基于节点RSSI单跳距修正和LS-LM的无线传感网定位

为了有效改善无线传感网中无需测距节点定位算法的定位性能,提出了一种基于节点RSSI单跳距修正和LS-LM的无线传感网定位算法。基于距离向量 跳段算法原理,首先计算出参考节点的平均每跳距离,分析了未知节点与参考节点之间距离计算中的定位误差。其次,根据接收信号强度指示（RSSI）的大小设置了用于修正单跳距离的校正值。最后,利用最小二乘Levenberg Marquardt (LM)算法来优化每个节点的估计位置。实验结果表明：与传统算法和某些现有的改进算法相比,提出算法的定位精度有所提高。

Localization of wireless sensor networks based on node RSSI single hop correction and LS-LM

In order to improve the positioning performance of the range free node localization algorithm in wireless sensor networks, a wireless sensor network localization algorithm based on node RSSI single hop correction and LS-LM is proposed. Based on the principle of distance vector hop (DV Hop) algorithm, the average distance of the reference node is calculated firstly, and the positioning error in the distance calculation between the unknown node and the reference node is analyzed. Secondly, a correction value for correcting the single hop distance is set according to the size of the received signal strength indicator (RSSI). Finally, the estimation position of each node is optimized by using the least squares levenberg marquardt (LM) algorithm. The experimental results show that as compared with the traditional algorithm and some existing improved algorithms the positioning accuracy of the proposed algorithm is improved.