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双矩阵MD(Matrix-Doubling)算法是辐射传输方程的一种数值解,考虑了植被层内的多次散射信号,具有较高的模拟精度。但受限于算法的复杂性,很难直接应用到地表参数的反演中。本文以玉米覆盖地表为研究对象,基于MD算法的模拟数据,发展了一种L波段多角度微波辐射参数化模型。基于模拟数据的对比结果表明,参数化模型具有与理论模型相当的精度,两者之间的发射率误差不超过0.004(V极化)和0.007(H极化)。同时,结合黑河流域的地面实测数据,利用本论文中发展的参数化模型模拟了纯玉米像元的辐射亮温。该模拟结果与相同像元尺度上机载L波段微波辐射计(PLMR)观测亮温之间的差异基本在10 K以内。
Matrix-Doubling (MD) algorithm is a numerical solution to the radiative transfer equation, which takes into account multiple scattering signals in the vegetation layer and has high simulation accuracy. However, due to the complexity of the algorithm, it is difficult to apply it directly to the inversion of surface parameters. In this paper, the ground cover of maize is taken as the research object. Based on the simulation data of MD algorithm, a parametric L-band multi-angle microwave radiation model is developed. The comparison results based on the simulation data show that the parametric model has the same precision as the theoretical model, and the emissivity error between the two does not exceed 0.004 (V polarization) and 0.007 (H polarization). At the same time, combined with the measured data from the ground in the Heihe River Basin, the radiative temperature of pure corn pixels was simulated by using the parametric model developed in this paper. The difference between this simulation result and the PLMR observation air temperature on the same pixel scale is basically within 10 K.