Abstract
A spiral wave front beacon consists of a transducer whose phase depends on the azimuth at which it is received and a reference transducer whose phase does not. [J. Acoust. Soc. Am. 129:(6), 2011]. A spiral wave front can be produced by using a cylindrical transducer whose radius advances by one wavelength over one revolution, or by phasing a circular array of elements out of phase such that they generate a spiral wave front. Several experiments using both of these types of beacons are carried out at the Navy's Dodge Pond facility in Connecticut. This facility provides a range of environments where the robustness of the signals in multipath and reverberation can be tested. Navigation experiments are carried out using a remotely operated USV equipped with a hydrophone and a data acquisition system which triggers upon receipt of an incoming signal. The vehicle is also equipped with a differential global positioning system (DGPS) receiver to determine its exact position. Several types of outgoing signals are ...
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