US Patent 7499828 Position determining apparatus and related method

A system for determining the relative displacement of a rigid object is described herein. In one embodiment, the system includes three data sources positioned on an object. The data sources are configured to transmit data relating to positional displacement of the object. Each data source has predefined movement parameters based on the position of each data source on the object. In one embodiment, the system further includes a receiver unit configured to display positional information relating to the object based on the data received from each data source. The positional information represents a single valid solution set generated in part by eliminating positional movements that exceed the predefined movement parameters.