Analysis of beamforming performance of cylindrical array multi-beam fishery sonar#br#
(1 Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China;
2 Fishery Machinery and Instrument Research Institute, Chinese Academy of Fishery Science, Shanghai 200092, China)
Abstract：Cylindrical array multi-beam fishery sonar, as important acoustic equipment for accurate fishing in marine fisheries, can realize omni-directional scanning of the detection waters. Its beamforming ability is one of the main technical indicators reflecting the detection performance of fishery sonar. In this research starting from the analysis of beamforming ability of cylindrical array multi-beam fishery sonar, the vertical and horizontal beamforming was simulated and the effects of amplitude shift, phase shift and frequency shift on the vertical and horizontal beamforming performance of the cylindrical array were analyzed by using the simulation method of underwater acoustic algorithm. The results show that the amplitude and phase shift has little influence on the main lobe in the vertical and horizontal directions of the cylindrical array, and the main lobe becomes wider; the influence on the side lobe is great, and the side lobe is significantly enlarged; when the offset is -5~15 dB, the gain of the first lobe is within 3dB, and when the offset is too large, the gain of the first lobe can be more than 6dB; the frequency shift has a little influence on beam directivity, the working frequency has a great influence on the width of the beam main lobe, and the width deviation of the main lobe is about 3°. This research can provide a reference for the independent development of high-precision and long-distance cylindrical array multi-beam fishery sonar in the future.