无线传感器网络中DV-Hop定位算法的改进

无线传感器网络中基于无需测距的节点定位算法定位精度不高,一般应用在粗精度定位中。为了提高基于无需测距的DV-Hop算法定位精度,利用最小均方差准则改进算法,通过修改指数值精化平均每一跳距离,提出不同通信半径、不同锚节点覆盖率下的最佳指数值概念,并应用在一种锚节点均匀分布环境中,进一步提高定位精度。MTLAB仿真结果表明,在最佳指数值下,改进的算法在不同锚节点覆盖率、不同通信半径下能提高定位精度,同时不会增加节点能量消耗与硬件成本。

Improvement of DV-HOP Algorithm in Wireless Sensor Networks

The range-free node localization algorithm, for its not so high positioning accuracy in the wireless sensor network, and is usually applied in coarse-precision positioning. In order to improve the precision of range-free DV-Hop positioning algorithm, the least mean square error criterion method is used to modify the index for refining the value of average hop distance. Thus the concept of optimal index under different communication radius and different anchor nodes number is proposed, and by combining with a uniform distribution of anchor nodes, the positioning accuracy is further improved. Simulation with MTLAB indicates that, with the optimal value of index, the algorithm could improve the location accuracy in different anchor nodes coverage rates and in the different communication radius, without any increase of node energy consumption and hardware cost.