Waveguide Invariant Applications in Underwater Acoustics
Summary
The waveguide invariant provides a unifying parameter that characterises the frequency–range scaling of modal interference in shallow- and deep-water sound channels. By quantifying the dispersion of acoustic modes, this invariant enables robust estimation of source range, depth and motion without detailed knowledge of the environmental profile. Practical applications encompass passive localisation of vessels and marine mammals, target velocity and trajectory estimation, discrimination of surface versus submerged sources, and remote sensing of seabed properties. Owing to its insensitivity to many environmental uncertainties, the waveguide invariant has become a cornerstone of striation-based beamforming, array invariant processing and tomographic approaches in both research and operational contexts.
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Waveguide Invariant Applications in Underwater Acoustics publication trend
The graph below shows the total number of articles in waveguide invariant applications in underwater acoustics across all publications each year (not limited to Nature Index journals).
Technical terms
Waveguide invariant (β): A dispersion parameter relating frequency and range scaling of interference striations in an idealised acoustic waveguide.
Generalised waveguide variant (GWV, η): An extension of β that quantifies striation orientation in the frequency–depth domain for depth discrimination.
Modal interference: The interaction of discrete acoustic modes producing frequency–range striations in received signals.
Array invariant (AI): A beamforming technique exploiting dispersion characteristics and coherent eigenray arrivals for source-range estimation.
Striation-based beamforming: A processing method that extracts and tracks interference striation slopes in element–frequency spectrograms for passive ranging.
References
- Estimation of Target Motion Parameters from the Tonal Signals with a Single Hydrophone. Sensors (2023).
- Source Depth Discrimination Using Intensity Striations in the Frequency–Depth Plane in Shallow Water with a Thermocline. Remote Sensing (2024).
- An overview of array invariant for source-range estimation in shallow water. The Journal of the Acoustical Society of America (2022).
- Striation-Based Beamforming with Two-Dimensional Filtering for Suppressing Tonal Interference. Journal of Marine Science and Engineering (2023).
- Application of Waveguide Invariant Theory to Analysis of Interference Phenomenon in Deep Ocean. Acoustics (2020).
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