UN-DSM优化模型下的节点定位方法研究

Research on Node Location Methods Under Optimized UN- DSM Model

通过改进以未知节点为中心的散射体圆盘模型,提出一种应用范围更广的以未知节点为中心的散射体圆盘模型优化方法。利用各锚节点测量的到达时间信息和只有主锚节点测得的到达角度信息,对未知节点及其周围的散射体进行初步估计,得出散射体坐标以及相关的距离值,利用未知节点至各锚节点和散射体的距离冗余约束信息进行修正估计,获得1倍数量的虚拟散射体信息,最终利用所有散射信息和测量信息联合定位求得未知节点位置。仿真实验结果表明,与传统经典定位方法相比,该方法能有效地抑制非视距传播误差并进一步提高定位精度,同时具有较好的鲁棒性。

An optimized localization model in Wireless Sensor Networks （ WSN ） is proposed based on the Unknown Node-oriented Disk of Scatterers Model（ UN-DSM） . It uses the Time of Arrival（ TOA） measured by every anchor node and Angle of Arrival （ AOA ） measured only by the main anchor node to estimate the positions of scatterers and the unknown node. The draft results and related ranges are obtained. The range redundant information is used for modification estimation and gets double suppositional scatterers information. Combine all scatterers information and range information to solve the position of the unknown node. Experimental results show that the proposed location method can restrain Non-Line-of-Sight（ NLOS） error effectively,and has better location effect than the traditional position methods with good robustness.