Abstract: With the rapid development of the Internet of Things and wireless sensor networks, the application of wireless sensor network which based on the Received Signal Strength Indicator（RSSI） has become a hot research area. In the underground tunnel, wireless signal transmission will be susceptible to multipath, reflection, diffraction and interference of tunnel walls, consequently makes it difficult to be accurately detected. In order to accurately analyze the features of the underground radio signals, the group deploys a wireless sensor network with multiple network node, which based on a practical underground condition, and analyzes various features of the RSSI in this case by a large number of experiments, a large amount of collected data. The experimental results show that the RSSI underground can also has high stability, the mean error of ranging is about 0.8 m. Therefore, the ranging technology based on RSSI underground is feasible.

Key words: wireless sensor networks, Received Signal Strength Indicator（RSSI）, ranging, underground tunnel, performance analysis

摘要： 随着物联网和无线传感网络的飞速发展，基于接收信号强度（Received Signal Strength Indicator，RSSI）的无线传感网络应用成为研究的热点。在井下巷道环境中，无线信号传输容易受到多径、反射、衍射和巷道壁的干扰，从而使其很难被准确地预测，为了准确地分析井下环境中的无线信号特性，基于一个实际的井下环境，部署了一个包含多个网络节点的无线传感网络，通过大量的实测实验，采集了大量的数据，分析了RSSI在井下环境中的各种特性。实验结果表明：RSSI在井下环境中也能具有较高的稳定性，其测距的平均误差在0.8 m左右。因此，在井下采用基于RSSI的测距技术是可行的。

关键词: 无线传感网络, 接收信号强度, 测距, 井下巷道, 性能分析