扩展RAPID模型模拟森林微波后向散射

在原有光学尺度上扩展了适用于多孔单个物体的辐射传输模型(RAPID)，提出了适用于微波区域的广义辐射传输模型(RAPID2)。这是辐射传输理论首次应用于微波遥感，为更有效地解决雷达多次散射问题提供了一种新方法。RAPID2有四个新功能:投射半透明物体，跟踪镜面散射，分离偏振组件和成像雷达信号。在雷达截面(RCS)和双向反射因子(BRF)之间建立了桥梁。将修正后的Stokes矢量和Mueller矩阵引入到辐射公式中，统一了光学和微波区域的散射过程。RAPID2可以在包含地形的植被3D场景上模拟双重反弹和多重散射效果。模拟的雷达图像可以很好地反映雷达的不同几何特征，包括停留、透视和阴影。Starting from the existing radiative transfer model (RAPID) designed for porous individual objects at the optical scale, we extended the model and developed a generalized radiative transfer model (RAPID2) applicable to the microwave frequency range. This marks the first application of radiative transfer theory to microwave remote sensing, providing a novel approach to more efficiently address radar multiple scattering issues. RAPID2 integrates four new functionalities: projection of translucent objects, specular scattering tracking, polarization component separation, and radar signal imaging. A connection is established between radar cross section (RCS) and bidirectional reflectance factor (BRF). By introducing modified Stokes vectors and Mueller matrices into the radiative transfer formulation, the scattering processes in both optical and microwave domains are unified. RAPID2 is capable of simulating double-bounce and multiple scattering effects in 3D vegetated scenes containing terrain. The simulated radar images can faithfully reproduce the distinct geometric features of radar, including layover, foreshortening, and shadow.

搜集汇总

背景与挑战

背景概述

该数据集基于扩展的RAPID模型（RAPID2），首次将辐射传输理论应用于微波遥感，以模拟森林的微波后向散射。RAPID2具备投射半透明物体、跟踪镜面散射等新功能，能够有效模拟雷达多次散射效果，为森林参数反演提供新方法。