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Multi sensor relay communication method for debris flow monitoring and warning based on LoRa technology

Aiming at the requirements of miniaturization and low power consumption of communication equipment for debris flow monitoring and warning, this paper proposes a multi-sensor debris flow monitoring and warning relay communication method based on LoRa technology. This method uses the advantages of LoRa technology in low power consumption and long transmission distance, and uses a high-performance RTU and multiple LoRa low-power RTUs to form a star relay communication network architecture, It can effectively reduce the overall power consumption and volume weight of wireless communication in debris flow monitoring and warning system. The high-performance RTU supports 4G, Beidou short message and other communication modes, and the low-power RTU is developed based on the low-power STM32 MCU chip and sx1278 LoRa chip, which has the advantages of small size and low power consumption. The test results show that a high-performance RTU can communicate with at least eight low-power RTUs. The communication distance between high-performance RTU and low-power RTU can reach 3.2km in intervisibility environment, and 1km in mountainous environment. The relay communication method can meet the data communication requirements of multi-sensor debris flow monitoring and warning system in mountainous areas.