基于辐射传输方程的低损耗介质微波介电常数反演

微波介电常数是分析和研究微波与介质之间相互作用的重要基础参数之一。笔者设计了一种针对低损耗介质微波介电常数的反演方法。引入并改进了辐射传输方程,将介质介电常数的实部和虚部与其微波亮温相关联。在温度均匀分布且表面光滑的条件下,利用改进的辐射传输方程,构造了低损耗介质微波介电常数的反演模型。基于模拟月壤物质,进行了反演模型的验证。结果表明,反演的介电常数的实部与北京师范大学提供的检测结果吻合良好,虚部与阿波罗14号月壤样品的平均测量值吻合良好。

Inversion of microwave dielectric constant of low-loss medium based on radiative transfer equation

Microwave dielectric constant of medium is one of the important basic parameters to analyze and study the interaction between the microwave and the medium.An inversion method is constructed to retrieve the microwave dielectric constant of the low-loss medium.The radiative transfer equation is introduced and improved to relate the real and imaginary part of the microwave dielectric constant of the medium to its microwave brightness temperature.Then,the model for retrieving the dielectric constant of low-loss medium is constructed with the improved radiative transfer equation on conditions that the temperature is uniformly distributed and the surface is smooth.The result shows,the real part of inversion model is validated with the resulto from Beijing Normal University,and the imaginary part is validated well with the lunar sample from Apdlo 14.