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在无线传感器网络节点定位中,可以给锚节点装备天线阵列,通过MUSIC算法得到信号波达方向,然后利用锚节点和信号波达方向可以准确估计出未知节点的位置.但由于MUSIC算法只能估计少于阵元数的信号方向,本文提出采用二阶共轭增强的MUSIC算法,对阵列输出进行二阶共轭扩展,扩展出更多的虚拟矩阵,锚节点能估计出多于阵元数的信号方向,并能提高精度.仿真结果说明:利用二阶共轭扩展的MUSIC算法对无线传感器网络进行节点定位精度比MUSIC算法提高了40%~60%.
In the wireless sensor network node positioning, the anchor node can be equipped with an antenna array, and the signal direction of arrival can be obtained by the MUSIC algorithm, and then the location of the unknown node can be accurately estimated by using the anchor node and the signal direction of arrival. However, since the MUSIC algorithm can only estimate In this paper, we propose a MUSIC algorithm using second-order conjugate enhancement to extend the output of the array by the second-order conjugate expansion and expand more virtual matrices. The anchor nodes can estimate more than the number of elements Signal direction and improve the accuracy.The simulation results show that the MUSIC algorithm based on second-order conjugate expansion can improve the localization accuracy of the WSN compared with the MUSIC algorithm by 40% -60%.