School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Wollongong, NSW 2522, Australia.
Sensors (Basel). 2021 Jan 7;21(2):382. doi: 10.3390/s21020382.
In this paper, portable transceivers with micro-controllers and radio frequency modules are developed to measure the received signal strength, path loss, and thus the distance between the human ankles for both indoor and outdoor environments. By comparing the experimental results and the theoretical model, a path loss model between transceivers attached to the subject's ankles is derived. With the developed experimental path loss model, the step length can be measured relatively accurately, despite the imperfections of hardware devices, with the distance errors of a centimeter level. This paper, therefore, helps address the need for a distance measurement method that has fewer health concerns, is accurate, and is less affected by occlusions and confined spaces. Our findings possibly lay a foundation for some important applications, such as the measurement of gait speed and localization of the human body parts, in wireless body area networks.
本文开发了带有微控制器和射频模块的便携式收发器，用于测量室内和室外环境中人体脚踝之间的接收信号强度、路径损耗，从而测量距离。通过比较实验结果和理论模型，得出了附着在人体脚踝上的收发器之间的路径损耗模型。通过开发的实验路径损耗模型，即使硬件设备存在不完善之处，也可以相对准确地测量步长，距离误差在厘米级。因此，本文有助于解决需要一种距离测量方法，这种方法对健康的影响较小、准确且受遮挡和封闭空间的影响较小。我们的研究结果可能为一些重要的应用奠定基础，例如在无线体域网中测量步态速度和人体部位定位。
