Indian Institute of Technology, Indian School of Mines (IIT-ISM), Dhanbad, Jharkhand, 826004, India.
Sci Rep. 2021 Apr 15;11(1):8231. doi: 10.1038/s41598-021-86462-1.
This proposal investigates the effect of vegetation height and density on received signal strength between two sensor nodes communicating under IEEE 802.15.4 wireless standard. With the aim of investigating the path loss coefficient of 2.4 GHz radio signal in an IEEE 802.15.4 precision agriculture monitoring infrastructure, measurement campaigns were carried out in different growing stages of potato and wheat crops. Experimental observations indicate that initial node deployment in the wheat crop experiences network dis-connectivity due to increased signal attenuation, which is due to the growth of wheat vegetation height and density in the grain-filling and physical-maturity periods. An empirical measurement-based path loss model is formulated to identify the received signal strength in different crop growth stages. Further, a NSGA-II multi-objective evolutionary computation is performed to generate initial node deployment and is optimized over increased coverage, reduced over-coverage, and received signal strength. The results show the development of a reliable wireless sensor network infrastructure for wheat crop monitoring.
本提案研究了在 IEEE 802.15.4 无线标准下，两个传感器节点之间的通信中植被高度和密度对接收信号强度的影响。为了研究 2.4GHz 无线电信号在 IEEE 802.15.4 精确农业监测基础设施中的路径损耗系数，在马铃薯和小麦作物的不同生长阶段进行了测量活动。实验观察表明，由于信号衰减增加，初始节点在小麦作物中的部署会导致网络中断，这是由于在灌浆期和物理成熟期小麦植被高度和密度的增加造成的。制定了一个基于经验测量的路径损耗模型来确定不同作物生长阶段的接收信号强度。此外，还进行了 NSGA-II 多目标进化计算，以生成初始节点部署，并针对增加的覆盖范围、减少的过度覆盖范围和接收信号强度进行优化。结果表明，为小麦作物监测开发了一种可靠的无线传感器网络基础设施。
