非典型声强向量阵对体积目标定向的基阵共用技术研究

Bearing Estimation of the Separate Sections of a Volume Target with Non-Typical Vector Acoustic Intensity Array

舰船在近距离上应视为体积目标,提出利用非典型声强向量阵对体积目标各部位定向的基阵共用技术。体积目标中部、中后部辐射的低频声源用声强度向量法定向,尾部的高频声源用自适应有限冲击响应(FIR)高精度时延估计法定向,共用同一小尺度基阵。为验证此方案,在半消声室进行了非典型声强向量阵的定向实验,用3个扬声器模拟体积目标3个不同部位的声源。实验结果表明:对这3个部位的定向可取得满意的精度,且这3个不同部位可分。本项研究为在小尺度平台上同时实现对舰船三辐射声亮点的定向开辟了途径。

Ships at short distance should be considered as a volume target. A scheme was proposed for the bearing estimation of the separate sections of a volume target with a non-typical vector acoustic intensity array. The bearings of the midway section and the section between the midway and the stern of the volume target radiating low frequency noise were estimated with the vector acoustic intensity method, while the bearing of the stern section radiating high frequency noise was estimated with the high precision adaptive FIR time delay estimation method, and both the above two methods used the same array of small size. To test this scheme, experiment was conducted in a semi-anechoic chamber, with 3 loudspeakers simulating the sound sources of the 3 separate sections of the volume target. Experimental results show that bearings of the 3 sections can be estimated with satisfying precision and the 3 sections are distinguishable. This scheme provides a feasible approach for the bearing estimation of the 3 sections of a ship with a small array.