Research On LoRa Based Data Transmission Technology In Agricultural Internet Of Things System

With the rapid development of China's agricultural modernization,the application of Internet of Things technology in agricultural systems is becoming more and more extensive.The application technologies in today's intelligent agricultural IoT system include WiFi,ZigBee and other short-range wireless network technologies.For the complex agricultural environment,there are some problems with the above technologies.This paper finally compares the advantages and disadvantages of various wireless technologies and finally determines the design of the agricultural Internet of Things system in conjunction with LoRa.The main work content is as follows:1.To study the current research situation of agricultural Internet of Things and LoRa wireless communication at home and abroad,clarify the technical advantages of LoRa and propose to apply LoRa technology to agricultural Internet of Things systems.2.An overview of the overall framework of the Agricultural Internet of Things,focusing on cloud platforms and wireless sensor networks,highlighting the advantages of LoRa technology through the development of wireless sensor networks.3.Introduce the key points of LoRa technology in detail,including LoRa's spread spectrum communication mechanism and key parameter settings.4.Through the establishment of the overall framework of the system,the chip selection is carried out,then the schematic diagrams of the gateway and the node is drawn through the design requirements,and finally the layout and wiring are made according to the requirements and the PCB board is made.5.The software part mainly provides a solution to the problem of information collision of the communication process of LoRa.It uses the time-division multiplex method to solve the problem and improves the time-division multiplex method.Finally,it is compared with the CSMA method and concluded: Time-division multiplex can better solve the collision problem.6.The actual test of the entire system and analysis of the experimental results,the test shows that the communication distance.In terms of packet loss rate,power loss,etc.,the system has achieved the expected design goals.It proves that LoRa has a very good application prospect in the agricultural Internet of Things.