用离散的植被模型分析地物的微波辐射

Analy-sing Emission Form of Vegetation-covered Soil by Discrete Vegetation Model

在研究被动微波辐射过程中 ,覆盖的植被层通常看作是一层均匀的连续介质 ,用简单的半经验模型来表征植被层的传输和辐射特性。本文使用一种离散的基于辐射传输理论的植被模型 ,这种模型基于物理散射机制 ,能更加真实地描述组成植被的散射个体如叶、茎、枝等对辐射的影响。模拟结果跟实际的PBMR数据相比 。

In the research of passive microwave emission, the vegetation above soil is often treated as an uniform layer, and a semi empirical model is used to characterize its transmissivity and emissivity. In this paper a dicrete vegetation model based on radiative transfer theory is proposed. This model not only reflect the physical scattering mechanism, but also describes the scatter contribution of leaf, stem and branch to the whole emission. A good agreement has been achieved between simulation results and the measured PBMR(PushBroom Microwave Radiometer) data.