Diseño e implementación de un sistema de rastreo mediante GPS y la red móvil celular para aplicaciones de detección de ubicación de smart TVs robados.

Abstract

A tracking system using the Global Positioning System (GPS) and the mobile cellular network was designed and implemented to detect the location of stolen smart TVs. This involved programming Fourth and Third Generation (4G/3G) serial and mobile communication. Data is sent to Ubidots through libraries linked to the TTGO T-SIM7600G-H R2 device. This platform activates the theft alarm when the TV moves out of the predefined geofence. Alerts are sent to the Telegram chatbot. Ubidots provides an interface to visualize the position, battery percentage, connection status, and alarm. The KML button sends collected coordinates to the Telegram chatbot. Thanks to the lithium battery, coordinates are collected even without a mobile cellular network connection, regardless of whether the device is connected to the Universal Serial Bus (USB). Battery performance was evaluated, showing an autonomy of 4h:56 and a lifespan of 17 months. The system demonstrated 79,65% accuracy for outdoor coordinates within an 8-meter precisión range and 64,58% accuracy indoors within a 30-meter precision range. The Mann-Whitney U test compared Real and measured samples, concluding that the medians in both environments are equal. Modeling the Rayleigh probability density function in static indoor tracking indicated 99,90% certainty that locations remain within the geofence. Performance evaluation between events for alarm transmission showed an average delay of 25 seconds and a message reference rateo f 1,23 per minute.