基于780MHz频段的农田信息采集无线传感器网络设计.docx

1000 -2340( 2017) 01 -0060 -06DOI:IO. 16445/j.cnki.1000-2340.2017.01.011Design of wireless sensor network for field information acquisition based on 780 MHzZHENG Baozhoul ,LlFuqiangl , WU Lili l , YUAN Shuai2 , LIN Aiyingl , TENC Honglil , DOU Genshengl, YUAN Chao( l. College of Sciences, Henan Agricultural University , Zhengzhou 450002, China;2. College Of Mechanical and Electrical Engineering, Sichuan Agricultural University, Ya an 625014, China)Abstract: A new type of wireless sensor network was developed with chips of MSP430F5438A and AT86RF212 which works on a Chinese dedicated band Of 780 MHz and is compatible with the standard of IEEE802. 15. 4c for field information acquisition. This paper briefly described the structure of wire— less sensor network node, mainly introducing the hardware design of a 780 MHz wireless sensor net— work. The choice and index parameters Of sensor for soil moisture / temperature , air moisture/ tempera— ture and illuminance were listed. The paper also tested and analyzed the received signal strength index ( RSSI) and the average packet loss rate ( PLR) of the wireless sensor network node in 433 MHz, 780MHz, and 2.4 GHz bands by changing the wireless communication distance in a wheat field of eastern Henan plain as the experiment-dl environment. The experimental results showed that the transmission characteristics of the wireless sensor networks in the 433 MHz and 780 MHz bands were obviously bet— ter than the WSN of a 2.4GHz band in the application of field environmental monitoring. The 780 MHz band WSN was even superior as to transmission and communication quality performance, and couldE ( KJCX2015A17)1979 -j meet the demand Of field information reliable transmission.Key words: field information acquisition; wireless sensor networks; 780 MHz band; receivedsignal intensity精细农业需要高速度、高密度、高准确度的农田信息作为实施依据，农田信息的远程获取成为精细农业实施中的关键环一卩。无线传感器网络（Wireless Sensor Network，WSN)作为一种全新的信息获取和处理技术，具有低成本、低功耗和高可靠性的优点，国内外已有研究人员将WSN应用于农田信息采集，并取得一定进展〔2引。史兵