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在阵列信号处理中,确定信号的波达方向(DOA)需要估计信号的二维(2-D)空间谱。C。Usha Padmini等人(1994)已证明,圆阵用于估计宽带信号的DOA时具有许多好的特性。尤其是在基于圆阵的宽带信号子空间一维DOA估计中,即使不用延迟抽头也不会出现频率-方向模糊。在估计宽带信号的2-D空间谱时,我们发现用不带延迟抽头的圆阵会出现频率-仰角模糊。本文提出了一种用插值圆阵估计宽带信号2-D空间谱的新方法。在估计中,采用大孔径的圆阵(r>λmin/2)能获得更好的分辨性能和估计稳健性。
In array signal processing, determining the direction of arrival (DOA) of a signal requires estimating a two-dimensional (2-D) spatial spectrum of the signal. C. Usha Padmini et al. (1994) have shown that circular arrays have many good properties when used to estimate the DOA of wideband signals. Especially in the one-dimensional DOA estimation of a circular array-based broadband subspace, frequency-direction ambiguity will not occur even without delayed taps. When estimating the 2-D spatial spectrum of a wideband signal, we found that a frequency-elevation blur occurs with circular arrays without delay taps. In this paper, we propose a new method to estimate the 2-D spatial spectrum of wideband signals using interpolation circular arrays. In the estimation, the use of a large aperture circular array (r> λ min / 2) can obtain better resolution performance and estimation robustness.