Abstract
For more than a year now, the Radio GIS Research Group, assisted by the Schools of Electrical, Electronic and Telecommunications Engineering (E3T) at UIS, together with other local research groups (i.e. ICESI´s I2T, UFPS’s GIDT, and UDI’s MAXWELL, and the Colombian Ministry of Communications have been conducting a number of studies on high-frequency electromagnetic radiation under outdoor conditions to determine acceptable human exposure levels to this kind of radiation. These studies are driven not only by academic interest in this subject, but also by concerns raised by communities in the city of Bucaramanga and other regions in Colombia with respect to the installation of a large number of radiocommunications stations. With this paper, the Radio GIS group makes some contributions, which will hopefully benefit both the population in general and the regulatory agencies, aiming at establishing control policies based on concrete theoretical and technical studies. The results of the studies discussed in this paper derive from previous research conducted in the field of electromagnetic propagation. They were extrapolated to new research studies on sectorized radio bases under Andean region conditions. Based on modern simulation and measurement methods to determine the coverage areas and radiation levels generated by cellular systems which are now operating in Colombia at frequencies of 800 MHz and 1,900 MHz (i.e. CDMA2000.1x, TDMA/IS-136 and GSM 800 and 1900 Standards), safe human exposure levels and limits were calculated efficiently. In addition to this, this paper presents the results and relevant analysis of the main commercial frequencies on the radioelectric spectrum which are considered critical to the safety of the general public (i.e. AM, FM, TV, 300MHz, and cellular frequencies) based on readings taken in the field. This is intended to make a comparison of the percentile and specific radiation of mobile phone and PCS systems against international standards. These studies were conducted in cooperation with the Bucaramanga Regional Management Division of the Ministry of Communications, which made available their spectrum monitoring systems.
Highlights
The results of the studies discussed in this paper derive from previous research conducted in the field of electromagnetic propagation
This paper presents the results and relevant analysis of the main commercial frequencies on the radioelectric spectrum which are considered critical to the safety of the general public (i.e. AM, FM, TV, 300MHz, and cellular frequencies) based on readings taken in the field
RESUMEN Desde hace más de un año el Grupo de Investigación RadioGIS, apoyado por la Escuela de Ingenierías Eléctrica, Electrónica y Telecomunicaciones-E3T- de la UIS, junto con otros grupos de investigación del país (i.e. I2T-ICESI, GIDTUFPS y MAX WELL-UDI) y el Ministerio de Comunicaciones, vienen realizando estudios sobre las irradiaciones electromagnéticas en ambientes abiertos a altas frecuencias y sobre los niveles aceptables de exposición a estas irradiaciones para los seres humanos
Summary
Potencia, campo, restricciones, niveles, referencia, contribución, banda ancha, zonas, sectorización, medidas, polarización, algoritmo, modelo, Walfisch, Ikegami, COST231, GIS, propagación, path loss, relieve, andino. El trabajo realizado y sus futuros avances se presentan como una propuesta para el desarrollo de una plataforma base que supla las necesidades básicas del Ministerio de Comunicaciones de Colombia en cuanto a la predicción de Áreas de Servicio y estimación de Densidades de Potencia (para consideraciones ambientales en cuanto a emisiones de campos electromagnéticos), que luego será complementada con trabajos que incluirán la aplicación de algoritmos específicos para otras bandas del espectro radioeléctrico, tanto para el cálculo de pérdidas por propagación, como para la estimación de interferencias, análisis de capacidad, estimación de niveles de irradiaciones y configuraciones de campo cercano y lejano en sistemas de baja frecuencia. En el plano investigativo se puso en práctica el algoritmo de predicción ajustado en la UIS en el año 2002,11,12,13 pero en esta ocasión en condiciones de celda sectorizada con el fin de estimar las pérdidas de señal y corroborar los niveles de densidad de potencia tomados como referencia en la reglamentación internacional para los sistemas que funcionan en la banda de 400-2000MHz.[25]
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