TECHNOLOGY FOR TRACKING THE MOVEMENT OF SUBSCRIBERS WITHIN THE TERRITORY OF A CRITICAL INFRASTRUCTURE ENTERPRISE

The article discusses the pressing issue of ensuring reliable positioning of subscribers at critical infrastructure facilities in conditions of possible spoofing or jamming of GPS signals. An innovative method for tracking subscriber movement using Bluetooth Low Energy (BLE) beacon technology is proposed as an effective alternative to satellite positioning. The developed system is based on a network of strategically placed BLE beacons that transmit pre-set GPS coordinates via data in advertising packets at an optimal interval of 100 ms, which ensures a balance between accuracy and energy consumption. For the practical implementation of the experiment, publicly available hardware based on ESP32 microcontrollers with built-in OLED displays was used, demonstrating the accessibility and cost-effectiveness of the solution. Specialized software was developed for transmitters (beacons) and receivers (subscribers) with the implementation of a set of positioning algorithms, including gradient descent triangulation methods, adaptive Kalman filters, and the weighted least squares (WLS) method. The system also includes a web interface for displaying results in real time and an API for integrat