基于旋转不变阵列的分段平稳信号欠定DOA估计

Underdetermined DOA Estimation of Quasi-stationary Signals Based on Rotational Invariance Array

为克服KR-MUSIC算法限定阵列为均匀线列阵、需要空域谱搜索、计算量较大的缺点,提出了一种基于旋转不变阵列的DOA估计算法,扩大了应用范围,且算法通过解析运算估计DOA,避免了计算量较大的谱搜索.该算法可估计的DOA个数由KR-MUSIC方法的2N-1增加到N2/2.仿真结果表明,在同样信噪比、帧长和帧数条件下,本文算法的性能要优于KR-MUSIC算法.

In this paper, a new algorithm is proposed to overcome the shortcomings of KR-MUSIC such as strong restriction of array structure and high computation complexity resulting from spatially spectral search. The proposed method relaxes uniform linear array structure to milder rotational invariance one, and has lower computation complexity by only performing analytical operation. In addition, N2/2 DOA can be estimated by our proposed algorithm, as it is only 2N - 1 for KR-MUSIC. Simulation results show that proposed algorithm has better performance than KR-MUSIC for the same number of frames, length of frame and signal-to-noise ratio.