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目前存在的宽带信号波达方向(DOA)估计方法仅限于估计已知信源数的信号方位角.Padmini等人最近指出,圆阵在估计宽带源的DOA时具有很多优良特性.采用具有延迟抽头的圆阵实现了宽带信号2-D空间谱估计,并将Choi等人针对未知信源数的窄带信号提出的扩展MUSIC方法,扩展用于宽带源的DOA估计.分析及仿真表明,该方法尤其适合宽带阵列信号处理,且采用大孔径(r>γ_(min)/2)圆阵可显著提高估计的分辨性能和稳健性.
The present method of estimating the DOA of wideband signals is limited to estimating the azimuth of the signal with known signal sources. Padmini et al. Recently pointed out that the circular array has many excellent characteristics in estimating the DOA of a broadband source. , The extended MUSIC method proposed by Choi et al. For a narrowband signal with unknown number of sources is extended to perform DOA estimation for wideband sources. The analysis and simulation show that this method is especially applicable to It is suitable for wideband array signal processing, and the large aperture (r> γ min / 2) circular array can significantly improve the performance of estimation resolution and robustness.