无线传感器网络电子航标节点定位算法研究

A Study of Node Locating Algorithm for Networks of Electronic Aids to Navigation Based on Wireless Sensor Networks

介绍了无线传感器网络电子航标节点测距定位的定位原理和算法。针对该定位算法的非线性方程组求解问题,依据UKF算法,用一个最小的样本点集来近似系统状态的分布函数。实现了当系统按实际的非线性模型演化时,对非线性函数的后验均值与方差的很好拟合。仿真结果表明,用UKF算法的节点定位估计精度在5%以内。可见,它在解决非线性机动目标跟踪问题时有比较好的跟踪性能和滤波结果。

The locating algorithm of the WSN＇s ranging location based on the RSSI（Received Signal Strength Indication）is introduced.Aiming at the solution problem of nonlinear equations in the locating algorithm,with the UKF（Unscented Kalman Filter）algorithm,a minimal sample point-group is applied to approximate the distribution function of system states and obtain the mean value and variance of system states.When the system evolves in accordance with an actual nonlinear model,the fitting of the posterior mean value and variance of nonlinear function can be well carried out.Simulation results indicate that the precision of node location estimates is within 5% by using the UKF algorithm.Obviously,it has better tracking performance and filtering consequence in solving nonlinear maneuvering objective tracking problems.