RF Loss Model for Tree Canopies with Varying Water Content
RF Loss Model for Tree Canopies with Varying Water Content作者机构：Precision Agriculture Research Group University of New England Armidale NSW Australia College of Science and Technology Royal University of Bhutan Rinchending Bhutan Food Agility Cooperative Research Centre University of New England Armidale NSW Australia CSIRO Data61 Marsfield NSW Australia
出 版 物：《Journal of Electromagnetic Analysis and Applications》 (电磁分析与应用期刊（英文）)
年 卷 期：2021年第13卷第6期
页 面：83-101页
学科分类：08[工学] 0812[工学-计算机科学与技术（可授工学、理学学位）]
主 题：Radio Attenuation Water Content Vegetation Thickness Permittivity Path Loss
摘 要：Detection of plant water status is important for monitoring plant physiology. Previous studies showed that radio waves are attenuated when passing through vegetation such as trees, and models (both empirical and analytical) were developed. However, for models to be more broadly applicable across a broad range of vegetation types and constructs, basic electrical properties of the vegetation need to be characterised. In our previous work, a model was developed to calculate the RF loss through vegetation with varying water content. In this paper, the model was extended to calculate RF loss through tree canopies with or without an air gap. When the model was compared with the actual RF loss acquired using Eucalyptus blakelyi trees (with and without leaves), there was a systematic offset equivalent to a residual moisture content of 13% that was attributed to bound water. When the model was adjusted for the additional water content, the effective water path (EWP) was found to explain 72% of the variance in the measured RF loss.
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