【摘 要】
：
In precision agriculture, near-ground radio-frequency signal isconsidered as the most promising medium to transfer agricultural information for its convenient wireless connectivity, especially in appl
【机 构】
：
College of Mathematics and Informatics, South China Agricultural University, Guangzhou, 510642
【出 处】
：
The Sixth Asian Conference on Precision Agriculture (第六届亚洲精准
论文部分内容阅读
In precision agriculture, near-ground radio-frequency signal isconsidered as the most promising medium to transfer agricultural information for its convenient wireless connectivity, especially in applications based on wireless sensor network (WSN).However, due to the complexity and variability of agricultural environments, propagation characteristics of near-ground radio-frequency signal in precision agriculture areunpredictable and unstable, which could easily result in communication failure, so propagation characteristics have become one of the most principal bottlenecks in wireless data transmission for precision agriculture.To promote the widespread development of WSN in precision agriculture, firstly, existing researchresults of propagation characteristics of near-ground radio-frequency signals in different agricultural application environments such as greenhouse, orchard and paddy field are reviewed.Secondly,models of propagation characteristics categorized froman empirical or theoretical standpoint are presented, which can be used to describe the propagation characteristics in a quantitative or qualitative way.Furthermore, according to data transmission service demands in precision agriculture, propagation characteristics of near-ground radio-frequency signals with different frequency values are compared and analyzed to provide a better choice of transmission mode for some agricultural applications.Finally, challenges of theoretical and applied research on propagation characteristics of near-ground radio-frequency signal are presented, from which researcherscan get some clues forfurther studies.The review is to provide a prospect for the research on propagation characteristics of near-ground radio-frequency signal in agricultural fields, and to give support to the widespread applications of WSN in agricultural information acquisition for precision agriculture.
其他文献
Soil electric conductivity (EC) is a property of soil that correlates with other soil properties that affect crop productivity including soil organic matter, soil texture, soil moisture content and sa
This study was carried out to use hyperspectral imaging technique to detectgrey mold disease on tomato leaves.Hyperspectral images of healthy and diseasedsamples were obtained covering the wavelengths
Citrus is one of the major agricultural products in Florida, which contributes to approximately 65% of the overall citrus production in the United States.Citrus industry plays a vital role in Floridas
The high cost of real-time kinematic (RTK) differential GPS units required for autonomous guidance has limited their use in practical auto-guided systems applicable to small-sized farming conditions.T
For South Downs, complex terrain features of small plots of farmland, This paper attempts to use hollow UAV explore new ways to sow with the appropriate parameters.The UAV body structure with 8 rotors
The quality of rice will greatly change as the time has passed by because the inner physical and chemical components are apt to be affected by the exterior environment parameters such as temperature,
Most existing image-based methods for crop disease diagnosis usually have high requirement of the input images, including simple background, sufficient depth of field, uniform illumination, etc.And be
Organophosphorus pesticide residue is a major threat for the food quality and safety, and the range is vast.Thus, the rapid detection of organophosphorus pesticide is of great importance.In the paper,
It is significantly important in practice, for both manual and GPS based autopilot operation of agricultural field machinery, to obtain optimal operation direction, route and scheduling strategies for
Adjusting the concentration of oxygen is a key factor in maintaining the quality of fresh products in transportation equipment with controlled atmosphere (CA).Liquid nitrogen injection was proved to b