ZigBee技术中基于RSSI测距的定位算法研究

摘要

采用CC2430／cC2431为核心芯片设计ZigBee节点，并采用此类节点构成一个ZigBee定位网络。根据节点接收信号强度（RSSI）的模型，估计出盲节点与参考节点的距离，并采用最小二乘法对估计的距离进行修正。选择3个接收信号强度最强的参考节点，根据修正的距离采用三边测量法估计出盲节点的坐标。实验表明，修正后的定位精度高于修正前的定位精度。%In this paper, ZigBee node based on CC2430/CC2431 core chip is designed, and such nodes are used to constitute a ZigBee network for positioning. The distance between blind node and reference node can be estimated according to node received signal strength indication （RSSI）. Least squares method is used to correct the estimated distance. According to the corrected distance, three strongest received signal strength reference nodes are selected. Triilateration is used to estimate the coordinates of the blind node. Experiments show that the positioning accuracy after the amendment is higher than that before the amendment.