大功率甚低频天线阵列电磁辐射安全防护距离研究

Research on the Safety Protection Distance of Electromagnetic Radiation for High Power Very Low Frequency Antenna Array

甚低频大功率通信天线通常以天线阵列形式布置在露天区域,其产生的高强辐射场会对电磁环境会造成不利影响,从而对电磁辐射控制和防护提出了新的挑战。论文仿真预测了甚低频天线阵列近场辐射场强值,构建了电磁辐射危害最小防护距离模型,并基于ICNIP-2010、BS EN62311-2008和GB8702-2014以及GJB5313A-2017,完成了甚低频天线阵列近场辐射防护距离和区域划分试验验证工作。研究结果表明:甚低频天线阵列近区综合场强值随着发射功率的增大而显著增大,其防护距离也随着发射功率和工作频率的不同而略有不同。甚低频天线150kW大功率发射时,以天线阵列地面投影点为中心,其最小安全防护距离为38.7m。40m半径范围内为作业危险区,其瞬时峰值场强远超过170V/m安全限值,人员长时活动将会对脑垂体、心肺、瞳孔等功能产生严重危害。论文的研究工作可为电磁辐射危害评估和防护控制提供有效的技术支撑。

Very low frequency(VLF)high power communication antennas are usually arranged in the open area in the form of antenna arrays.The high intensity radiation field generated by VLF will adversely affect the electromagnetic environment(EME),thus new challenges to electromagnetic radiation control and protection is proposed.In this paper,the near field radiation strength of VLF antenna array is predicted by simulation,the minimum protection distance model of electromagnetic radiation hazard is constructed,and the near field radiation protection distance and region division test of VLF antenna array are verified based on standards such as ICNIP-2010,BS EN62311-2008,GB8702-2014 and GJB5313A-2017.The result show that the combined field strength of the VLF antenna array increases significantly with the increase of transmission power,and its protection distance also varies slightly with the transmission power and operating frequency.The minimum safety protection distance is 38.7m when the VLF antenna array is transmitted at 150kW,taking the ground projection point of the antenna array as the origin.In addition,with a radius of 40m is the hazardous area for operation,and its instantaneous peak field strength far exceeds the safety limit of 170V/m,which will cause serious damage to the function of the pituitary gland,heart,lung,and pupil in the long-term movement of personnel.The research work in this paper can provide effective technical support for assessment of electromagnetic radiation hazard and protection control.