基于TOA的无线传感器网络源定位算法研究

Wireless Sensor Networks Source Localization Algorithm Based on TOA

针对无线传感器网路的信号源定位问题,结合信号到达时间(TOA),本文提出了一种基于TOA的无线传感器网路源定位算法。考虑到TOA源定位算法的观测方程中位置信息和源信号传输时间之间的非线性关系,在常用线性化方法的基础上,设计了一种新的线性化方法,即通过坐标系平移变换来去除观测方程中的非线性变量;同时,利用多级估计来获取更好的定位性能;最后,进行了仿真实验。实验结果表明:当测量误差足够小时,本文所述定位算法可以有效地逼近CRLB下限,而且计算复杂度较低、定位精度较高。

According to the signal sowrce localization problem of wireless sensor networks, combined with time of arrival （TOA） , a kind of wireless sensor networks source localization algorithm based on TOA is put forward in this paper. Considering the nonlinear relationship between location information and signal transmission time, a new linearization method is designed on the basis of the commonly used linearization method. Namely the nonlinear variable in the observation equation is removed through coordinate system transformation. At the same time, the better localization per- formance can be obtained by multi-level evaluation. Finally, the simulation experiments are carried out. The experimen- tal results show that if the measurement error is small enough, the localization algorithm described in this article can ef- fectively approach to the lower limit of CRLB, and has lower calculation complexity as well as high locating accuracy.