摘要
利用射线跟踪技术,综合考虑了隧道表面介电常数和反射系数、收发信机的工作频率和功率、以及天线增益等因素,建立了电波在矩形隧道中传播的确定预测模型,推导出了三维情况下,隧道中收发信机的距离与有效反射线条数的关系式、单根射线的传输损耗和传输时延随距离变化的关系式、以及多径情况下总的接收信号功率和传输衰减的表达式,为抗衰落技术的应用打下了基础。然后以井下隧道为例对无线传播模型进行了仿真,通过仿真波形与类似条件下实测结果的对比,说明了建立的模型是正确的。
Using ray tracing technique, synthetically considering the tunnel dielectric constant and reflectance, the frequency and power of transceiver, and the gain of antennas, etc, a certain prediction model and simulating of the propagation of electromagnetic wave in tunnel is built up, the relationship between the transmission distance and the valid number of multipath, the relationship between the transmission distance and single path transmission attenuation and time delay, and the expressions of total power and transmission attenuation of multipath signals in three dimensions are deduced. It is the base of the application of anti-decline technique. Finally, by contrasting multipath transmission simulating results and the test results with the similar situation it is demonstrates that the built model is feasible.
出处
《电波科学学报》
EI
CSCD
北大核心
2008年第1期195-200,共6页
Chinese Journal of Radio Science
基金
北京工业大学博士基金资助项目(资助号:52002012200401)
关键词
信道仿真
预测模型
多径传播
射线跟踪
channel simulation
prediction model
multipath transmission
ray tracing
