Diseño y evaluación de un sistema de posicionamiento Indoor basado en tecnologías RFID y WIFi para personas con capacidades especiales.

Abstract

The objective of this research work was to design and evaluate a positioning system Indoor Based on RFID and WIFI technologies for people with special abilities, for which it had to investigate, analyze the WIFI and RFID technologies that were used for the design and implementation of the prototype. . The system consists of an RFID tag with its respective reader, three access points, a mobile device with client applications and samples taking installed and finally a computer with the location server and the database. The location server performs the search request of the user and to obtain a result it uses the WKNN algorithm that compares the power levels previously stored in a database collected by the application, taking samples with those emitted at that moment by the mobile device that the user carries out joint with an RFID card that allows us to decrease search parameters such as time and physical space within the system. In this way, it is possible to choose between the most similar levels and display the point of location of the devices carrier. The fingerprinting technique was used for its low level of complexity, in addition to the programming languages Visual C# and Android Studio, as well as the use of PostgreSQL for the development of the database. With the implementation of the prototype, it was possible to validate the system by means of performance tests, determining that when using WIFI and RFID together, the accuracy level of the positioning calculation is relatively greater than when using them in isolation, obtaining an accuracy average of 0,658 m with respect to the real position of the user. It is concluded joint use of the two mentioned technologies is possible, which its implementation is recommended, due to its low cost and favorable results.