Research And Implementation Of A Thousand-meter Wireless Data Transmission Strategy

In recent years,research institutions and companies around the world pay more and more attention to the IoT application,as the related technology is developing rapidly.At present,most IoT applications use Zigbee,Wi-Fi and some other short-range wireless communication technologies.Technologies like Zigbee have its own shortages with short communication distance,complex routing and weak anti-interference ability.The wireless data transmission strategy designed in this paper can realize remote control and data acquisition,and has long communication distance,low power consumption,good instantaneity,anti-interference ability and so on.Firstly,this paper analyzes the mainstream wireless communication technologies,and do comparisons in the communication distance,speed,anti-jamming,power consumption and cost,then I select the LoRa spread spectrum technology as the basis of the text,and put forward the most suitable applications scenes for LoRa spread spectrum-remote data acquisition and control.Moreover,this paper studies and analyzes the wireless data transmission strategy based on LoRa,and designs a reliable communication protocol,an ad-hoc network protocol,and a MAC protocol for low power consumption application using star network topology.STM32F103 RBT and SX1278 are selected as the hardware platform,Contiki-a lightweight operating system is used to achieve the long-range wireless data transmission system,thus improving stability and portability of the system.In the end,this paper tests the system aiming at two kinds of application scenarios-"longdistance data transmission" and "long-distance control",the result shows that the system can upload and download data stably over 2000 meters at a rate of 1174.22 bps,and complete the ad-hoc network and do timed system wake-up and data transmission in accordance with MAC protocol,which achieves remote control and data acquisition.Compared with the mainstream technology like Zigbee,system designed in this paper has longer transmission distance,more simple structure,better instantaneity and stronger anti-interference ability.