Design of wireless Mesh communication system in coal mine
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摘要: 针对目前无线通信技术在煤矿井下特殊空间及多变工作环境下无法同时满足高吞吐速率、远距离传输、组网灵活、安装部署简单等需求，设计了一种煤矿井下无线Mesh通信系统。给出了单一巷道的无线Mesh网络节点分布，介绍了系统软硬件设计方法。网络节点由基带板和射频前端构成。基带板主要实现数字波形生成、支持嵌入式系统管理信息交互、接收信号自动增益控制功能；射频前端主要实现将射频发送信号强度放大到目标功率。测试结果表明：① 当射频前端发射增益＞17 dB时，调整AD9361软件无线电模块的平均输出功率可使系统平均输出功率为37 dBm；② 射频前端发射的邻信道功率比<-43 dBc；③ 射频前端接收链路插入损耗<1.8 dB，收发切换时间<1 μs；④ 系统平均吞吐速率≥45 Mbit/s，满足煤矿井下监控视频传输不卡顿的需求；⑤ 通话质量等级≥3，说明在大部分工作时段内通话比较清晰。
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关键词:
- 煤矿井下 /
- 无线通信 /
- 无线Mesh网络 /
- 移动Mesh网络节点 /
- 固定Mesh网络节点 /
- 射频信号 /
- 自动增益控制 /
- 时分双工
Abstract: The current wireless communication technology cannot meet the requirements of high throughput rate, long-distance transmission, flexible networking, and simple installation and deployment in the special space and variable working environment of coal mine. In order to solve the above problems, a wireless Mesh communication system in coal mine is designed. The distribution of wireless Mesh network nodes in a single roadway is proposed, and the system hardware and software design method is introduced. The network node is composed of baseband board and RF front-end. The baseband board mainly realizes digital waveform generation, supports embedded system management information interaction and automatic gain control of received signal. The RF front-end mainly achieves the function of amplifying RF signal intensity to the target power. The test results are listed as follows. ① When the RF front-end transmission gain is >17 dB, adjusting the transmission average output power of AD9361 software radio module can make the system average output power 37 dBm. ② The adjacent channel power ratio of the RF front-end transmission is <-43 dBc. ③ The insertion loss of the RF front-end receiving link is <1.8 dB and the transceiver switching time is <1 μs. ④ The average throughput rate of the system is ≥45 Mbit/s, which meets the requirement of no lag in monitoring video transmission in underground coal mines. ⑤ The call quality level is ≥3, indicating that the call is relatively clear in most working hours. -
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期刊类型引用(4)
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