It is proposed to use the energy concentration factor and directivityfactor as indication of the directivity of the array, and formulae as well as the way of using them are presented.
对切比雪夫阵的指向性提出了用能量集中因数和指向性因数表达的概念，并给出了二者的计算方法和使用范围。
2
The integrand includes a multiplying factor of the vertical directivity of the noise intensity, and the layered ocean environment affects the spatial coherences via this directivityfactor.