Alberto Sánchez, S. Elvira, Á. de Castro, G. Glez-de-Rivera, R. Ribalda, J. Garrido
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Low cost indoor ultrasonic positioning implemented in FPGA
This paper presents a low cost indoor ultrasonic-based positioning system. This system allows the mobile nodes of a Wireless Sensor Network to know their location using radiofrequency and ultrasonics. To achieve this goal, a matrix of transmitting anchor points is installed whereas the mobile nodes receive these transmitted signals and estimate the time-of-flight of the ultrasonic signals. Using two time-of-flight measurements and trilateration equations, the location of the mobile nodes can be inferred in a 2-D space.
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