稻田水分监测无线传感器网络优化设计与试验

传感器网络技术为大范围稻田水分信息采集提供了一种新技术手段。利用测量稻田水分含量和水层深度测量的无线传感器WFDMS，探讨了构建稻田水分传感器网络PMSN的关键技术：设计了大面积、大范围应用体系结构模型；提出了一种满足稻田水分采样频率和数据业务需求的低功耗传输控制协议LPTP-PMSN；开发了水分信息监测信息管理系统，实现了完整运行的稻田水分传感器网络整套系统。试验表明，PMSN网络在稻田中的可靠通信距离达60 m，在 3.6 V/2 100 mAh电池供电下，4 h周期采样试验中，在传输协议LPTP-PMSN控制下，传感器、簇首、基站、短信网关、计算机间能够协同工作，整个稻田水分传感器网络可以较可靠运行，节点生命期超过190 d。该研究可为农用信息监控无线传输网络的其他应用提供参考。

Design and experiment of wireless sensor networks for paddyfield moisture monitoring

Wireless sensor network technology provides a new measure for moisture information collection in large-scale paddyfield. In this study, the key technology of constructing the paddy moisture sensor network (PMSN) was investigated based on the wireless moisture-content and water-layer sensor (WFDMS). Several key technical issues in building PMSN were solved and a large-scale remote topology management program was constructed. A low power loss transfer protocol for PMSN (LPTP-PMSN) was proposed. Finally, a network information management system was developed to monitor and analyze the moisture information. Experiments results showed that the reliable communication range among the senor nodes was up to 60 m. Supported by the 3.6-volt 2100 mAh batteries, under the control of the transfer protocol LPTP-PMSN, the sensors, cluster head, base stations, SMS gateway and computer worked collaboratively and the whole paddy moisture sensor networks could work together reliably. The node lifetime can be over 190 d under the sampling intervals of 4 h. This research can provide a reference for monitoring other fields sensitive information based on wireless transmission networks.