大型短波广播发射台电磁辐射环境非等距网格测量法

Unequal mesh-size measurement method for electromagnetic fields environment of shortwave broadcasting station

大型短波广播台源项众多,影响区域内的电磁辐射水平分布情况复杂,目前常用的电磁辐射源环境检测方法均无法全面准确地测量出其对周边电磁辐射环境的影响情况,为此提出一种基于最大相对误差控制算法的非等距网格测量法.该方法根据大型短波广播发射台周边电磁场变化规律理论分析结果,控制网格拟合值与网格内理论计算准确值的最大相对误差,考虑现场环境对电磁场变化影响和检测点位布设可行性确定检测网格尺寸,在电磁场强度变化很大的区域采取小网格提高检测取样的抽样率,在电磁场强度变化不大的区域采取大网格降低检测取样的抽样率,不仅保证了测量结果的精准度,同时也合理地降低了实际工作量.

The conventional methods can not reflect the real influence of the short-wave antennas be- cause a shortwave broadcast station usually has many electromagnetic sources, and the distribution of electric magnetic field（EMF） in the affected area is complicated. A method using unequal mesh-size measure- ment based on maximum relative error control is proposed. According to the EMF changes nearby short- wave broadcast station and the feasibility of environment, the mesh-size of measurement is determined by the magnitude of the EMF gradient, adopting a high sampling rate by using small grids and a low sampling rate by using bigger grids. This method decreases the workload and keeps the high measurement precision. Applications prove that this method can get good agreements between measurement and theoretical calculation.