提出了一套完整的水稻一次后向散射作用的物理模型,通过该模型可以定量地模拟水稻对入射电磁波的后向散射作用,包括不同入射角、不同时相、不同波段、不同极化等各种情况,从而得到大量有价值的模拟结果。通过深入分析这些结果,可以对如何利用SAR遥感数据更准确、更经济、更方便地进行水稻识别、长势监测及产量评估等工作提供理论依据和方法指导。

Based on the Vector Radiative Transfer Theory (VRT)and SAR technology characteristics, several sub_models for rice are constructed such as leaf scattering model, leaf extinction models, trunk scattering model, trunk extinction model and water reflection model. Then an integrated model including all the main physical processes of rice first_order scattering mechanisms is achieved. By simulations using the validated model, the backscattering coefficient of the rice canopy which can be deduced from the SAR data will be obtained. It will be helpful in theoretical and methodological guidance for using SAR data to make rice fields mapping, rice growth monitoring and rice production forecasting more effectively, more economically and more expediently. In this paper, all of the models are introduced in detail and systema tically. Based on the simulation results, the variations of the rice backscattering coefficient with the date, incidence angle, wave band and polarization change are discussed. At the end of this article, some valuable quantificational results and practical conclusions are summarized.