Design of an intelligent sensor node based on LoRa technology

These days it is possible to apply different radio technologies for a long-range access and use the radio frequency spectrum as in the licensed part of spectrum as an unlicensed radio frequency. LoRa technology is a register trademark and title of radio access technology for design of low power wide area network at the unlicensed radio frequency spectrum 866 MHz. This paper presents a laboratory prototype of the LoRa-based sensor node device with special oriented motile antenna for the transmission of sensor data. Designed sensor node is ensure to the security requirements for data exchange between the end-node and the LoRa gateway. Designed LoRa sensor node base on the principles of software-defined radio and allows to use the open-source software and off-the-shelf hardware for data processing. As a result, the sensor node, depending on the software settings, can perform the functions of a terminal device or a gateway or server with security protocols supporting. For an increasing of the transmission stability, it is supposed to use a spatially oriented programcontrol antenna with the possibility of the optimal direction choose for a sensor data transmission. The article describes the result of the development of a sensor node based on the LoRaWAN standard, analyzes the methods and methods of ensuring information security in LoRa networks, and developed an antenna calibration algorithm to select the transmission direction between the terminal device and the gateway.