Percorrer por autor "Moreira, Thiago Fernandes Moya"
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- Low cost binaural system based on the echolocationPublication . Moreira, Thiago Fernandes Moya; Lima, José; Costa, Paulo Gomes da; Cunha, MárcioUltrasonic sensors offers attractive features at an affordable cost. The main problem faced by the use of these devices is that the data obtained are not so easy to interpret , restricting their efficiency. This paper describes a binaural sensor system that is able to determine the coordinates of an object or a target in a two-dimensional space, focusing on mathematical and signal processing techniques to provide accurate measurements and increase the system reliability. The proposed work consists only of low cost components, which aims to demonstrate that improvement is possible. Experimental tests, performed in different scenarios, reported good accuracy and repeatability of the measurements.
- Low cost sonar based on echolocation: an embedded system approachPublication . Moreira, Thiago Fernandes Moya; Lima, José; Costa, Paulo Gomes; Cunha, Márcio Rodrigues daOne of the greatest challenges of mobile robot applications is obstacle detection and its localization. Most systems applied to address this problem can be branched into two segments: vision-based and non-vision based. In the former, camera detection and image processing are sensitive to variations in environmental conditions as well as their high cost. For this reason, this option is not interesting. In the second segment, on the other hand, ultrasonic sensors stand out for their attractive features at an affordable cost and, unlike other systems, are capable of operating in a variety of environments. The main problem using these devices is the difficulty of correctly handling the data acquired, limiting their efficiency. The present work focuses on the improvement and employment of a low cost location system based on ultrasonic sensors, combining trigonometric and signal processing techniques. The work is divided into two parts: processed version in MATLAB and application of embedded system. For the version in MATLAB, two optimal techniques — envelope detection and cross-correlation — were evaluated. For the embedded system approach, the technique with the best performance was implemented. In both parts, the validation of results obtained occurred through a set of measurements with various objects in assorted configurations.
- Low-cost sonar based on the echolocationPublication . Cunha, Márcio; Costa, Paulo Gomes da; Lima, José; Moreira, Thiago Fernandes MoyaIn the world of mobile robot navigation, the ultrasonic sensors stand out for presenting attractive features at an affordable cost. The main problem in the use of these devices lies in the difficulty of correctly interpreting the obtained data, which means that their efficiency is limited. This paper focuses on the improvement and implementation of a low cost location system based on ultrasonic sensors. Through the combination of mathematical techniques and signal processing it is possible to make the system more accurate and reliable. The developed system includes the data acquisition, the signal filtering, and the trigonometric methods to estimate the coordinates of a target and can be assembled in a mobile robot
- Robot@factory lite: an educational approach for the competition with simulated and real environmentPublication . Braun, João; Fernandes, Lucas de Azevedo; Moreira, Thiago Fernandes Moya; Oliveira, Vitor; Brito, Thadeu; Lima, José; Costa, Paulo Gomes daTeaching based on challenges and competitions is one of the most exciting and promising methods for students. In this paper, a competition of the Portuguese Robotics Open is addressed and a solution is proposed. The Robot@Factory Lite is a new challenge and accepts participants from secondary schools (Rookie) and universities. The concepts of simulation, hardware-in-the-loop and timed finite state machine are presented and validated in the real robot prototype. The aim of this paper is to disseminate the developed solution in order to attract more students to STEM educational program.