【作者】 李晓曼； 朴胜春； 周建波；

【Author】 LI Xiao-Man;PIAO Sheng-Chun;ZHOU Jian-Bo;College of Underwater Acoustic,Engineering Harbin Engineering University;

【机构】 哈尔滨工程大学水声工程学院； 哈尔滨工程大学水声重点技术实验室；

【摘要】 通过将warping变换与群延迟理论相结合,提出了一种基于单水听器的浅海波导宽带声源被动测距的方法。宽带声信号在浅海波导中以不同阶简正波叠加的形式传播,各阶简正波到达水听器的时刻也各不相同,利用warping变换可以对各阶简正波进行有效分离。对分离后的信号进行时频分析处理后可以得到任意两阶简正波在各个频点下的时延,将其结果与群延迟理论相结合,可推导出声源传播距离的计算公式。在已知海水声速剖面以及海深两个主要环境参数的情况下,即可对声源进行准确的被动测距。该方法计算量小,测量简单方便。仿真处理结果验证了本方法的可行性。更多还原

【Abstract】 By combining warping transformation with group-delay theory, a method of passive broadband sound source range estimation on a single hydrophone in shallow water waveguides is presented. The transmission of broadband sound signals in the shallow water waveguides is in the form of the superposition of different normal modes, the arrival times to hydrophone of different normal modes are also different; the normal mode signals can be separated effectively by warping transformation. The time delay at every frequency of arbitrary two normal modes can be calculated after a time-frequency analysis processing, and then, combining the results with group-delay theory, the sound source propagation distance formula can be derived. While the sound speed profile and depth of waveguides these two marine environmental parameters are known, the source range can be estimated exactly. What’s more, this method need a small amount of calculation, the measurement is simple and convenient. The feasibility of this method is verified by the results of simulations and experimental data.更多还原