Measurement and Analysis of Wireless Propagation Combination Model of 433MHz and 2.4GHz in Citrus Orchards Environment

• 1、College of Electronic Engineering, South China Agriculture University

Abstract：Wireless Sensor network (WSN) has great advantage of monitoring agriculture environment, but there is difference propagation characteristic in various agriculture productions such as radio propagation path, landform, and climate. Recent researches are usually limited in specific environment, so the wireless channel model that give sufficient consideration to various propagation circumstance need to be studied to improve wireless signal transmission efficiency. In this paper, CC2530 and CC1110 were selected to measure the propagation characteristic of 2.4GHz and 433MHz frequency. The Two WSN nodes were deployed in the citrus orchard, and the Receiver Signal Strength Index (RSSI) results are recorded under the different measurement circumstance including LOS and NLOS propagation path, flat and slope, sunny day and rainy day. The new path loss combination model is proposed through traditional path loss model and rain attenuation model. Comparing the measured data, the coefficients of determination of new model are bigger than 0.9263. New wireless propagation models in citrus orchards could be used to guidance the deployment and transmission of plant information, improve the monitoring efficiency of orchard planting.

keywords： wireless sensor network wireless propagation channel model rain attenuation model citrus orchards

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