摘要
提出了一种应用于移动自主网中节点定位的波达方向(Direction of Arrival,DOA)估计新方法,以满足移动自主网对节点定位机制的高精度和低复杂度的要求。利用牛顿法将延迟相加法和求根多重信号分类算法(Root-MUSIC)进行联合估计,定位过程分为2个阶段:采用延迟相加法进行实时粗略DOA估计;采用Root-MUSIC进行精准定位。将该方法实现于软件无线电(SDR)系统,综合了延迟相加法低复杂度和Root-MUSIC高估计精度的优点。Matlab仿真实验结果证明了该方法以较低的复杂度获得近似于单独采用Root-MUSIC所达到的高精度,解决了现有方法难以同时达到高精度和低复杂度的问题。
The paper proposes a novel direction of arrival（DOA） estimation method for node localization in mobile ad-hoc networks to meet the requirement of achieving high accuracy with low complexity.The method combines two known DOA estimation techniques：Delay-and-Sum and Root-MUSIC,via Newton＇s method.The localization process includes two stages：coarse DOA estimation via Delay-and-Sum,and fine DOA estimation via Root-MUSIC.The former consumes little power and the latter achieves high accuracy.The implemented SDR system has the advantages of both.Matlab simulation results prove this conclusion and solve the difficulty of achieving high accuracy with low complexity.
出处
《无线电工程》
2013年第1期25-28,共4页
Radio Engineering
