Propagation characteristics of 2.4GHz wireless channel in cornfields
Propagation characteristics of 2.4GHz wireless channel in cornfields
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2.4GHz无线信道在玉米地的传播特性
DOI：
10.1109/icct.2011.6157849
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Hongju Gao
中科院分区：
文献类型：
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作者：
Siyu Li;Hongju Gao
研究农田环境中无线信道的传播特性，将为农业信息获取无线传感器网络的组网奠定基础。以玉米成熟期的农田为代表，分析了农田中无线传播的最坏情况，分析了该环境下无线信道的传播机理和影响因素。此外，在玉米地中测量了节点的功率强度、无线信号强度指示符（RSSI）和丢包率（PLR），进一步得到了节点的覆盖范围。对实验结果进行了分析，为无线传感器网络的部署提供了指导和建议。在工程实践中，节点应尽可能放置在开阔的区域，如宽阔的人行道，以最大限度地减少传播损耗，有效地增加节点的覆盖范围。天线高度选择在1.4 ~ 1.6m是比较经济可行的。此外，实验结果还验证了降雨对2.4GHz无线信号的传播没有太大影响。虽然提高发射功率可以显著增加传输范围，但必须考虑电池的功率使用和无线电监视法规。
Researches on propagation characteristics of wireless channel in cropland environments will lay the foundation for network deployments of wireless sensor network (WSN) for agricultural information acquirement. In this study, cropland with corn in maturity stage was selected as the representative of worst-case scenarios for radio propagation within cropland, and the propagation mechanisms and the impact factors on the propagation characteristics of wireless channel in this environment were analyzed. In addition, the power strength Radio Signal Strength Indicator (RSSI) and Packet Loss Rate (PLR) were measured in cornfields, and the node's coverage was further obtained. The experimental results were analyzed to provide the guidance and suggestion for the WSN deployments. In the engineering practice, the nodes shall be placed in open area such as wide walkways when it is possible in order to minimize propagation loss and increase the node's coverage effectively. And the antenna height of 1.4m to 1.6m is a good option, which will be more economic and feasible. Furthermore, experimental results also verified that rainfall doesn't have much effect on the propagation of 2.4GHz wireless signal. And although raising the transmitted power can increase the transmission range significantly, both the power usage of battery and the radio surveillance regulations have to be taken into account.