电磁波穿墙特性研究.docVIP

摘要 在工作和日常生活中人类及各种生物不可避免的受到来自自然灾害（如地震、滑坡、塌陷）、人为灾害（战争、恐怖活动）以及各类突发事件的危害。当灾害发生时，如何以最快的方式，最高效的方法，最大限度地减轻各类灾害所带来的损失，是灾害救助的首要任务，也是最能体现出赈灾实效和社会温暖的关键环节。穿墙探测雷达的工作频率主要在几百MHz到几GHz，在这个频段范围内，既可以保证电磁波穿墙后一定的作用距离，又可以获得较高的距离分辨率。由于不同材料墙体对电磁波的衰减作用在不同频段表现出的特性不同，因此有必要对电磁波的穿墙特性进行深入研究。 本文主要研究不同材料（木材、石膏、混凝土）墙体模型对电磁波的衰减特性。利用美国Remcom公司研发的XFDTD电磁仿真软件，采用时域有限差分方法实现对不同材料和不同厚度墙体条件下电磁波反射和传输特性的研究。仿真结果表明墙体的介电常数影响电磁波反射系数和传输系数的最大值，而电导率反映了不同墙体对电磁波的衰减作用。并且不同频率电磁波穿墙过后的衰减程度不同，频率高的电磁波衰减较大。同时对含有钢筋结构的混凝土墙体也进行了初步研究。 关键字： 传播衰减，传输系数，反射系数，墙体材料，时域有限差分方法 ABSTRACT In work and daily life of human and biological inevitably suffer from natural disasters（earthquakes, landslide, collapse）, man-made disasters (war, terrorism) and all kinds of incidents. When disasters occur, how to reduce the loss caused by various disasters with the fastest way, the most efficient method and the maximum is the primary task of the disaster relief, also can reflect the key link to the actual effect of relief and the warmth of our socialist society. The frequency of CW radar detector works from 10MHz to 3GHz. In this range of frequency,which may ensure to have the effective distance after electromagnetic wave through the wall, and can obtain the distance higher resolution. As the walls of different materials on the electromagnetic wave attenuation in different frequency characteristics show different, so it is necessary characteristics of the electromagnetic wave through the wall depth. This paper mainly studies the attenuation characteristics of different materials (wood, plaster and concrete）of wall model. Using XFDTD electromagnetic simulation software of the American remcom, which research the reflection and transmission of electromagnetic characteristics under the condition of different materials and wall thickness by FDTD method. Simulation results show that the wall permittivity influence the maximum of reflection coefficient and transmission coefficient of electromagnetic wave, but the conductivity show that the different wall infl