首先，研究了匹配子空间检测理论和自适应子空间检测理论。

At first, Matched Subspace Detector (MSD) and Adaptive Subspace Detector (ASD) are derived theoretically.

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当噪声水平未知时，匹配子空间检测器属于“角度型”检测器。

With unknown noise level, the MSD is of "angle type".

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当噪声水平未知时，匹配子空间检测器属于“角度型”检测器。

With unknown noise level, the MSD is of "angle type".

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