摘要
现行《辐射环境保护管理导则电磁辐射监测仪器和方法》(HJ/T 10.2—1996)中关于微波站远场区轴向功率密度的计算公式,是目前我国大多数移动通信基站在进行电磁环境影响预测与评价时所采用的预测模式。该模式适用于天线远场区轴向(即最大辐射方向)功率密度的预测,却无法直接反映天线非轴向的电磁环境影响,而在现实情况中,环境敏感点往往不会处于天线轴向。实际工作中发现利用均匀平面天线阵的方向性函数,能较好地拟合定向天线的方向性图,可将其应用于天线远场区非轴向电磁环境影响的预测与评价,但在实际应用中应该注意其仅适用于天线远场区的局限性,必要时需要根据实际情况判定其远场区范围,并结合类比监测数据进行预测结果的对比验证。
The calculation formula for the axial power density of microwave station far-field region from the current Guideline on Management of Radioactive Environmental Protection Electromagnetic Radiation Monitoring Instruments and Methods （HJ/T 10.2-1996） is the most extensively-used prediction model in electromagnetic environmental impact prediction and assessment of mobile communication base station in China so far. The prediction model is applicable to the power density prediction of the antenna far-field region in the axial direction （the direction of maximum radiation）, but could not indicate the electromagnetic environmental impact in the non-axial direction region of the antenna; however in reality the environmental sensitive sites are mostly not in the axial direction of the antenna. It is proved that the directivity function of the uniform planar antenna array is fitting the radiation pattern of the directional antenna quite well, and also applicable to the electromagnetic environmental impact prediction and assessment of the antenna far-field region in non-axial direction. However, more attention should be paid to the restriction that it is only applicable in the far-field region of the antenna, and it is necessary to calculate the boundary of the far-field region according to the actual situation, and compare and verify the predicted results with the analog monitoring data.
出处
《环境影响评价》
2015年第5期57-62,共6页
Environmental Impact Assessment
关键词
天线方向性函数
移动通信基站
电磁环境
影响预测
antenna directivity function
mobile communication base station
electromagnetic environmental
impact prediction
