基于SIR-C数据的SAR极化特征参数区分海冰与海水的能力评价  

THE CAPACITY EVALUATION THAT USE POLARIZATION CHARACTERISTIC PARAMETERS OF SAR TO DISTINGUISH SEA ICE AND SEAWATER WITH SIR-C DATA

作　　者：张婷[1] 张杰[1] 刘眉洁[2] 张晰[1] 

机构地区：[1]国家海洋局第一海洋研究所,山东青岛266061 [2]青岛大学,山东青岛266071

出　　处：《极地研究》2015年第2期183-193,共11页Chinese Journal of Polar Research

基　　金：海洋公益性行业科研专项经费(201105016);国家自然科学基金(41306193)资助

摘　　要：利用1994年10月南极区域的6景SIR-C影像,评估了L波段和C波段下13种主要的SAR极化特征参数区分海冰、海水信息的能力。结果表明:L波段下有6种参数能较好地区分海冰和海水,它们是:散射熵、交叉极化比HV/VV、同极化比VV/HH、同极化相关系数ρHH-VV、HV极化后向散射系数、Alpha角;另外,HH极化后向散射系数、交叉极化比HV/HH具有一定的区分海冰和海水的能力;其余5种难以区分海冰和海水。C波段下有4种参数能较好地区分海冰和海水,他们是:散射熵、同极化相关系数ρHH-VV、HV极化后向散射系数、同极化比VV/HH;HH极化后向散射系数、交叉极化比HV/VV、Alpha角和VV极化后向散射系数这4种参数具有一定的区分海冰和海水的能力;其余5种难以区分海冰和海水。且总体来看,L波段区分海冰和海水的能力好于C波段。这为海冰探测的研究提供了有用的参考。The sea ice identification capability of 13 kinds of polarization characteristic parameters on L-band and C-band using SIR-C images in Antarctica are assessed. Six parameters best distinguish sea ice from seawater on L-band： entropy, cross polarization ratio HV/VV, polarization ratio VV/HH, polarization correlation coefficient Pun-w, HV polarization backscatter coefficient, and Alpha angle. Additionally, HH polarization backscatter coefficient and cross-polarization ratio HV/HH differentiate sea ice from seawater, whereas other parameters experience difficulty doing so. Four parameters best distinguish sea ice and seawater on C-band： entropy, polarization correlation coefficient P,^-vv, H~ polarization backscatter coefficient, and polarization ratio VV/HH; HH polarization backscatter coefficient, cross-polarization ratio HV/VV, Alpha angle and VV polarization backscattering coefficient can also differentiate sea ice and seawater, but the remaining five parameters have difficulty doing so. Overall, L-band capabilities distinguish sea ice from seawater better than C-band. This provides a useful reference for sea ice detection studies.

关 键 词：SIR-C 极化特征参数区分 海冰 海水 

分 类 号：P731.1[天文地球—海洋科学]