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首页> 外文期刊>Journal of computational acoustics >NEAR-AXIAL INTERFERENCE EFFECTS IN LONG-RANGE OCEAN ACOUSTIC PULSE PROPAGATION
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NEAR-AXIAL INTERFERENCE EFFECTS IN LONG-RANGE OCEAN ACOUSTIC PULSE PROPAGATION

机译：大范围海洋声脉冲传播中的近轴干扰效应

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In many long-range ocean propagation experiments the source and receiver are placed close to the depth of the waveguide axis. In this case, rays emerging from the source at sufficiently small angles intersect the sound-channel axis many times and form in its vicinity a large number of caustics with caustic cusps located repeatedly along the axis. In neighborhoods of cusped caustics there exists a very complicated interference pattern. Neighbourhoods of interference grow with range and at long ranges they overlap. As a resultm a complex interference wave (axial wave), that propagates along the waveguide axis, appears. The goal of this paper is to obtain the representation for the axial wave in the time domain and calculate its magnitude for a realistic model of a three-dimensional range-independent medium. Numerical computations are done for the average profile from the Acoustic Engineering Test (AET) experiment. The pulse center frequency of 75 Hz with 30-Hz bandwidth is used that corresponds to broadband acoustic signals which were transmitted during November 1994 in the eastern North Pacific Ocean as a part of the AET. The propagation range is 3250 km. The sound source is located on the waveguide axis, and the receiver is placed close to the depth of the axis. Through numerical simulation the dependencies of the magnitude of the axial wave on depth of the receiver and propagation range are studied.
机译：在许多远程海洋传播实验中，源和接收器都放置在靠近波导轴深度的位置。在这种情况下，从声源发出的光线以足够小的角度与声通道轴相交许多次，并在其附近形成大量的苛性碱，且苛性尖端沿轴线反复放置。在尖峰苛性碱附近，存在非常复杂的干扰模式。干扰邻域随着距离的增长而增长，在远距离时它们会重叠。结果，出现了沿着波导轴传播的复杂干扰波（轴向波）。本文的目的是在时域中获得轴向波的表示，并为三维范围独立介质的现实模型计算其大小。对声学工程测试（AET）实验中的平均轮廓进行了数值计算。使用75 Hz的脉冲中心频率和30 Hz的带宽，它对应于1994年11月在北太平洋东部作为AET的一部分传输的宽带声信号。传播距离为3250公里。声源位于波导轴上，接收器放置在靠近轴深度的位置。通过数值模拟研究了轴向波的大小对接收器深度和传播范围的依赖性。

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