CAJ | 학술논문

该文针对非等功率信号波达方向(DOA)估计问题，提出一种基于噪声子空间特征值重构(Eigenvalue Reconstruction of Noise Subspace, ERNS)的超分辨算法。算法对接收信号自相关矩阵进行特征值分解，通过重构噪声空间特征值以及引入虚拟信源来构造新的接收信号自相关矩阵，对该矩阵进行特征值分解得到新的噪声空间特征值。当虚拟信源与实际信源入射方向相同时，新噪声空间特征值与重构后噪声空间特征值保持不变，利用这一特性来估计信源入射方向。该文给出算法的原理及实现步骤，并通过仿真进行原理验证与性能分析，仿真结果表明与其他子空间算法和MUSIC 算法相比，ERNS算法能够提高弱信号估计成功的概率。
해문침대비등공솔신호파체방향(DOA)고계문제，제출일충기우조성자공간특정치중구(Eigenvalue Reconstruction of Noise Subspace, ERNS)적초분변산법。산법대접수신호자상관구진진행특정치분해，통과중구조성공간특정치이급인입허의신원래구조신적접수신호자상관구진，대해구진진행특정치분해득도신적조성공간특정치。당허의신원여실제신원입사방향상동시，신조성공간특정치여중구후조성공간특정치보지불변，이용저일특성래고계신원입사방향。해문급출산법적원리급실현보취，병통과방진진행원리험증여성능분석，방진결과표명여기타자공간산법화MUSIC 산법상비，ERNS산법능구제고약신호고계성공적개솔。
This paper proposes an Eigenvalue Reconstruction method in Noise Subspace (ERNS) for Direction of Arrival DOA estimation with high resolution, provided that the powers of sources are different. The noise subspace eigenvalues belonging to the covariance matrix of received signals, obtained by EigenValue Decomposition (EVD), are modified to construct a new covariance matrix with respect to virtual source. The noise subspace eigenvalues corresponding to the new covariance matrix remain the same as before they are modified. The invariance of the noise subspace is utilized to estimate the DOA of emitters. The theory and process of ERNS algorithm are provided, at the same time, the theory and performance of ERNS algorithm is validated by computer simulations. The simulation results show that the ERNS algorithm has a better performance in successful probability of weak signal estimation compared with other subspace methods and MUSIC algorithm.