| Wireless sensor network node location is an important technical support in the application field,is a new type of data acquisition technology.The wireless sensor network is a high degree of integration of computer,microelectronics,wireless communication and wireless network.It is widely used,such as forest fire location,agricultural ecological environment data collection,insect living habits statistics,industrial control,medical and military Rescue,etc.,access to node location is the basic application requirements.According to the research progress of domestic and foreign scholars,the node positioning technology is discussed.The location of the wireless sensor network localization algorithm can be divided into Range-free and Range-based localization algorithm two categories.Range-free localization algorithm has more advantages.Therefore,the Range-free localization algorithm is the focus of this paper:(1)Introduce several typical Range-free localization algorithms and the mathematical principles involved in the algorithm.The advantages and disadvantages are briefly analyzed.Finally propose the innovative application.(2)The DV-Hop algorithm can also be optimized.Based on the existing research,a new localization algorithm is proposed.The improved algorithm broadcasts the data using multi communication radius and refines the hops to reduce the location error.In calculating the average one-hop distance,remove the isolated nodes,introduce weights corrected results,to obtain a more precise one-hop distance.The simulation result indicates that the improved algorithm can greatly improve the location accuracy without obviously increasing algorithm complexity and communication traffic.(3)The 3D-DV-Hop algorithm uses the double communication radius to communicate with other node,introduces the weight correction,then selects the appropriate mathematical method to get the position.The simulation results show that the improved algorithm has a high positioning accuracy in 3D space. |
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