Percorrer por autor "Santos, Miguel O."
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- Real Time Underwater Radio Communications in Swimming Training Using Antenna DiversityPublication . Santos, Miguel O.; Faria, Sergio M. M.; Fernandes, Telmo R.In some sports, where the athlete is training alone or far from its coach, it is often difficult to gather real-time data about the athlete's performance. Additionally, coaches also find difficult to communicate with their athletes in order to improve their training effectively. Amongst those critical sport activities, swimming is one of the most challenging, not only due to the distance between athletes and coaches, but also due to the harsh environment where the swimmers are immersed. It is known that real-time data about the swimmers training sessions, in term of biological signs and physical performance, is a valuable asset to help guiding successful training practice. Although several devices and techniques are available to monitor such data, normally the acquired data is stored in a portable device for later analysis, due to the transmission issues related to the harsh environment of the pool. Such transmission issues are often related with the location of the antenna, which is surrounded by water. In this paper, we propose a radiowave communication system, which makes use of LoRa to overcome the huge attenuation caused by the pool water. The proposed communication method, also mitigates the signal loss induced by the swimmer turns and some swimming styles. The radio communication that employs a signal frequency of 433 MHz, has been successfully tested for all swimming styles at various deepness levels in the underwater phase, with very good results in terms of received signal level and capability to maintain the radio link in multiple different conditions.
- Wearable Inertial and Bio-signal Device for Real-time Swimmer's MonitoringPublication . Santos, Miguel O.; Costa, Joana; Fernandes, Telmo R.; Silva, Catarina; Faria, Sergio M. M.There is a growing interest on wearable devices to monitor health during sport activities. These devices may be used only for monitoring purposes or allow coaches to evaluate the athlete's biological signals and physical performance. In many sports, the acquired data is available for the user, but also can be monitored in real time by the technical staff, by using some type of communication. Nevertheless, in sports like swimming commonly the acquired data is stored in the portable device and analyzed only after the training session, due to the transmission issues related to the harsh environment of the pool. In this paper we propose a novel system that allows the technical staff to monitor and analyze the swimmer's inertial (AHRS) and bio-signals (heart rate and pulse oximetry) in real time. To this aim, two radiofrequency communications systems were used, one at 5.3kHz for the heart rate sensor and another at 433MHz to communicate with the base station outside the swimming pool. This communication has been tested successfully for all swimming styles, turns and at various deep levels in the underwater phase. Additionally, a computational application shows, in real time, the sensors information, as well as few additional information processed using machine learning algorithms, like swimming style, turns, average speed and stroke counting. Unlike the common systems, the proposed device effectively yields immediate feedback to the swimmers based on the real time data analysis, which can be given by the coach or automatically by a haptic actuator in the wearable device.