短波广播发射台电磁辐射环境影响分析

Environmental impact analysis of electromagnetic radiation of shortwave broadcast transmitting station

本文分析了短波广播发射台系统的组成、原理及发射特点,对典型短波广播发射天线周围不同方位、不同距离、电磁辐射环境敏感目标不同楼层等点位进行了监测,并在对监测结果进行分析的基础上,提出了短波广播发射台电磁辐射环境监测管理相关建议。研究得出以下结论:对短波广播发射台最大辐射方向进行最大场强断面监测,即可掌握短波广播发射台周边的最大场强分布及影响情况;在进行断面监测时,出现部分点位场强突然变高的情况,但整体趋势是随着距天线的水平距离增加而减小,因此在进行现场监测时需要选择空旷平坦的地面,避免因树木或地势高低而影响监测结果;在多层敏感目标建筑物内进行监测时,随着楼层的增加其电场值逐渐变大,因此需考虑场强在不同楼层的分布情况。

This paper mainly analyzes the composition, principle and transmission characteristics of the shortwave broadcasting transmitting station system, and conducts test monitoring on different positions, different distances, and different floors of electromagnetic radiation environment sensitive targets around the typical shortwave broadcasting transmitting antenna.Finally, based on the analysis of the monitoring results, a feasible proposal for the electromagnetic radiation environmental monitoring management of the short-wave broadcasting transmitting station is put forward.The study draws the following conclusions: the maximum field strength profile monitoring of the maximum radiation direction of the short-wave broadcasting transmitting can grasp the maximum field strength distribution around the short-wave broadcasting transmitting station and its influence;during cross-sectional monitoring, some point field strengths appear suddenly increase, but the overall trend is to decrease as the horizontal distance from the antenna increases.Therefore, it is necessary to choose an open and flat ground during on-site monitoring to avoid affecting the monitoring results due to trees or terrain;when monitoring in the target building, the electric field value gradually increases with the increase of floors, so the distribution of field strength on different floors needs to be considered.