本方法不需要特征分解，并且得到的是通常意义上的功率谱(可用于估计信号的能量)。
In this method, eigen-decomposition does not have to be used, and the direction spectrum is the power spectrum in common sense (it can be used to estimate signal power).
功率波是与信号源的可用功率紧密相关的。
These waves are related to the available power of the generator.
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