The extraction test to the different class signals tell us that the correlation dimension and generalised dimensions may effectively involve the class information of differentships, otherwise the h2 entropy is difficult to classify the targets.

• 通过对不同类别信号的特征提取表明，关联维数和广义维数能有效地代表不同类别的舰船特征，而h_2熵特征并不明显。