冬小麦微波散射特性研究  

Winter Wheat Microwave Scattering Characteristics Research

作　　者：戈建军[1] 王超[1] 

机构地区：[1]中国科学院遥感应用研究所

出　　处：《遥感信息》2002年第3期7-10,47,共5页Remote Sensing Information

摘　　要：建立在森林树木散射机理上的 MIMICS模型通过改变其模型结构 ,用来研究冬小麦的散射特性 ,并详尽地考虑小麦叶、茎和地表土壤三种散射因子。经与实测数据的比较 ,改变后的 MIMICS(Michigan microwave canopy scattering m odel)模型能够较好的预测同极化条件下冬小麦随入射角的后向散射变化而变化。通过模型结果可以看出 ,在冬小麦不同的散射机理成分中 ,冠层直接散射和地表散射在总散射中的贡献最大 ,当入射角变大时 (>30°) ,地表散射迅速降低。This paper presents the results obtained from the MIMICS ( Michigan Microwave Canopy Scattering ) forest backscattering model which was modified to accommodate three main scattering components of winter wheat to study the scattering characteristics of winter wheat. Through comparison with field data, MIMICS can predict values of backscattering coefficient at different incidence angles at C band for like polarization (HH and VV) with much confidence. An analysis of the different backscattering mechanism contributions is also given for winter wheat. The major scattering is from crown and ground directly, but as the incidence angle is more than 30°, the contribution of ground decrease dramatically.

关 键 词：微波散射特性 冬小麦 MIMICS 后向散射系数 小麦叶 茎 地表土壤 

分 类 号：S127[农业科学—农业基础科学]