| 衣晓锋,彭大勇,侯倩男,郭圣明.浅海低频垂直相控阵多模声场聚焦研究*[J].,2019,38(4):615-622 |
| 浅海低频垂直相控阵多模声场聚焦研究* |
| Multi-mode field focusing using a low-frequency vertical phased array in shallow water |
| 投稿时间：2019-01-29 修订日期：2019-07-01 |
| 中文摘要: |
| 为了提高低频垂直相控阵声场聚焦的环境适应性，增强环境失配情况下的声场聚焦效果，提出一种多模声场聚焦方法。该方法利用环境失配对低阶模态影响相对较小的特点，只利用前3阶模态进行发射权系数的计算。仿真结果表明，多模声场具有较大的聚焦跨度，在环境失配情况下仍能在期望的聚焦位置实现良好的聚焦效果。进一步地，根据巴斯微扰理论计算分析了多模声场的混响特性。由于多模声场聚焦将能量集中到了掠射角较小的低阶模态中，因此比最优权系数聚焦具有更低的混响平均强度。多模聚焦对聚焦深度进行扫描可以实现目标的深度分辨，这在水下目标探测方面具有较高的应用前景。 |
| 英文摘要: |
| In order to improve the environmental adaptability of sound field focusing in shallow water and enhance the focus effect in the mismatched environment, a multi-mode field focusing method is proposed using a low-frequency vertical phased array. The method only uses the first three normal modes to calculate the weight coefficient vector because the environment mismatch takes less influence on the lower order modes. Simulations show that multi-mode field focusing has a larger focusing span, and it can realize a better focusing effect at the expected focus position in the mismatched environment. Furthermore, the reverberation of vertical phase array is calculated based on the Bass perturbation theory. Because multi-mode field focusing concentrates the acoustic energy into the low-order modes with small grazing angle, it has lower average reverberation intensity than the focusing with the optimal weight coefficient vector. Using the multi-mode focusing method can realize the target depth discrimination by scanning the focus depth, which indicates that the multi-mode field focusing method has a broad application prospect in target detection. |
| DOI：10.11684/j.issn.1000-310X.2019.04.019 |
| 中文关键词: 相控阵，声场聚焦，多模，混响抑制 |
| 英文关键词: Phased array, Sound field focusing, Multi-mode, Reverberation suppression |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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