ANALYSIS OF THE EFFECTS OF GSM BANDS TO THE ELECTROMAGNETIC POLLUTION IN THE RF SPECTRUM

Abstract

In this study, electromagnetic (EM) pollution measure- ments in crowded residential areas were performed, and statistical analysis of values recorded for the EM sources causing pollution was carried out. The actual measurement values and estimated values by the analysis model obtained through the statistical analysis were com- pared. Also, amplitude ∞uctuations of the electromagnetic radiations from EM pollution sources were detected for a long time, and statisti- cal analyses were made. EM fleld levels were measured in the districts of Turkish capital, Ankara where cellular base stations and TV/Radio stations are densely populated. EM radiation levels were measured for the GSM900, GSM1800, FM, UHF4, VHF4 and VHF5 stations for certain spectrum ranges under far-fleld conditions by utilizing isotropic fleld probe and selective spectrum analyzer. The measurements were fulfllled by using NARDA SRM3000 radiation meter with isotropic an- tenna that can be utilized in 75MHz{3GHz frequency range. The ob- tained measurement levels were compared with the limit values given by International Commission for Non-Ionizing Radiation Protection (ICNIRP). The measurement results for each pollution sources were compared, and their contributions to the combined radiation were an- alyzed. The values for the EM pollution in the measurement regions were embedded over the digital maps created for the related places. During this process, comparisons of the pollution maps were made by utilizing Natural Neighbour (NN) interpolation technique.