基于LoRa的活立木阻抗测量系统  

Impedance Measurement System of Living Tree Based on LoRa

作　　者：周游 范屹帆 吴寅 ZHOU You;FAN Yifan;WU Yin(College of Information Science and Technology,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]南京林业大学信息科学技术学院,江苏南京210037

出　　处：《无线电通信技术》2023年第1期193-200,共8页Radio Communications Technology

基　　金：国家自然科学基金(32171788,31700478);江苏省政府留学奖学金(JS-2018-043)。

摘　　要：活立木的阻抗可以反映出活立木的健康状态,针对林业物联网中的活立木阻抗测量成本高、不方便、实时性差的问题,设计了一种基于LoRa的活立木阻抗测量系统。系统利用STM32芯片,外设AD5933通过量程自动切换算法采集活立木的阻抗数据,使用LoRa通信将所采集数据通过SX1267芯片发送到接收端。上位机软件接收后,利用卡尔曼滤波算法对同一批数据进行滤波处理,得到最终的阻抗值,以方便监测活立木的健康状况。经过与市场主流测试仪进行测试对比表明:该系统的测量精度接近0.05%,可以准确测量出活立木的阻抗。研究结果为活立木健康监测中的活立木阻抗测量提供了一种低成本、易操作及时效性强的实施方案。The impedance of living trees can reflect the healthy state of themselves.Aiming at the problems of high cost,inconvenience and poor real-time performance,this paper designs a living tree impedance measurement system based on Lora.The system uses STM32 chip,peripheral AD5933 to collect impedance data of living trees through automatic range switching algorithm,and uses Lora communication to send the collected data to the receiving terminal through SX1267 chip.After the upper computer software receives the data,the Kalman filter algorithm is used to filter the same batch of data to obtain the final impedance value,so as to facilitate the monitoring of the health status of living trees.Compared with the mainstream testers in the market,the measurement accuracy of the system is close to 0.05%,and the impedance of standing trees can be accurately measured.The research results provide a low-cost,easy operation and time-effective implementation scheme for the impedance measurement of living trees in the health monitoring of living trees.

关 键 词：LoRa AD5933 活立木阻抗监测 卡尔曼滤波 

分 类 号：TN98[电子电信—信息与通信工程]