根据欧空局Envisat-1卫星上ASAR传感器的系统参数和双极化特点，利用AIEM模型模拟，建立了裸露地表同极化后向散射模型和粗糙度参数计算模型。前者把同极化总后向散射系数表达成人射角和两个地表参数（土壤水分和粗糙度）的函数；后者给出了用双极化雷达数据计算粗糙度的方法。把这两个模型结合，用于土壤水分反演，分别用模拟数据和实测数据验证，良好的结果证明了这两个模型的可靠性和实用性。双极化后向散射模型的建立，将为以后PALSAR（日本）和RADARSAT-2（加拿大）多极化雷达数据的应用打下基础。

Bare surface co-polarized backscattering model and roughness computing model is established using AIEM simulated data,based on the configuration and dual-polarized nature of Envisat-1 ASAR data.The former expresses co-polarized backscattering coefficient as the function of incidence angle and two surface parameters(namely,soil moisture and roughness);and the later gives the method to obtain roughness using dual-polarized radar data.Soil moisture is estimated by combining the two models,and validation is performed by both simulated data and in-situ data.The results show that the two models are reliable and useful.The foundation of dual-polarized model will benefit to the modeling and applications of multi-polarized radar data on PALSAR(Japan) and RADARSAT-2(Canada) in the future.