自然辐射的绕射分析以及成像模拟  

Diffraction and Image Simulation of Natural Microwave Radiation

作　　者：张成[1] 吴季[1] 

机构地区：[1]中科院空间科学与应用研究中心空间微波遥感技术实验室

出　　处：《电子学报》2008年第6期1068-1073,共6页Acta Electronica Sinica

基　　金：国家自然科学基金(No.40674070,40671121)

摘　　要：利用几何绕射理论分析了自然辐射的绕射,得出了绕射亮温的计算公式,以墙角为例对自然环境的绕射进行计算,结果表明,除了处于太阳的入射角度和反射角度以外,其他情况下的绕射亮温非常微弱可以忽略.在不计绕射的情况下利用射线追踪法来进行自然场景微波辐射的成像模拟,分析了成像模拟过程中的各种关键因素,并利用真实场景进行了仿真验证.The diffraction of natural radiation is analyzed with GTD theory and the brightness temperature formula is deduced to calculate the diffraction effects. The numerical results indicate that the natural environment and the sun out the direct viewing field only generate ignorable diffraction.temperatures of more less than 1K. Without considering diffraction effects the my tracing method was introduced to the image simulation of natural scene radiation, the emitting model and illuminating model of natural surface are established,the polarization rotation in ray transmission process are also considered. Real scene of building is simulated at last and validated by comparing with field measttrement, which indicates that this simulation model is completely feasible in practice.

关 键 词：几何绕射 被动微波成像 射线追踪 场景模拟 

分 类 号：TP722.6[自动化与计算机技术—检测技术与自动化装置]