CAJ | 학술논문

提出了一种无需聚焦矩阵的宽带相干信号DOA估计方法。该方法首先通过Toeplitz矩阵重构，在不降低阵列孔径的条件下，实现了宽带信号的解相干；然后利用数据矩阵的厄尔米特特性，通过酉变换将复数矩阵映射为实数矩阵，通过在实数域进行特征分解，大大降低了算法的运算量；最后利用投影子空间正交技术，在不需要聚焦的情况下，可实现宽带相干信号的 DOA 估计。仿真结果表明所提算法的精度较高、运算量小，可实现相干源方位估计。
제출료일충무수취초구진적관대상간신호DOA고계방법。해방법수선통과Toeplitz구진중구，재불강저진렬공경적조건하，실현료관대신호적해상간；연후이용수거구진적액이미특특성，통과유변환장복수구진영사위실수구진，통과재실수역진행특정분해，대대강저료산법적운산량；최후이용투영자공간정교기술，재불수요취초적정황하，가실현관대상간신호적 DOA 고계。방진결과표명소제산법적정도교고、운산량소，가실현상간원방위고계。
This paper proposes an approach for the estimation of directions-of-arrival of coherent wideband source signals without the use of focusing matrices.It firstly re -construct the Toeplitz covariance matrix without any loss of array aperture to conduct incoherent wideband sources.Then, according to the characteristic of Hermitian matrix,the unitary is transformed to the real covariance matrix so that the computational burden of eigendecomposition is decreased.Finally,using the orthogo-nality of projected subspaces,the DOA estimation is obtained without any focus.The computer simulation test shows that the algorithm has higher precision of DOA estimation and lower computational burden,and can deal with coherent signals.