Abstract
In shallow water, the intensity of an acoustic signal often exhibits sloped striation patterns in the range-frequency plane due to the constructive and destructive interference of normal modes. These range-frequency interference patterns vary with signal frequency, transmission range, environmental variability, etc. With different waveguide environments, although range-frequency interference patterns are quite different, they have two similarities: (1) When environmental parameters and signal frequency are fixed, the oscillating range period of signal intensity is independent of range, i.e. the stripes are evenly distributed along range. (2) A striation pattern is divided into several sections by critical frequencies and each section spans the same frequency interval. Based on these similarities, a range-frequency interference pattern can be transformed to adapt to different environmental parameters just by compressing or expanding it.
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