TY - JOUR TI - Calibración Basada en Medidas para Modelos de Trazado de Rayos en 3D para Ambientes Exteriores Urbanos andinos JO - Sistemas y Telemática;Vol. 10, No. 21 - 2012 PB - Universidad Icesi PY - 2012 issn 1692-5238 AB - Due to the complexity of a real situation, estimation of path loss using the ray-tracing method usually assumes one or three large classes of homogeneous materials to represent the building walls, building roofs and street floors in order to have a viable model of the 3D environment. However, in a real case, an outdoor environment consists of many buildings and streets made of heterogeneous materials. Additionally, the characterizations of these classes of materials are usually taken from research of other authors with specific materials on site and often not done for the frequency band of operation. We analyze the behavior of the statistical variation of standard deviation, correlation coefficient and the average error between the values of estimated and measured path loss data when considering various values of permittivity of these three classes. Finally, we adjust the values of permittivity, obtaining a reasonable improvement of ray tracing to estimate the path-loss KW - Facultad de Ingeniería KW - Producción intelectual registrada - Universidad Icesi KW - Trazado de ciudades KW - Modelos 3D KW - Optimización KW - Calibración KW - Ingeniería de sistemas y comunicaciones KW - Telecommunication KW - Systems engineering KW - Automatización y sistemas de control KW - Command and control system KW - Hardware y arquitectura de computadores KW - Systems Application Architecture UR - http://www.icesi.edu.co/revistas/index.php/sistemas_telematica/article/view/1195 ER -