Abstract—

It is established that the interference invariant can be calculated not only by analyzing the frequency and spatial distribution of the intensity field but also by studying the phase-gradient field. It is found that the interference structure of the intensity field and the field of value inverse to the phase gradient (effective phase velocity) can be described by identical dependences, based on the use of invariant. It is shown that, in contrast to shallow water, which is characterized by relative stability of invariant values, the interference invariant in deep water changes significantly with variation in distance. In the shadow zone, with detectors and sources located at real depths (less than 400 m), the interference invariant can be described by an analytical dependence, which is in essence affected by only the water depth and distance; it is affected by neither sound frequency, nor source depth, nor detector depth and is only slightly affected by the characteristics of speed-of-sound vertical profile. Hence, the thus obtained analytical dependence can be referred to as invariant.

中文翻译：

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振幅和相位方法确定深水波导中的干扰不变量

摘要-

已经确定，不仅可以通过分析强度场的频率和空间分布，而且可以通过研究相位梯度场来计算干扰不变性。已经发现，基于不变性的使用，强度场和与相位梯度相反的值场（有效相速度）的干涉结构可以通过相同的依赖关系来描述。结果表明，与以不变值相对稳定为特征的浅水区相比，深水区的干扰不变量随距离的变化而显着变化。在阴影区中，探测器和震源位于真实深度（小于400 m），干扰不变性可以通过分析相关性来描述，而分析相关性实际上仅受水深和距离的影响。它不受声音频率，源深度或检测器深度的影响，并且仅受声速垂直剖面特征的轻微影响。因此，由此获得的分析依赖性可以被称为不变的。