基于无线传感器网络的农田信息采集节点设计与试验(简报)

研究基于ZigBee协议的无线传感器网络技术，结合嵌入式处理器开发了无线传感器网络节点和汇聚节点。网络节点规则分布在被监测区域，负责采集土壤水分信息，并自组成网，将信息发送给汇聚节点，实现对信息的动态显示和大容量存储；节点天线分别在0.5、1.0、1.5和2.0 m 4个高度下，对小麦苗期、拔节期和抽穗期3个典型的生长时期进行试验，得出无线电信号在小麦不同生长时期，最佳天线高度下的有效传输距离，为无线传感器网络在农业中的应用提供技术支持。

Design and test of nodes for farmland data acquisition based on wireless sensor network

The wireless sensor network technology based on ZigBee protocol was researched. Some wireless network sensor nodes and a sink node based on embedded technology were designed. The nodes which acquired soil moisture information, were regularly distributed in the monitoring area. The sink node collected the information of nodes and implemented dynamic display of information and large-capacity storage. With these wireless sensor nodes, the factors of radio signal attenuation such as antenna height(0.5, 1.0, 1.5, 2.0 m) and the agricultural environment effects (wheat seeding, jointing, and heading) were studied. The relationship between optimal antenna height and radio effective range were found. These tests provide technical supports for wireless sensor network application in agriculture.