【摘要】 由于在冲激噪声背景下,MUSIC算法对信源波达方向估计将失去韧性,且无法解相干,运算量较大,为此对前后向平滑算法和修正的MUSIC算法进行了改进,提出相干信源波达方向估计新算法。简要分析了线阵模型以及共变,将阵列输出矩阵从二阶原点矩扩展到低阶矩,通过分析共变矩阵,得到基于共变矩阵的空间谱,再将谱峰搜索转变为多项式求根,最后可得相干信源波达方向估计。通过仿真,在冲激噪声或高斯噪声下,改进算法可以对相干信源的波达方向进行正确估计。算法性能分析表明改进算法具有良好的稳健性。更多还原

【Abstract】 Under the background of impulse noise,the MUSIC algorithm will loss the tenacity for the DOA(direction of arrival) estimation of the signal source,can’t perform the decorrelation,and has heavy computation,therefore the forward-backward smoothing algorithm and modified MUSIC algorithm are improved to propose a new algorithm for DOA estimation of the signal source. The linear array model and co-variation are analyzed briefly. The output matrix of the array is extended from the 2-order origin moment to low-order moment. The spatial spectrum based on co-variation matrix is obtained by analyzing the co-variation matrix,and then the spectral peak searching is transformed into the polynomial rooting to estimate the DOA of the coherent signal source. The simulation results show that the algorithm can correctly estimate the DOA of the coherent signal source under the background of impulse noise or Gaussian noise. The analysis result of the algorithm performance shows that the algorithm has good robustness.更多还原