中文摘要：

为解决无线传感器网络（WSN）规划与快速部署问题,基于无线信道传播特性,研究橘园WSN射频信号衰减模型,指导WSN部署并进行了组网试验。选433 MHz与2.4 GHz载波频率,基于连续无线电波在通信码率、天线增益、调制扩频方式、数据包长度和通信距离等多因素作用下分析WSN射频信号在橘园的衰减,建立2频率射频信号接收强度与环境传播因子及通信距离间的模型,拟合R2最小值与最大值分别为0.957 031与0.971 218,0.954 6与0.986 3。通信码率低于1.2 kb/s且远距离通信时,433 MHz CC1110具有优势;发射功率与天线增益相同时,433 MHz平均信号强度高于2.4 GHz;通信码率相同时,CC2530丢包率低于CC1110。针对橘园选ZigBee设计星型WSN进行组网试验,结果表明,尽可能短数据包与较低通信码率的通信协议较好;WSN各节点平均通信成功率高于84%。

英文摘要：

The layout of wireless sensor network（WSN） in citrus orchards was analyzed concerning radio frequency（RF） signal strength attenuation and packet loss rate of WSN based on radio wave propagation characteristics.Accordingly,a simply equipped WSN network was deployed and tested.The attenuation of radio wave was studied in the tests with the carrier frequencies of 433 MHz and 2.4 GHz in the circumstance of different combinations of impact factors including data rate,packet length,transmission distances,etc.The two RF signal strength linear models（433 MHz and 2.4 GHz） were built in citrus orchards with the related determination coefficients for fitting-curves ranging from 0.957 031 to 0.971 218 and 0.954 6 to 0.986 3.Signal attenuation tests showed that the CC1110（433 MHz） had a better performance in long distance communication with data rate lower than 1.2 kb/s and the average received signal strength was higher than the 2.4 GHz＇s with the same output power.While the CC2530（2.4 GHz） provided lower packet loss rate compared with the CC1110（433 MHz） in transmitting in the same data rate.For WSN configuration,short data packet and low data rate were recommended according to the test results.A ZigBee star network was constructed and experimented with the guidance provided by signal attenuation tests.Statistics showed that the average success rate for communication was higher than 84%.