人体运动传感数据的无线采集方案设计

摘要

提出运用无线传感网络的方法实现人体运动传感数据的采集.该系统包含传感节点、簇首节点和汇聚节点.采用分层分簇的组网形式,传感节点通过无线的形式自适应地连接到某个簇首节点.每个簇首节点采用分时的形式组织各自的传感节点,并进行数据融合,转发到汇聚节点,汇聚节点通过USB接口把数据传到上位PC机.针对该方案的特点,对传感节点和簇首节点之间的无线传感器网络设计了一套协议,主要包含节点间的时间同步机制和节点申请入网竞争的时延退避机制.实验结果表明,该协议具有数据通信可靠性高、丢包率低的优点.%A new human motion capture was proposed based on wireless sensor network. The system consists: sensor node, branch node and sink node. They work together in the form of clustering and layers. The sensor nodes adaptively connect to a branch node by wireless network. Each branch node manages its sensor nodes by time-division, besides, it carries on data-fusion and transmits the data to sink node. Sink node transmits the data to PC by USB. Considering the special feature of the system, a protocol was proposed which organizes the wireless network between sensor node and branch node. It consists mainly of time synchronization algorithm among sensor nodes and backoff time algorithm which is used when sensor nodes meet competition. Experimental results demonstrate that the protocol is adequately reliable and the lost of data packet is less in data communication.