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Spanish to English: Planificación de mediciones GPS-RTK basada en análisis espacial y modelos de propagación de ondas. LGFS-LUZ, Octubre 2006.
Source text - Spanish RESUMEN
Este Trabajo Especial de Grado propone una metodología para la planificación de mediciones GPS RTK, que considere predecir la cobertura de la transmisión de datos vía radio UHF, de manera que se utilice como instrumento guía en la ejecución de proyectos GPS-RTK. Se estudió y comparó la propagación de ondas bajo diferentes modelos, en zonas de topografía irregular, con el fin de crear una herramienta que permitirá realizar simulaciones de enlace de radiofrecuencias. Se desarrolló la herramienta de propagación Calc Señal, en el ambiente programático del software ArcGIS, que realiza combinaciones de pérdidas básicas similar a los modelos Free Space + RMD, JRC y Blomquist-Ladell, sin considerar el efecto de la difracción. Para validar la predicción, se realizó una estimación de la señal recibida en un área de prueba con el modelo Calc Señal y se comparó con el software Radio Mobile, usado como control. Ambas predicciones se compararon con resultados en campo de una campaña de medición GPS RTK utilizada como prueba. Como apoyo al análisis de pérdidas en la propagación, se determinaron superficies de viewshed con línea de vista despejada hasta el 60% de la primera zona de Fresnel. Se estudió la relación entre la capacidad de realizar mediciones, el despejamiento de los perfiles y las estimaciones de señal recibida y se determinó que con la estimación de la señal y el análisis de visibilidad, es posible predecir el enlace en campo. Se estimó que Calc Señal es rendidor sólo en perfiles sin obstrucciones, mientras que Radio Mobile realiza predicciones de señal efectivamente en topografía irregular, razón por la que se recomienda incluirlo en la metodología de planificación GPS-RTK. Finalmente se define un método de planificación para optimizar la ejecución de mediciones GPS-RTK usando radio UHF.
Palabras clave: propagación, GPS-RTK, difracción, zona fresnel, análisis espacial
Translation - English ABSTRACT
This Degree Thesis Project proposes a method for GPS-RTK survey planning, which takes into consideration a coverage prediction of the UHF radio data transmission to be used as a guide for the development of GPS-RTK projects. Wave propagation in areas of irregular terrain was studied and compared using different models to create a tool that allows a simulation of radio frequency links. The propagation tool Calc Señal was developed under the programming environment of ArcGIS, which combines basic propagation losses in a similar way as the Free Space + RMD, JRC and Blomquist Ladell models, but without considering the diffraction effect. To validate the prediction, an estimation of received signal was performed on a test area with the Calc Señal model, and compared with the software Radio Mobile, used as a control. Both predictions were compared with field results of a GPS-RTK survey campaign used as a test. As a support of the propagation loss analysis, viewshed surfaces for clear line of sight up to 60% of the first Fresnel zone were calculated. The relationships between the ability to perform surveys, the profile clearance, and received signal predictions were studied, and it was determined that a radio link on field can be predicted with signal prediction and viewshed analysis. It was further found that Calc Señal is reliable only in profiles without obstructions; meanwhile Radio Mobile generates signal predictions effectively in irregular terrain, reason why is recommended it be included in the GPS-RTK planning method. Finally the planning methodology is defined to optimize the performance of the GPS-RTK surveys using UHF radio.
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I am a Geodetic Engineer native of Maracaibo, Venezuela and recently started working as a part-time English-Spanish-English free-lance translator. I have lived in Venezuela and the United Sates, where I became bilingual and bicultural. My job working offshore, where I sometimes function also as an interpreter, keeps me fluent in conversation and updated with the industry´s vocabulary.
I have one year of experience translating marine positioning and navigation reports for the Oil & Gas industry as well as interpreting onboard marine operations. I also have worked translating research projects for Geodetic and Remote Sensing studies for a University research lab.
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