城市射频公众曝露区域监测最优网格尺度研究
Study on optimal grid scale for regional monitoring of urban radio frequency public exposure
摘要 采样密度最优化是当前区域环境监测的难点问题,然而对区域射频公众曝露监测的最优尺度研究仍处于空白.该文以江苏省南通市为例,采用新型车载监测技术对城区区域射频公众曝露进行现场实测,构建3种网络分布特征.研究结果显示,2 km×2 km尧1 km×1 km和0.5 km×0.5 km这3种网格尺度所得南通城区平均电场强度分别为(0.56±0.24)V/m尧(0.57±0.27)V/m和(0.56±0.31)V/m,其中以1 km×1 km测试值最接近总体均值.经Cochran理论计算法验证,研究区域至少需要1 km×1 km网格密度的采样尺度下,相对误差为10%,才满足Cochran公式获取的最佳采样网格数量.因此,1 km×1 km网格是以南通市为代表的我国II型大城市城区环境射频电磁辐射测试的最优网格尺度.
Abstract:
The optimization of sampling density is a difficult problem in current regional environment monitoring. However, the research on the optimal scale of radio frequency public exposure regional monitoring is still in the blank. Taking Nantong city of Jiangsu Province as an example, the paper conducts field measurement of urban radio frequency public exposure with a new vehicle-mounted monitoring technology and constructs three kinds of network distribution characteristics. The results show that the average electric field strength of the city of Nantong, in terms of three grid scales, i.e. 2 km×2 km, 1 km×1 km and 0.5 km×0.5 km, are (0.56±0.24)V/m, (0.57±0.27)V/m and (0.56± 0.31)V/m respectively, of which the value measured under 1km×1km is close to the overall mean value most. With the Cochran theoretical calculation method, it is proved that the optimal sampling grid number obtained with the Cochran formula can only be realized when the relative error is 10% under a grid density of at least 1 km×1 km. Therefore, the grid of 1 km×1 km is the optimal grid scale for the environmental radio frequency electromagnetic radiation measurement in the urban area in type II big cities represented by Nantong in China.
Author: WU Panfeng LU Wei YAO Ying WANG Guoqi HUANG Xin
作者单位: 南通市环境监测中心站,江苏 南通,226006 江苏省核安全局,江苏 南京,210019
刊 名 中国测试 ISTICPKU
年,卷(期): 2017, 43(8)
在线出版日期: 2017年9月22日
基金项目: 江苏省环保科研项目,南通市科技计划项目