Experiment on through-the-earth communication characteristics of soil information acquisition sensor nodes
YU Xiaoqing1, ZHANG Zenglin2*, CHAI Rui1
1. Data Science and Technology, North University of China, Taiyuan, Shanxi 030051, China; 2. College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
Abstract:With deployment of wireless underground sensor network nodes through-the-earth communication tests on soil information acquisition sensor nodes were designed to reveal general characteristics of electromagnetic wave transmission in soil. The electromagnetic wave transmission characteristics of the sensor nodes were studied based on wheat field experiments and computer simulations by using wireless underground sensor network nodes at 433 MHz carrier frequency under various conditions such as different receiving node heights and variable node horizontal distances between transmitting and receiving nodes. A relationship model between received signal strength and packet loss rate was established, and the transmission characteristics of soil information acquisition sensor nodes in four wheat growth stages were put forward. The experiment demonstrated that when the receiving high varies the goodness of fit R2 of effect of receiving node height on RSSI shows a less variation for eight regression models, namely, the maximum R2 of RSSI is 0.998 and the minimum is 0.837; for PLR, the maximum goodness is 0.998, and the minimum is 0.900. As the node horizontal distance changes, the maximum goodness of fit R2 of effect of node horizontal distance on RSSI is 0.958, and the minimum is 0.847; for PLR the maximum goodness is 0.997, while the minimum is 0.941. The result showed that the transmissive characteristics can better predict the received signal intensity under various conditions of through-the-earth communication. The study has provided a technical support to sensor network node deployment and establishment of soil information acquisition system.
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