Detecção e estimação da posição de pessoas em ambientes internos a partir da análise espectral de sinais PLC

Abstract

This dissertation investigates the possibility of detecting the presence of people in indoor environments and determining their relative positions through the magnetic coupling between these individuals and power lines. The study is based on analyzing the alterations caused by the presence of people in the channel response when these lines are used as a transmission medium. The proposed approach involves measuring and analyzing the behavior of OFDM carriers in data transmissions conducted via Power Line Communication (PLC) systems, with and without people present in the environment. This enables the assessment of the impact of the interaction between the power lines and the bodies in the space, which, in this case, corresponds to a classroom. The observed effects of this interaction can be used as indicators for the passive detection of people in indoor environments, without requiring any active participation from the target. The experimental infrastructure was designed and set up in a classroom, allowing for data collection under controlled conditions. The analysis of the collected measurements shows that the passive detection of people, based on changes in the PLC channel, is feasible. Moreover, the results indicate the potential for estimating the relative positions of the occupants within the environment.