华东师范大学学报(自然科学版)

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远距离停车场系统无线信道传播损耗分析

郭凤鸣[1], 李 兵[1,2]   

  1. 1. 湖南机电职业技术学院, 长沙 410151
    2. 合肥工业大学电气与自动化工程学院, 合肥 230009
  • 收稿日期:2015-09-02 出版日期:2016-11-25 发布日期:2017-01-13
  • 通讯作者: 郭凤鸣, 男, 硕士, 副教授, 主要研究方向为无线传感网络、射频测试. E-mail：egfm2004@163.com.
  • 基金资助:

    湖南省科技厅科学计划项目(2014FJ6017);  湖南省教育厅科学研究项目(13C260);  中国博士后基金(2014M561820)

Analysis of the propagation loss of wireless channel for short range parking system

GUO Feng-ming[1], LI Bing[1,2]   

  1. 1. Hunan Mechanical & Electrical Polytechnic, Changsha 410151, China;
    2. School of Electrical and Automation Engineering, Hefei University of Technology, Hefei 230009, China
  • Received:2015-09-02 Online:2016-11-25 Published:2017-01-13

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摘要：

无线信道传播效率是影响远距离停车场系统(Short Range Parking System, SRPS)性能的主要因素之一. 以小轿车为例, 定义了远距离停车场系统信道传播损耗系数, 建立了基于两径模型的传播损耗模型. 仿真及实测结果表明: 天线极化方式和频率影响路径损耗大小, 标签贴在小轿车前挡风玻璃沿微波天窗处, 路径损耗最小; 标签识别范围小于 10 m 时, 地面电磁波反射引起垂直极化波损耗突变, 为保证标签成功识别, 阅读器天线距离地面高度应大于 1.18 m.

关键词: 远距离停车场系统, 两径模型, 损耗系数; 仿真分析

Abstract:

The wireless channel propagation efficiency is one of the main factors affecting the short range parking system (SRPS) performance. A channel propagation loss coefficient of SRPS is defined for cars, and a propagation loss model based on two-ray model is established. Simulation and measured results show that antenna polarization mode and frequency-influenced path loss is minimum, when tag is along the microwave skylight in car windshield; as tag identification range is less than 10 m, the vertically polarized wave loss is mutated by ground electromagnetic wave reflection. In order to make successful tag identification, the height of the reader antenna should be above 1.18 m.

Key words: short range parking system, two-ray model, loss coefficient, simulation analysis