一种基于MUSIC算法的二次搜索解模糊方法

在基于阵列天线的DOA估计中,研究者采用了多种手段和方法用来提高测角精度,而往往测角精度越高,角度模糊越严重。针对测角精度和角度模糊是相互矛盾的问题,提出了一种基于MUSIC算法的二次搜索的解模糊方法。首先用MUSIC算法粗搜索出目标信号的低精度来向,然后根据阵列设置推导出第二次搜索的角度范围,最后在新的角度搜索范围内进行小步长的角度搜索,得到目标信号的高精度来向。计算机仿真结果表明,本方法可以更快速、准确地实现高精度无模糊测向。

Method for solving ambiguity by twice searching based on MUSIC algorithm

In DOA estimation based on array antenna,many methods have been used to improve accuracy of angle measuring by searchers.But the higher the accuracy of angle measuring is,the more serious the angle ambiguity is.To solve the contradiction between the accuracy of angle measuring and angle ambiguity,a method for solving ambiguity by twice searching based on the MUSIC algorithm is proposed.Firstly,search the low accuracy DOA of target signals by using MUSIC algorithm.Then the expression of angle range in the second searching is deduced.Finally,search again with small step in new angle range,and the high accuracy DOA of target signals is found.Computer simulation proves that this method can realize angle measuring with high accuracy and without ambiguity more speedily and exactly.