中文摘要：

毫米波技术应用的基础是物体在毫米波波段的辐射特性的差异，但现阶段物体在毫米波波段的辐射特性的研究缺乏相关理论和试验验证支撑，因此进行了8mm波段砂土辐射特性和含水量相关关系的建模和仿真研究，通过菲涅尔折射定律及理想介质面波的连续性推导出了理想介质面的反射率计算公式，然后利用该公式进行了8mm波段水面辐射特性和含水量对砂土辐射特性影响的仿真，最后通过测量和计算增加砂土含水量对砂土辐射特性影响的定性试验进行仿真结果的定性验证；试验结果和仿真结果一致，砂土随着含水量的增加发射率在下降，砂土的亮温在下降，通过这一结论可以通过砂土亮温的变化定性反演出砂土含水量的变化，从而为毫米波技术在监测含水量等方面的应用提供一定的理论研究和试验验证支撑。

英文摘要：

The basis of millimeter wave technology application is the difference of radiation characteristics between Objects in millimeter wave band, but the study of objects＇ radiation characteristics in millimeter wave band is lack of relevant theoretical and experimental verifica- tion support in present stage. Therefore in this paper, we focused on the building model and simulation about radiation characteristics of sand soil affected by water content on 8 mm wave band, and designed experiments to verify the correlation between the radiation characteristics of sand soil with water content. By the Fresnel formula and continuity of wave on the ideal medium surface, deduced the reflectivity calculation formula on the ideal medium surface. Then simulation about radiation characteristics of water surface and radiation characteristics of sand soil affected by water content on 8 mm wave band by the deduced formula been carried out. Finally we designed a qualitative test to qualitative verify the simulation results. The simulation results were in agreement with the experimental results. With the increase of water content, the emission rate and brightness temperature of sand soil decreased. By this conclusion we can qualitative invert the change of sand soil＇ s water content according to the change of sand soil＇ s brightness temperature. That provides the theoretical and experimental verification support for the application of millimeter wave technology in monitoring water content etc.