摘要
人员跟踪是室内定位系统的一项重要任务。在无线传感器网络中利用信号强度实现人员跟踪,无需专门的测距设备,能够降低系统的复杂度和成本,成为研究的热点。但是,由于人体对信号传播产生比较大的影响,给人员跟踪带来困难。提出一种新的信道模型,描述有人环境下信号强度与距离的关系。跟踪算法根据该模型建立信号强度的测量模型,并结合人的运动特点建立状态转移模型,最后利用粒子滤波技术实现了对人员的跟踪。该方法以序贯方式估计人员的位置,计算过程简单,而且对信号强度的噪声不敏感。仿真和实验表明,该方法的跟踪效果良好。
Human tracking problem is crucial for indoor localization systems. Received signal strength （RSS）based human tracking in wireless sensor networks requires no specific ranging devices and has attracted much research interest. But effects of human body on signal propagation bring difficulties to this method. In this paper, an empirical wireless channel model in human environment is proposed. When tracking human,this paper derives a measurement model from empirical signal model and a transition model of human movement,which are used by a particle filter. The algorithm estimates positions of human sequentially and it is insensitive to signal noise. Simulation and experiment results suggest that our method can improve the accuracy of human tracking.
出处
《传感技术学报》
CAS
CSCD
北大核心
2012年第6期807-814,共8页
Chinese Journal of Sensors and Actuators
基金
国家自然科学基金项目(60910005)
国家高技术研究发展计划项目(2008AA040207)
