猎雷声呐这类小目标声呐的高频阵,波束极窄,通常在0.1°～0.2°范围,远场距离很远,约在三四百米以上.在常规球面波声场条件下测量指向性难以实施,近距离测量又不符合远场条件.本文将阵分成若干子阵,子阵的波束宽,远场距离近,可以先在近距离测量各子阵的复数指向性,然后推算总阵的指向性.测量是在邻近区以内的准球面波声场进行的,实验结果很好地验证了所提出的原理和方法. Hunting thunder sonar such high-frequency array of small target sonar, the beam is very narrow, usually in the range of 0.1 ° ~ 0.2 °, the far-field distance is far, about more than three hundred or four hundred meters in the conventional spherical wave field measurement directivity It is difficult to implement and the distance measurement does not accord with the far field condition.In this paper, the array is divided into a number of subarrays, the beam width and the far field distance of the sub-array are close, the complex directivity of each sub-array can be measured at a short distance first, Of the directivity.The measurement is carried out in the vicinity of the quasi-spherical acoustic wave field, the experimental results a good validation of the proposed principles and methods.