Localization Algorithm Research For Wireless Sensor Network

As the development of communication technology,embedded technology and electrical micro technology, Wireless sensor networks application has become a new network. Widely used in national defense,environmental monitoring,industrial control and other fields which has important applications and scientific value. When the nodes detects sudden event occurs, monitoring center needs to know the exact location to take an action which the important of localization will be appeared. Localization technology can not only provide location information, but also improve routing efficiency and achieve network load balancing functions.This paper gives an overview of the basics of wireless sensor networks and illustrates the basic architecture of location technology. Emphasizing on introducing the DV-HOP algorithm in detail, based on the error of using hop distance instead of straight line distance and the error caused by calculation, the paper gives two improved algorithm: improved algorithm based on modified distance and improved algorithm based on total least squares method which changes the calculation of the coordinate, not only considering the error of distance between the nodes, but also the anchor position error which resulting from its own locating at the same time. To give an overall analysis of combining the two improved algorithms. Finally, the article describes several mobile node localization algorithms, discussed the trilateral-centroid-localization for mobile anchor node in detail. The simulation results shows: appropriately increased the reference point of unknown node number can improve the positioning accuracy.This paper uses MATLAB as emulator, from node ratio, network connectivity, the average coverage to simulate the improved algorithm. Theoretical analysis and simulation results show: the improved algorithms can achieve better localization performance.