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Resumo. O aumento da utilizacao de redes sem fio, abre perspectivas no campo de pesquisas e aplicacoes baseadas nessas redes. Uma classe de aplicacoes desse tipo e composta por sistemas de localizacao que se propoem a identificar a posicao geografica do usuario, em tempo real, atraves de dispositivos sem fio. Neste artigo e apresentada a proposta de um sistema de localizacao em tempo real baseado em redes Wi-Fi. O sistema e baseado no cadastro de comodos, que servirao como referencias para a coleta previa desinais RF de pontos de acesso nesses comodos e a posterior localizacao do terminal. O algoritmo de localizacao implementado emprega como padrao de referencia as medias dos sinais coletados. Essas medias sao comparadas aos sinais de RF recebidos pelo equipamento de forma a estimar a localizacao do dispositivo sem fio, em tempo real. O sistema foi implementado sobre o sistema operacional Linux, utilizando a linguagem C e a biblioteca grafica GTK. Abstract. The increase in the use of wireless networks opens perspectives, both for research and applications based on these networks. One class of such applications consists of positioning systems which aim at estimating the user's geographic position in real time via wireless devices. In this paper, we propose a system for real-time location based on Wi-Fi networks. The system is based on the registration of rooms, which are used as references in the process of collecting RF signals levels received from neighboring access points by a Wi-Fi terminal in each room. The gathered data is then used for estimating the location of the terminal among the known references. The location algorithm implemented uses as a benchmark the averages of signal levels collected from the different access points that are available. These averages are compared to the RF signal levels received by the equipment in order to estimate its location in real time. The system was implemented on the Linux operating system, using the C++ language and the GTK graphics library.

Um Sistema para Localização em Tempo Real de Terminais Wi-Fi em Ambientes Indoor