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Four-Component Model-Based Decomposition for Ship Targets Using PolSAR Data

Department of Physics & Electronics, Beijing University of Chemical Technology, Beijing 100029, China
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Author to whom correspondence should be addressed.
Academic Editors: Zhenhong Li and Prasad S. Thenkabail
Remote Sens. 2017, 9(6), 621; https://doi.org/10.3390/rs9060621
Received: 20 March 2017 / Revised: 26 May 2017 / Accepted: 13 June 2017 / Published: 16 June 2017
Scattering mechanism (SM) analysis is a promising technique for ship detection and classification in polarimetric SAR (PolSAR) images. In this paper, a four-component model-based decomposition method incorporating surface, double-bounce, volume and cross-polarized components is proposed for analyzing the SMs of ships. A novel cross-polarized scattering component capable of discriminating between the HV scattering power generated by the oriented scatterers on ships from that by volume scatterers is proposed as a means to address the problem of volume scattering power overestimation. In the decomposition stage, by taking into account both the real and imaginary parts of the elements [ T ] H V ( 1 , 3 ) and [ T ] H V ( 2 , 3 ) of the observed coherency matrix, the proposed cross-polarized component can preserve the reflection asymmetry information completely, which is an essential property of man-made targets, such as ships. Based on the proposed decomposition method and an analysis of the different SMs between ships and sea clutter, a novel ship detection metric defined as M = ln P d + P c P s is proposed. Experimental results conducted on RadarSat-2 quad-polarimetric data validate the proposed four-component decomposition method as being more suitable for analyzing the SMs of ship targets than the existing helix matrix-based decomposition methods. Additionally, we find that the proposed ship detection metric can effectively enhance the signal-to-clutter ratio (SCR) and improve ship detection performance. View Full-Text
Keywords: polarimetric SAR (PolSAR); scattering mechanisms (SMs); incoherent decomposition; cross-polarized component; reflection asymmetry; ship targets polarimetric SAR (PolSAR); scattering mechanisms (SMs); incoherent decomposition; cross-polarized component; reflection asymmetry; ship targets
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Xi, Y.; Lang, H.; Tao, Y.; Huang, L.; Pei, Z. Four-Component Model-Based Decomposition for Ship Targets Using PolSAR Data. Remote Sens. 2017, 9, 621.

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