Abstract
During a recent shallow-water experiment conducted in the northern East China Sea (SAVEX15), a low-frequency (0.5-2 kHz) source (SeaNos) was towed at the mid-depth (~50 m), being close to the channel axis of the underwater sound channel (USC) observed unexpectedly in a shallow water waveguide environment. It provided a variety of distances and propagation directions between the source and two moored vertical line arrays (VLAs). The channel impulse responses from the SeaNos indicate that the earlier reflected and refracted arrivals from the USC are followed by surface/bottom reflected arrivals. The later reflected arrivals are utilized for source-range estimation using the array/waveguide invariant based on the beam-time migration and the VLAs.
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