基于RSSI路径损耗因子动态修正的三边质心定位算法

针对无线传感器网络节点定位受环境干扰精度较差的问题，提出了一种将路径损耗因子n根据实测环境进行动态修正的三边质心定位算法。前期由实际环境测出不同距离时RSSI与路径损耗因子n的对应关系，修正时由测得RSSI值及对应关系根据环境中干扰因素的局部相似性进行局部加权修正出动态路径损耗因子nR，使其更能体现出与实测环境本身及干扰因素的密切相关性，然后利用三边质心法定位。仿真表明，算法降低了环境干扰引起的误差，显著提高了定位精度。

Dynamic Correction Algorithm for Trilateral Centroid Localization Based on RSSI Path Loss Factor

To solve the poor positioning accuracy problem caused by environmental interference,the paper proposes a trilateral centroid algorithm that according to the actual environment to dynamically adjust the path loss factor n. Firstly,the author measures the corresponding relationship between RSSI and n with different distances in the actu?al environment. Then considering the partial similarity of interference factors,the author revises a dynamic nR by us?ing the new measured RSSI and the corresponding relation,which fully reflects the closely relationship between the n and environment factors. Finally,the paper uses the trilateral centroid algorithm to locate the points. Simulation shows that the algorithm reduces the error caused by environmental interference,and significantly improves the po?sitioning accuracy.