一种低复杂度高精度测向新方法

A novel low-complexity and high-precision direction-finding method

针对传统MUSIC方法测角误差、计算复杂度分别与网格搜索间隔成正、反比关系这一矛盾,提出一种低复杂度高精度测向新方法。通过应用波束形成方法确定信号的粗略方向,缩小谱峰搜索范围,降低谱峰搜索计算量。同时结合信号子空间与噪声子空间的正交性弥补谱峰搜索步长设定带来的固有偏差,从而在不需降低谱峰搜索步长的情况下提高测向精度,实现低复杂度高精度测向的目的。仿真实验结果证明了该方法的有效性及优越性。

Considering the contradiction that the angular error and computational complexity of the conventional MUSIC method are directly and inversely proportional to the grid search interval respectively,this paper proposes a novel low-complexity and high-precision direction-finding method.This method narrows the spectral peak search range and reduces the computational amount of the spectral peak search by applying the beamforming method to determine approximate signal direction.At the same time,the orthogonality of the signal and noise subspaces is combined to make up for the inherent bias brought about by the setting of the spectral peak search step,thus improving the direction-finding accuracy without reducing the spectral peak search step,and realizing low-complexity and high-precision direction finding.The simulation experiment results prove the effectiveness and superiority of the method.