在使用被动微波技术反演土壤水分的过程中, 为去除植被的影响, 通常采用适用于低频的τ-ω模型。为准确评估较高频率下植被的散射和衰减特性, 以玉米为例, 采用基于光线跟踪原理的双矩阵(Matrix-Doubling)微波辐射模型, 研究不同高度的作物在C(6.925 GHz)、X(10.65 GHz)和Ku(18.7 GHz)波段下的单散射反照率和传输率。模型模拟的亮度温度跟车载微波辐射仪的野外实测数据接近。为验证模拟的玉米自身微波辐射, 在玉米地上铺设了一层铝箔屏蔽地表的辐射。通过给验证后的模型输入不同的

To remove vegetation effect in soil moisture retrieval by passive microwave technique at lower frequencies, the τ-ω model is often used. In order to evaluate the scattering and attenuation characteristics of vegetation at higher frequencies, a Matrix-Doubling microwave emission model based on ray-tracing technique was used on corn, to study its single scattering al-bedo and transmissivity with different height at C (6.925GHz), X (10.65GHz) and Ku (18.7GHz) bands. The comparison be-tween simulation results and the data collected by a truck-mounted microwave radiometer in a field experiment are good. To verify the simulated emission from corn layer only, the ground surface of corn field was placed with an Aluminum foil, so as to mask the emission from the soil. A Brightness Temperature database was setup by assigning a variety of parameters to the veri-fied model, to simulate Brightness Temperature of natural corn field with different height. The results by the Matrix-Doubling model were then matched with those by τ-ω model at the same condition by least-square deviation, so as to retrieve the effective single scattering albedo and transmissivity of corn at C, X and Ku-band.