基于多阶散射模型的玉米后向散射特性分析

合成孔径雷达(Synthetic Aperture Radar,SAR)由于其特有的全天时、全天候成像及对农作物的穿透探测能力,已成为农作物信息获取的重要手段。该文建立基于Matrix Doubling 算法的玉米多阶散射模型,以全极化雷达遥感数据Radarsat-2为数据源进行模型验证,在模型基础上,根据玉米关键生长期的几何参数,分析了玉米的时域散射特征;玉米不同生长期由于结构上的差异,散射特征差别很大:在玉米出苗期,小角度情况下C波段VV-HV适用于土壤湿度的提取;在玉米成熟期,大角度情况下C波段HH-HV较适合玉米叶片含水量的分析。

Scattering Characteristics of Maize by Multi|scattering Model Simulation

With the capabilities to observe all weather,all time and penetrate the crops,Synthetic Aperture Radar (SAR) has become a major tool to retrieve parameters of crop.This paper develops a multi-scattering model of maize based on Matrix Doubling algorithm,validates the model by polarimetric radar of RadarSat|2 data.The physical parameters dataset of the ground and maize are collected as input parameters to simulate the characteristics of maize in different phenophase by this model.Different structure characteristics of maize result in different backscattering characteristics.At low incidence angle,C-band frequency,a strong relationship between soil moisture and the depolarization ratio in dB ( VV-HV) is presented in the seeding stage of maize.At high incidence angle,C-band frequency,the sensitivity between leaf water content and  HH-HV  is also observed in the ripening stage of maize.