基于智能手机传感网的室内老年监护系统平台

Indoor monitoring platform for aged people based on smart phone sensor network

针对老年人监护需求的日益增长,提出了一种基于手机麦克风传感网络的监护平台设计。该平台利用搭载麦克风的智能设备进行音频信号采集,以Wi-Fi作为基础网络,支撑上层MQTT物联网协议传输数据与指令,并将基于能量比的声学几何定位算法作为监控的核心功能。首先使用MATLAB仿真实验证实了定位原理的合理性和算法的可行性;然后对四部异质Android设备进行麦克风特性测试并修正算法参数;最后搭建了测试平台。实验表明此平台达到了可用的定位精度。

To fulfill requirements for monitoring aged people, this paper proposed a platform design for monitoring based on smart phone microphone sensor network. The platform utilized smart devices equipped with microphones to collect audio signals, adopted Wi-Fi as the infrastructure network, supporting upper layer protocol MQTT to transmit data and directives, and introduced one acoustic geometrical location algorithm based on energy ratio as the core function of this monitoring system. Firstly, a MATLAB simulation experiment confirmed the rationality of the principle and feasibility of the algorithm. Secondly, it performed a microphone feature test on four heterogeneous Android devices thus lead to parameter amendment. Finally, it built a test platform and experiment on it achieved usable precision for monitoring.