利用线谱起伏实现目标测距

发布时间：2018-03-26 06:25

本文选题：线谱　切入点：声强　出处：《声学学报》2017年06期

【摘要】：常见水中目标辐射噪声的线谱会随目标运动而出现强弱起伏。不同号简正波之间的干涉是目标声强随距离起伏的主要原因,利用简正波水平波数差和波导不变量之间的关系,推导了不同线谱随距离变化起伏的理论关系式。基于此关系式,提出利用两条或多条线谱声强起伏进行声源测距的方法。针对两条线谱起伏测距方法存在的旁瓣问题,解释其形成原因,并提出用多条线谱声强起伏抑制旁瓣。数值仿真验证了方法的可行性,利用多条线谱声强起伏测距的方法可有效抑制旁瓣。海试数据分析表明,当连续谱部分非常微弱无法有效测距时,利用多条线谱声强起伏测距的方法仍能稳定的估计渔船目标距离,估计距离的平均相对误差为12%。
[Abstract]:The linear spectrum of radiated noise of underwater target will fluctuate with the moving of target. The interference between different normal waves is the main reason for the fluctuation of sound intensity with distance. The relationship between the horizontal wave number difference of normal wave and the invariant of waveguide is used to make use of the relation between the difference of horizontal wave number of normal wave and the invariant of waveguide. In this paper, the theoretical relationship of variation of different line spectrum with distance is derived. Based on this formula, a method of measuring sound source by using two or more line spectrum intensity fluctuations is proposed. The sidelobe problem of two line spectrum fluctuation ranging methods is discussed. This paper explains the cause of its formation, and puts forward that the sidelobe can be suppressed by the intensity fluctuation of multiple line spectra. The feasibility of the method is verified by numerical simulation, and the sidelobe can be effectively suppressed by using the ranging method of acoustic intensity fluctuation of multiple linear spectra. The analysis of sea trial data shows that the proposed method can effectively suppress the sidelobe. When the continuous spectrum part is very weak and can not be effectively ranging, the range of fishing vessel target can be estimated stably by the method of multiple line spectrum sound intensity fluctuation ranging, and the average relative error of the estimated distance is 12 parts.
【作者单位】：中国海洋大学信息科学与工程学院;青岛市海洋科技协同创新中心;
【基金】：国家自然科学基金项目(11374270,11374271) 青岛海洋科学与技术国家实验室开放基金项目(QNLM2016ORP0106)资助
【分类号】：TB56

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