暴露于多个电磁源的评估指南

[中文适用范围]： 本技术报告描述了由于同时暴露于多个窄带电磁（EM）源而引起的空间区域和居住者的总体暴露水平的暴露评估概念和技术。在本技术报告中，假设曝光评估在静态条件下进行，即被测设备的源位置和发射模式特性（例如发射功率、调制方案等）不会发生显着变化使用所选评估技术（例如现场测量）进行评估所需的时间。全世界绝大多数无线通信系统采用以窄带波形为特征的信令方案，窄带波形在下文中被定义为占据不宽于其中心频率的10%的频带的信号波形（下面提供了该阈值的理由）。作为参考，附件 A 介绍了几种常见无线服务的操作系统频段和信道带宽。宽带通信系统，例如采用分数带宽远超过 10% 的脉冲波形的超宽带 (UWB) 系统，对于市场而言相对较新，迄今为止的部署有限，并且通常不被视为重要贡献者由于发射功率水平较低而导致电磁暴露水平。 [外文原描述]： IEC/TR 62630:2010(E) describes exposure evaluation concepts and techniques for the overall exposure level in spatial regions and occupants caused by the simultaneous exposure to multiple narrowband electromagnetic (EM) sources. Throughout this Technical Report, it is assumed that the exposure evaluation occurs under static conditions, i.e., the source position and transmit-mode characteristics (e.g. emitted power, modulation scheme, etc.) of the device(s) under test do not vary significantly over the time required to carry out the evaluation using the chosen evaluation technique (e.g., field measurements). IEC/TR 62630:2010 provides guidance to IEC TC 106 project teams on how to evaluate the combined exposures from multiple electromagnetic (EM) sources in the frequency range 100 kHz to 300 GHz when specific absorption rate (SAR) and equivalent power density (S) are the relevant exposure metrics, as defined by the main international guidelines recommending limits on human exposure to EM fields.