Abstract A variant of the traditional modal scintillation index is proposed for the discrimination of the active submerged/bottom target in a shallow water waveguide. Referred to the scintillation index applied in the passive surface/submerged target discrimination, the mathematical definitions of the modulated scintillation index (MSIm) and the total scintillation index (TSI) are introduced for active targets, where the mode excitations due to the target depth modulation exhibit a submerged or bottom dependent signature that can be exploited to statistically separate submerged and bottom targets. Simulations are presented for both an ideal sound speed profile as well as a typical sound speed profile of a downward refraction in shallow water environment. The approach based on the proposed TSI can provide a robust alternative to matched field processing for the problem of binary active submerged/bottom target classification.

中文翻译：

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基于总闪烁指数的活性水下/水底目标判别

摘要 提出了一种传统模态闪烁指数的变体，用于识别浅水波导中的有源水下/水底目标。参考应用于被动水面/水下目标判别的闪烁指数，对主动目标引入调制闪烁指数（MSIm）和总闪烁指数（TSI）的数学定义，其中目标深度调制引起的模式激发表现出浸没或底部相关的特征，可用于在统计上分离浸没目标和底部目标。对理想声速剖面以及浅水环境中向下折射的典型声速剖面进行了模拟。