Abstract: DV-Hop is a typical range-free positioning algorithm.Aimed at the problem of low positioning accuracy of the algorithm in the localization process,an improved algorithm based on mobile anchor node was proposed.The mobile anchor node was used to form multiple virtual anchor nodes,so as to reduce the number of anchor node effectively.Meanwhile,on the basis of the original algorithm,the average hop distance was modified,which makes it closer to the real value.The simulation results show that,the improved algorithm is better than the traditional DV-Hop algorithm and the average positioning error is reduced by about 30%,and the location accuracy is greatly improved.

Key words: Wireless sensor networks,Localization,DV-Hop algorithm,Mobile anchor nodes