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基于交叉谱矩阵可以按本征值划分为信号和含有噪音部分的思想，提出了一种自直接测量数据估计海浪方向谱的方法。该方法称为扩展本征矢方法（EEV），可应用于单点测量系统、仪器阵列以及由二者构成的复合阵列。现有的某些估计方法（如最大似然方法及其扩展形式等）仅是此方法的某种特例。
Based on the fact that the cross-spectrum matrix can be divided into the signal and the noise-containing part based on the eigenvalue, a method of estimating the direction of the ocean wave from the direct measurement data is proposed. This method is called Extended Eigen Vector Method (EEV) and can be applied to single point measurement systems, instrumentation arrays, and composite arrays of both. Some of the existing estimation methods (such as the maximum likelihood method and its extensions, etc.) are only some special cases of this method.