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1、太原理工大学 硕士学位论文 无线传感器信号在圆形下水道内传播规律的研究 姓名：库亚晓 申请学位级别：硕士 专业：测试计量技术与仪器 指导教师：马福昌 20100401 ? ? ? ? ? !#$%,?AB?CDEF.GH )?IJKL?MN*O)PQRSTUVWXYZO? ?_)CDabF.GLcdef?I4g,hijkl- ./?mn9:;$F.GHABCD)? stuvwxy:z)?,6|x?K)?XYZ) ?TOH?F? ?$F.G?J?)?,YZE?NN?F.GH ?=?$?ICD?)?,o4x? ?xF.GH)ABCG?X F.GH%?,?=?$F.GCD?I)?$ ?P)? *OX
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4、 greater; in addition,the wet wall of sewer will cause changes in electrical parameters. Through systematic analysis of various factors on the effect of transmission characteristics, the hybrid model has been proposed to predict the law of signal wireless transmission,and then,the space of the sewer
5、 is divided into the near field area and the distant field area at two different regions: in the near-field zone, the free space propagation model could be used to predict propagation loss;while in the far-field zone, the ? ? modified waveguide propagation model could be used. Previous waveguide the
6、ory is used for the wireless transmission tunnel, but now,this method is used to study the signal wireless transmission characteristics in the sewer, and the hybrid model is creatively proposed to establish wireless channel model.In particular, the special factors affecting to the signal-the water i
7、s taken into account, and cleverly integrated into the model which makes the model more complete and realistic. In the later experiment, it is also proved that the model has good practical value. KEY WORDS: wireless communications, hybrid model, electromagnetic wave, attenuation rate This topic come
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