MUSIC测向算法的虚假谱峰消除方法研究

Study on Method of Eliminating Spurious Spectral Peak of MUSIC Direction Finding Algorithm

在基于均匀线阵的MUSIC测向算法中,单元间距与波长之比大于0.5时,可能会出现虚假谱峰,干扰真实波达方向的判断。现有的一些消除虚假谱峰的方法多适用于主动测向或非均匀阵列,而对被动测向和均匀阵列无法适用。针对这一问题,本文通过分析虚假谱峰的出现原因,提出一种新的通过机械旋转进行虚假谱峰消除的方法——阵列旋转法,并仿真分析验证了该方法的有效性。该方法实现简单,适用范围广,能较好满足实际工程设计需求。

In the MUSIC direction finding algorithm based on uniform linear array, when the ratio of the element spacing to wavelength is more than 0. 5, the spurious spectral peak may occur to interfere direction of real arrival estimation. The available methods of eliminating spurious spectral peak are mainly suitable for active direction find- ing or non-uniform array, not for passive direction finding and uniform array. Aiming at this issue, a novel method of eliminating spurious spectral peak （ array rotating method） by mechanical rotating after analyzing causes for occurrence of spurious spectral peak is presented. The simulated results show effectiveness of this method. The implementation of this method is simply, and it can be widely applied and meet real engineering design requirement.