正交阵是指满足AA^T=E或者A^T A=E的n阶方阵A，其中E为n阶单位阵。
($又由于正交阵(orthogonal matrix)变形(平移和旋转矩阵皆为正交阵)， 为刚体变形(rigid-body transformation)，变形对象的长度、角度不会发生改变。
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提出了最大共轭化常数矩阵的概念，并证明了最大共轭化常数矩阵为二阶正交阵。
The concept of maximal constant matrix of conjugation is also given, and it is proved that the maximal constant matrix of conjugation is an orthogonal matrix of order two.
本文提出了反射阵的概念，揭示了非正交函数谱分析的镜像对称性。
Thus, the concept of reflection matrix is proposed and the mirror symmetry of spectral analysis for non orthogonal function is revealed.
在系数阵空间同样存在正交矢量谱估计方法。
Therefore, the orthogonal vector techniques can be applied to the LPEF coefficient matrix space for spectral estimation.
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