Abstract
Spiral-wavefront transducers have received recent attention as enabling elements in phase-based underwater navigation systems, whereby the signaling transducer launches a diverging wave that is omnidirectional by magnitude but linearly phase-biased with azimuthal angle. The detected signal is compared with a control signal having constant phase to allow the unique determination of bearing angle. Range can be determined by time-of-flight. While such systems are used in air traffic control navigation, the transition to underwater acoustics had only emerged with the advent of increased unmanned underwater vehicle traffic (Dzikowicz and Hefner). Analytical and experimental test results, including beam patterns, TVR, and power factor, are presented for resonance operations at 25 kHz (c-band). [Work supported by BTech Acoustics LLC.]
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