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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Microwave emission of vegetation: sensitivity to leaf characteristics
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Microwave emission of vegetation: sensitivity to leaf characteristics

机译：植被的微波发射：对叶片特征的敏感性

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摘要

The effects of leaf characteristics on the microwave emission of land surfaces are analyzed. In order to simulate these effects, a radiative transfer model is presented. The medium consists of a vegetated layer containing randomly oriented leaves, modeled as elliptic-shaped scatterers, over the ground surface. Radiative transfer equations are solved with a discrete-ordinate-eigenanalysis method. The calculation of the phase matrix of the elliptic scatterers is based on the generalized Rayleigh-Gans approximation, which increases the frequency range of the modeling. The sensitivity of brightness temperature and polarization ratio to leaf characteristics, volume fraction, gravimetric moisture, size, shape, and inclination distribution is investigated at C-, and X-band. The behavior of the simulated emission of a soybean canopy versus frequency and incidence angle is studied for different soil moisture levels. Up to 10 GHz the microwave emission appears to contain significant information on underlying soil moisture.
机译：分析了叶片特性对陆地表面微波发射的影响。为了模拟这些影响，提出了一种辐射传递模型。介质由一个植被层组成，该植被层在地面上包含随机定向的叶子，建模为椭圆形散射体。用离散坐标本征分析法求解辐射传递方程。椭圆散射体的相位矩阵的计算基于广义瑞利-甘斯近似，从而增加了建模的频率范围。研究了C波段和X波段亮度温度和偏振比对叶片特性，体积分数，重量水分，尺寸，形状和倾角分布的敏感性。针对不同土壤水分水平，研究了大豆冠层模拟排放行为与频率和入射角的关系。在高达10 GHz的频率下，微波发射似乎包含有关潜在土壤水分的重要信息。

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