This paper presents an investigation on the effect of human presence on the indoor channel for two different UWB antennas used as Tx-Rx nodes having directional and omni-directional characteristics. The position and direction of the human subject is varied along with the Tx-Rx nodes spacing (1-5 m) giving a complete overview of the indoor channel variation in the presence of the human subject. Various links such as LOS and NLOS are formed due to the change in the position/orientation of the human subject. Channel parameters such as path loss and rms delay spread are investigated for both the UWB antenna pairs and results indicate lower magnitude for the UWB Vivaldi antenna in comparison to UWB monopole antenna due to the directional nature of the Vivaldi antenna. The UWB human-presence detection capability is also explored and validated through experiments in an indoor environment. This is based on the variations caused in the channel links or the received signal due to the presence of the human subject which is compared with the scenario when the human subject is not present. The presence of the human subject significantly effects the indoor propagation channel and the performance of the wireless sensor network. The investigations and analysis carried out will be useful for security, detection, localization and tracking purposes.

本文针对两种不同的UWB天线（具有定向和全向特性的Tx-Rx节点），对人的存在对室内信道的影响进行了研究。人体对象的位置和方向随Tx-Rx节点间距（1-5 m）的变化而变化，从而给出了人体对象在场时室内通道变化的完整概览。由于人类对象的位置/方向的变化，形成了诸如LOS和NLOS之类的各种链接。对于这两个UWB天线对，均研究了诸如路径损耗和均方根延迟扩展之类的信道参数，并且由于Vivaldi天线的定向特性，与UWB单极天线相比，UWB Vivaldi天线的幅度更低。通过在室内环境中进行实验，还探索并验证了UWB的人员存在检测功能。这是基于由于存在人类对象而在信道链路或接收信号中引起的变化，该变化与不存在人类对象时的情况进行了比较。人类对象的存在显着影响室内传播通道和无线传感器网络的性能。进行的调查和分析将对安全性，检测，本地化和跟踪目的有用。人类对象的存在显着影响室内传播通道和无线传感器网络的性能。进行的调查和分析将对安全性，检测，本地化和跟踪目的有用。人类对象的存在显着影响室内传播通道和无线传感器网络的性能。进行的调查和分析将对安全性，检测，本地化和跟踪目的有用。