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Remote Sensing Technology and Application  2018, Vol. 33 Issue (3): 499-507    DOI: 10.11873/j.issn.1004-0323.2018.3.0499
Fully Polarimetric SAR Ship Detection based onPCDM Shannon Entropy#br#
Zhang Cheng1,2,Zhang Hong1,Wang Chao1#br#
(1.Institute of Remote Sensing and Digital Earth,Chinese Academy of Sciences,Beijing 100094,China;
2.University of Chinese Academy of Sciences,Beijing 100049,China)
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Abstract  Polarimetric Synthetic Aperture Radar(PolSAR)data contains rich polarization information about the scattering properties of ground objects,having beenwidely used in maritime monitoring and objects detection.The polarization reaction differences between ship targets and sea clutters are analyzed.A ship detection method using the Shannon entropy of the Polarimetric Covariance Difference Matrix (PCDM) is proposed in this paper,which is applied to fully polarimetric SAR images.To enhance the contrast between the ship targets and sea background,the PCDM is generated by calculating the elemental differences between the polarimetric covariance matrix at each pixel and its neighbors.Then the Shannon entropy of SAR images are extracted on the basis of the Shannon entropy calculation formula,and the character difference between the ships and background in the Shannon entropy map is presented for ship detection.The false alarms in the detection result caused by the azimuth ambiguities are removed,based on the displacement distance and energy ratio relationship,between the target and azimuth ambiguity.The Radarsat\|2 Fine Quad data and the Chinese GF\|3 Quad\|Polarimetric Stripmap Ⅰ data are used,to verify the effectiveness of the proposed method,and the SPAN method,HV channel image and polarimetric whitening filter (PWF) method are applied for comparison.The detection and comparison results indicate that the proposed method is able to effectively enhance the ship\|sea contrast,and has higher detection accuracy.
Key words:  PCDM      Shannon entropy      Ship detection      PolSAR      Azimuth ambiguity     
Received:  09 August 2017      Published:  04 July 2018
TP 79  
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Zhang Cheng
Zhang Hong
Wang Chao

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Zhang Cheng,Zhang Hong,Wang Chao. Fully Polarimetric SAR Ship Detection based onPCDM Shannon Entropy#br#. Remote Sensing Technology and Application, 2018, 33(3): 499-507.

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