Localization For Wireless Mobile Sensor Nodes

Wireless sensor networks, a novel technology about acquiring and processing information , integrate multifold subjects including microelectronic, wireless communication and wireless network, and is widely used in military, industrial controlling, environmental monitoring and etc. In most applications, determining the physical positions of sensor nodes is the basic requirements. The problem of self-localization, that is, determining where a given node is physically or relatively located in the networks, is a challenging one, and yet extremely crucial for many applicationsIn this paper, an effective location method is present to obtain accurate position estimation for mobile nodes and mitigate the influence of the NLOS propagation when sensor nodes that can acquire the velocity information. Firstly, the relative localization track (RLT), which reflects the shape of true track, is obtained using the velocity information. Then the cumulative error of RLT is corrected while the global optimum solution is obtained by minimizing the difference between RLT and radio localization track. Then a threshold is set to distinguish obvious deviation from radio localization. Finally, a more accurate localization result presents itself from the corrected RLT.Simulation results show the performances of our methods in term of accuracy and determinate the parameter the more adapted related to the network configurations.