This paper presents a study of university social responsibility (USR), carried out through an innovative educational action. The students of the studied classrooms in the University of the Basque Country (UPV/EHU) collaborated with a social entity Emmaus Social Foundation dedicated to environmental sustainability, social justice and the social and solidarity economy to provide community services through a service-learning methodology. Using a mixed method approach, we combined the practical experience of the social entity with an active student-centred teaching methodology in order to foster the acquisition of general and specific competencies related to sustainability and social justice. The aim was to create learning connections between members of the university community and links with the environmental and social reality of the Basque Country. This pilot study was carried out in the first term of the 2018–2019 academic year. This work allowed (a) critical knowledge to be generated by incorporating and hybridising discussion elements of social justice, such as sustainability; (b) intergenerational participation processes to be generated between elders, university students and social organisations in order to acquire general and specific learning competencies and (c) social and environmental needs to be addressed through community services. Keywords: Higher education, intergenerational learning, service-learning, teaching innovation, university social responsibility.
Abstract-The standard positioning service (SPS), or undifferentiated measurements contains errors in its measurements affecting the final positioning solution of the receiver. The application of GPS differentiation techniques in simple (SD) and double (DD) configuration allow to eliminate errors that affect the GPS signal during to propagation path, among the most critical, are errors produced by the atmosphere and troposphere. Between the reference receiver and the mobile GPS receiver (rover) exist errors correlated in time and space according to the distance between them, the elimination of common errors increases the accuracy of the final solution. The application called DGPS-Lab is designed to execute the process of differentiation in both configurations and verify the results by minimizing the errors in the positioning through the implemented DGPS algorithm.Index Terms-GPS, DGPS, Raw Data, single difference, double differences.Resumen-El servicio de posicionamiento estándar (SPS), o medidas sin diferenciar, contiene errores en sus medidas que perturban en la solución final de posicionamiento del receptor. A través de la aplicación de técnicas de diferenciación de GPS en configuración simple (SD) y doble (DD) es posible la eliminación de errores que afectan a la señal de GPS en el trayecto de propagación, se considera los más críticos a los errores producidos por la atmósfera y tropósfera. Entre el receptor de referencia y el dispositivo receptor GPS móvil (rover) existen errores correlacionados en tiempo y espacio de acuerdo a la distancia que exista entre éstos. La eliminación de errores correlacionados incrementa la precisión en la solución final. Se diseña la aplicación denominada DGPS-Lab creada para ejecutar el proceso de diferenciación en ambas configuraciones y verificar los resultados al minimizar los errores en el posicionamiento a través del algoritmo de DGPS implementado. El principio de funcionamiento consiste en utilizar un receptor de referencia de coordenadas conocidas y de un receptor de usuario (rover) para que a través de la diferenciación de sus medidas se elimine errores correlacionados en espacio y tiempo [2], con excepción a los errores de multipath por ser errores locales y exclusivos de cada receptor. Palabras Claves-GPS, DGPS, DatosSe considera errores correlacionados entre receptores si la distancia entre ellos alcanza a los cientos o miles de kilómetros, así los errores provocados debido a la ionósfera, tropósfera y errores debido al reloj del satélite son mitigados con la utilización de la diferenciación simple (SD), de la misma manera la diferenciación doble (DD) reduce errores producidos debido al reloj del receptor [2]. Con el fin de disminuir estos errores, existen varias técnicas de corrección que incluye la transmisión de las correcciones en tiempo real y por postproceso. El alcance de este documento se enmarca en el desarrollo del algoritmo que permita ejecutar el diferencial de GPS mediante el uso de las medidas de código de un receptor GPS de bajo costo al considerar la ...
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