Abstract: Based on the Vector Radiative Transfer(VRT) theory and the characteristics of the SAR technology, several sub-models for rice backscattering are constructed, including the leaf scattering model, the leaf extinction model, the trunk scattering model, the trunk extinction model and the water reflection model. Then an integrated model for the first-order scattering mechanisms of rice, including all the main physical processes, is achieved. Based on the simulation results, it is discussed that the variations of the rice backscattering coefficient with the date, incidence angle, wave band, and polarization.

Key words: VRT, backscattering coefficient, rice, microwave remote sensing

摘要： 针对合成孔径雷达(SAR)的技术特点，以水稻为研究对象，从矢量辐射传输理论(VRT)出发，通过模拟水稻主要器官稻叶和稻杆对电磁波的散射、衰减作用等物理过程，建立了一套完整的水稻一次后向散射作用的物理模型，用以模拟水稻层的后向散射系数σ⁰，并根据模型模拟结果初步讨论了水稻后向散射系数随时相、入射角、波段和极化等因素的变化规律。

关键词: 矢量辐射传输理论, 后向散射系数, 水稻, 微波遥感