The main studied topic of spatial spectrum estimation is the direction of arrival (DOA) of spatial signals.

对信号波达方向(doa)的估计是空间谱估计研究的主题。

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The noise in constant beam-width beam space is spatial correlative and color (non white), which affects the performance of wide-band-beam-space high resolution DOA (Direction of Arrival) estimator.

恒定束宽波束域噪声是空间相关的非白噪声，这给宽带波束域高分辨方位估计方法的性能带来影响。

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In processing of array signal, Direction of Arrival (DOA) of target can be obtained by extracting spatial frequency of echo.

在阵列信号处理中，提取回波信号中的空间频率，可以得到目标的方位信息。

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