The mean and covariance matrixes and their inverse matrixes of all eigen vectors are obtained through measured data of the target. And the target is recognized by techniques of range discrimination.

由目标的实测数据，计算特征向量总体的均值和协方差矩阵及其逆矩阵，由距离判别法进行目标识别。

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According to Ageing in the Twenty-first Century: A Celebration and a Challenge, governments will need to adopt a wide range of policies and laws aimed at supporting the elderly and protecting them against discrimination.

FORBES: Why We Need Innovation To Prepare For The Global Aging Society