Patent 7224640 was granted and assigned to Wilcoxon Research, Inc. on May, 2007 by the United States Patent and Trademark Office.
In an underwater acoustic bearing sensor, the vector sensor, heading sensor, and pitch and roll sensor are held in a common mounting ring to ensure that their coordinate systems are collinear. The vector sensor includes x, y, and z accelerometers mounted in the ring and a hydrophone that can be mounted independently.