A WSN Algorithm Based On Different-Hopsizes Revised DV-HOP

In wireless sensor networks, localization is a hot research direction, which has important guiding significance for promoting scientific development. It is more and more important to study the nature of the physical quantity, and some of the harsh environment, such as volcano, desert and other areas, need to know its relative location information. At present, the localization technology has a substantial breakthrough, domestic and foreign scholars put forward a lot of better positioning algorithm, due to the complexity of the actual environment, these algorithms are not easily applied to the real environment, there are some limitations. Therefore, designing a algorithm which has longer life cycle, lower power consumption, achieving higher accuracy of the node localization, is still a hard study of the subject of the wireless sensor network in the future.Node localization is mainly divided into two types, range-based and range-free. In this paper, DV-HOP,which we are going to do research, is a kind of range-free algorithm. In this paper, we will introduce the theory of sensor networks. The steps of DV-HOP positioning will be introduced in this paper, and the existing problems of original DV-HOP will be summarized. The shortcuts of original DV-HOP are mainly in two stages,which are the positioning stage and position estimation stage. According to the defects of the original DV-HOP algorithm, this paper proposes a new algorithm named BDRDV, which is based on different hop distance of each anchor nodes, and defines a new type of weighted coefficient. According to the shortcuts of the position estimation, the accumulated error is reduced to some extent.Finally, this paper uses the software MATLAB7.0 to carry out the experiment simulation. And three algorithms are picked up to be compared. These algorithms are our proposed algorithm BDRDV, the original DV-HOP, and the existing improved algorithm based on DV-HOP, which uses the average hop distance of the whole network as its correction value.The simulation shows our proposed algorithm BDRDV is feasible, and the positioning accuracy is improved.