Research On Base Station Electromagnetic Radiation Measuring Method And Uncertainty Of Measurement

The principle of co-construction and sharing of base stations increases the utilization rate of site resources,easy to communication facilities construction,maintenance and network expansion,but also brings a single physical site of the radiation level will greatly improve or even there is a problem beyond the hidden dangers.Many complaints and disputes caused by base station electromagnetic radiation have occurred,the base station constructed in residential area and other sensitive area is often obstructed by the public,and even some base stations were forced to dismantle.On the other hand,traditional base station electromagnetic radiation measuring method can not fully meet the measurement requirements of various types of base station antennas,and lack of measurement uncertainty analysis.Faced with these problems,based on the traditional antenna electromagnetic radiation measuring method,according to the characteristics of different types of base station antenna design measuring layout scheme,select appropriate measuring method and assess the measurement uncertainty is necessary.In this paper,based on the traditional antenna electromagnetic radiation measurement method,designing measurement layout scheme for smart antenna and indoor distribution system.Proposing the measurement scheme of smart antenna in different beam forming mode.The DOA estimation of MUSIC and Capon and beam forming simulation are realized by MATLAB,the DOA estimation and beam forming technology are used to complete the design of the measurement layout scheme in traffic beam mode..Two schemes are proposed in the broadcast beam mode.According to the antenna type of the indoor distribution system design the three kinds of measurement layout scheme.Based on GUM,analyzing the uncertainty sources of electromagnetic radiation measurement of base station in detail,generalizing and classifying the class B uncertainties of broadband measurement and frequency measurement.Based on the theoretical layout scheme and principle,combined with actual environment,designing measurement layout scheme,measured by broadband or frequency measurement of its electromagnetic radiation level,and the uncertainty of the measurement method are evaluated based on the measurement results.The measurement results show that the electromagnetic radiation level of the measured base station is in line with the national standard.The uncertainty of measurement depends on the uncertainty of class B,and the contribution of class A uncertainty to the standard uncertainty is small.