作者在该文中从世界空间的四维坐标和四维波矢量出发，证明了电磁波的相位不变性。
This article, on the basis of four dimensional coordinates and four dimensional wave vectors of world space, proves the phrase constancy of electromagnetic waves.
该方法根据空间约束和导向矢量误差约束获得相应的窄带滤波器，并利用其对Capon滤波矢量进行滤波得到谱估计。
The estimator utilizes constraints on both the subspace and the errors of steering vectors to design a narrow filter. The filter outputs the spectral estimate with the filtering vector as its input.
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