effective aperture compared to the conventional sliding spotlight mode and, therefore, with significantly larger resolution. The reconstruction estimates the signal using a model that combines a sparse and a dense component. This model captures the structure of SAR images better than conventional sparse models, typically used in CS, and provides superior reconstruction performance. Our experimental results demonstrate that the proposed randomly steered spotlight array can improve imaging resolution, as measured by the reconstruction SNR and the phase error, without compromising the covered area size.
Keywords :
beam steering; compressed sensing; image reconstruction; image resolution; radar imaging; random processes; synthetic aperture radar; CS method; SAR imaging; beam steering pattern; compressive sensing method; image reconstruction; image resolution; randomly steered spotlight; randomly steered spotlight array; signal reconstruction; sliding spotlight-mode system; synthetic aperture radar imaging; Apertures; Arrays; Image reconstruction; Image resolution; Imaging; Radar imaging; Synthetic aperture radar; compressive sensing; high resolution; random steering; synthetic aperture;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Geoscience and Remote Sensing Symposium (IGARSS), 2013 IEEE International
Conference_Location :
Melbourne, VIC
ISSN :
2153-6996
Print_ISBN :
978-1-4799-1114-1
Type :
conf
DOI :
10.1109/IGARSS.2013.6721310
Filename :
6721310
Link To Document :
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