Avaliação da localização baseada no Round-Trip Time of Flight para diferentes modelos de mobilidade em redes Wi-Fi

Abstract

Due to the current advancement of technology, it is evident the need for localization systems so that innovations such as autonomous vehicles can perform their tasks more efficiently. Consequently, there are several methods to locate a device, and the most common is the GPS. However, there are some limitations that are noticed mainly in complex environments or when the object to be located is in motion, for these cases it is necessary to use an alternative way. Thus, RTOF (Round-Trip Time of Flight) method can be highlighted, which is based on the time of departure and arrival of messages to estimate the position, being the purpose of this work to analyze its performance for different mobility models as the speed of movement varies for the sender node and with variation of the number of receiver nodes. These evaluations were performed through the OMNeT++ simulator where is possible to create WLAN networks and to configure the various types of scenarios that were used to perform the experiments. In addition, the Maximum Likelihood Estimation technique was used to calculate the trilateration. Therefore, the results of the evaluation of the RTOF algorithm in conjunction with MLE in a simulation environment show that the type of movement that the sender node performs does not interfere with the position estimation, unlike the speed and amount of nodes that clearly impacted the position estimation of the sender node.