Browsing by Author "Arpi Saquipay, Braulio Vinicio"

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Análisis comparativo de algoritmos de posicionamiento para un sistema de localización basado en tecnología LoRa
(2019-04-29) Arpi Saquipay, Braulio Vinicio; Sánchez Venenaula, Christian Paúl; Vázquez Rodas, Andrés Marcelo; Astudillo Salinas, Darwin Fabián
Along the last years, we have seen a growing demand of services and systems that depend on the specific location of both people and different kinds of gadgets. For this reason, there is an interest on the development and evolution of Positioning Systems (PS) that use the Wireless Sensor Networks (WSN) to complex location services. The main aim of these PS is to estimate the relative position related to other known positions inside of a coordinate system. Currently, the Global Positioning System (GPS) offers good accuracy on location services around the world. Although it does not work effectively on applications with a high amount of small, cheap and low power requirements devices. Therefore, current researchers prefer to work on new low-cost wireless technologies; for example, WiFi, Zigbee, or LoRa. In this context, it is very important to know some fundamental aspects before of start to design a PS. For example; the architecture of the PS, sources of error; common positioning algorithms, such as ToA, TDoA, AoA, and RSSI; and common location algorithms, such as multilateration, triangulation, and trilateration. Besides, it is important to know the needs and limitations of both positioning and localization algorithms about RF features. The main purpose is to verify the feasibility of determined devices available to design and implement the PS. To conclude, this thesis project has the main aim to design and implement a low-cost PS based on RSSI positioning algorithm and trilateration location algorithm. To analyze the behavior and feasibility of both FiPy and LoPy devices with LoRa technology in location applications. Besides, the thesis evaluates a set of tests to find irregular behaviors and to mitigate these problems. As a final result provide a PS working correctly; and a comparative analysis about the accuracy error among different scenarios and similar studies.
Experimental evaluation of RSSI-based positioning system with low-cost LoRa devices
(2020) Vázquez Rodas, Andrés Marcelo; Astudillo Salinas, Darwin Fabián; Sánchez Venenaula, Christian Paúl; Arpi Saquipay, Braulio Vinicio; Minchala Ávila, Luis Ismael
Along the last years, we have witnessed the growing demand for services, applications, and systems that depend on the specific location of both people and a variety of things and gadgets. Currently, the Global Positioning System (GPS) offers good accuracy on-location services around the world. Nevertheless, it does not work efficiently on applications that require several small, cheap, and low power devices. Under such conditions, researchers prefer to work with low-cost wireless alternatives such as WiFi, Zigbee, LoRa, Sigfox, among others. The purpose of this work is twofold. Firstly we evaluate the time-measurement and radio frequency capabilities of Pycom LoRa hardware implementation, in order to develop a low-cost and GPS-independent positioning system. Then, with these results, we propose and evaluate a positioning system with LoRa technology and based on the received signal strength indicator …
Performance evaluation of RSSI-based positioning system with low-cost LoRa devices
(Association for Computing Machinery, Incacmhelp@acm.org, 2019) Arpi Saquipay, Braulio Vinicio; Astudillo Salinas, Darwin Fabián; Minchala Ávila, Luis Ismael; Vázquez Rodas, Andrés Marcelo; Sánchez Venenaula, Christian Paúl
© 2019 Copyright held by the owner/author(s). Publication rights licensed to ACM. Along the last years, we have witnessed the growing demand for services, applications, and systems that depend on the specific location of both people and a variety of things and gadgets. Currently, the Global Positioning System (GPS) offers good accuracy on-location services around the world. Nevertheless, it does not work efficiently on applications that require several small, cheap, and low power devices. Under such conditions, researchers prefer to work with low-cost wireless alternatives such as WiFi, Zigbee, LoRa, Sigfox, among others. The purpose of this work is twofold. Firstly we evaluate the time-measurement and radio frequency capabilities of Pycom LoRa hardware implementation, in order to develop a low-cost and GPS-independent positioning system. Then, with these results, we propose and evaluate a positioning system with LoRa technology and based on the received signal strength indicator. Extensive field test measurements in outdoor rural environments show that we can obtain position estimation errors lesser than around 7% of the maximum distance between anchor nodes.