Cooperation Technology And Its Application In DV-HOP Localization Algorithm

Wireless sensor network is a pioneering research field which attracts much attention. It extends people's capability of getting information, it is widely used in military affairs, manufacturing industry, city management, medical treatment and public health, doing rescue and relief work, remote control of hazardous areas,environmental monitoring.The information of location is of great significance to wireless sensor network, without knowing the location of node, the sensored objective physical information is meaningless.On the one hand, this paper introduces the self-localization of node in wireless sensor network, especially the range-free localization technology, summarizes the performance assessment principles for localization technology, assesses the performance of the localization algorithm in light of these principles,including the localization precision, localization scope, complexity of algorithm.On the other hand, this paper introduces the principle and development status of cooperation technology, the definition and classification of cooperative localization, the difference between cooperative localization and the traditional one, the advantage of cooperative localization, the research status of the cooperative localization.In this paper, cooperative theory is introduced into DV-Hop localization algorithm, an improved DV-Hop algorithm is positioned. On the basis of the traditional algorithm, the improved one inducts iterative cooperation theory, improves the computation method in the traditional algorithm of the average distance per hop and lay down the principle for choosing the anchor node triangle.A large number of simulation results demonstrate that the improved DV-Hop algorithm improves the localization performance of the traditional algorithm a lot with a higher localization precision and a wider localization scope, the improved algorithm keeps a good performance even with a small amount of anchor nodes,low density of nodes and a small transmission radius.At last, this paper summarizes the application fields of wireless sensor network and discusses the foreground of the location technology of wireless sensor network.