基于信道质量分析传感器弱节点定位模型仿真

Node Localization Model Simulation of Weak Sensor Based on Analysis of Channel Quality

对传感器弱节点进行有效定位能够保证传感器网络的稳定运行。传统方法进行传感器弱节点定位时,没有考虑传感器信道由于节点分布不均产生的稀疏性,致使定位过程中出现大量无意义的零值抽头估计计算,从而降低了定位效率。提出一种基于信道质量分析的传感器弱节点定位方法,对传感器信道进行导频插入,在支持向量机的基础上引入递归机制,并对代价函数进行改进,实现对传感器信道子载波处的信道频率强度的准确预测,完成传感器信道质量的分析。然后,将分析结果转换为距离信息,并以接收数据的参考传感器节点为圆心、以距离为半径画圆,对每一个传感器节点的坐标赋予权值,最终得到传感器弱节点的定位结果。仿真结果表明,改进后的算法能够极大提高传感器弱节点的定位精度,效果令人满意。

The weak node positioning of sensor can effectively guarantee the stable operation of the sensor net- work. Traditional methods for weak node positioning of sensor do not consider the sensor channel due to node distri- bution of sparse, a lot of meaningless appeare in the process of the positioning zero tap estimated calculation, thus the efficiency of positioning is reduced. This paper proposes a method for weak node positioning of sensor based on the channel quality analysis, the method provides sensor channel for pilot insertion, the support vector machine （SVM） is introduced into reeursive mechanism, the cost function is improved, channel frequency strength of implementation sensor letters line carrier is accurately forecasted, and quality analysis of the sensor channel is completed. Then, the results of the analysis are transformed to the distance information, and a circle is obtained which takes the reference sensor node to receive data as the center of the circle and the distance as the radius, the coordinates of each sensor node weights are given, and eventually the weak node positioning results of sensor are acquired. The experimental re- sult shows that the improved algorithm can greatly enhance the positioning accuracy for weak nodes of sensor, and the effect is satisfied.