Medición de componentes radioeléctricas de sistemas de radiodifusión FM y televisión (VHF) para recomendar un modelo de propagación existente a partir de la correlación de datos.

Abstract

The objective of this study was to recommend a propagation model that best fits the actual behavior of the electric field strength of FM broadcasting services and TV in the VHF band in the Lizarzaburu parish belonging to Riobamba city, for which the values of field intensity predicted by the propagation models were compared ITU-R P.525, Longley-Rice and ITU-R P.1546 with the field strength values measured with the Narda SRM-3006 meter. The measurement of the field intensity was carried out in 16 equally distributed locations for 3 different environments, 6 locations for the first environment where there was a considerable presence of vegetation, 5 locations of the second environment considered "clear" due to the negligible presence of buildings and vegetation and 5 locations of the third environment which presented buildings of considerable height and density. The GPS Mobile Mapper 50 was used to collect geographic information from the 16 locations, which was necessary to calculate input parameters needed for the models, such as effective distances and heights. The data predicted by the propagation models were obtained through the use of Matlab and Radio Mobile software. For the statistical analysis, the RMSE test using R software, the test showed that the recommendation ITU-R P.1546 best predicted the intensity of the electric field in both services, there was an error of 6.62566 and 5.28365 of the measured values with those predicted for the broadcasting service FM and television respectively. It is concluded that the model of the ITU-R recommendationP.1546 better predicts the electric field strength values for utility service FM radio and television broadcasting. It is recommended to expand the field of study, both the locations such as propagation models.