1
Joseph S Cisneros, David C Kelley, Michael Kiang, Louis A Greenbaum: Navigation and positioning system and method using uncoordinated beacon signals in conjunction with an absolute positioning system. Pinterra Corporation, Gary S Flehr Hohbach Test Albritton & Herbert Williams, June 30, 1998: US05774829 (237 worldwide citation)

A navigation system in which an uncoordinated beacon positioning system (UBS) is used in conjunction with an absolute positioning system (APS) is described herein. The UBS employs a multiplicity of transmitters, at known locations, each of which transmits a beacon signal having a phase that is at le ...


2
David C Kelley, Joseph Cisneros, Louis A Greenbaum: Navigation and positioning system and method using uncoordinated becon signals. Pinterra Corporation, Gary S Flehr Hohbach Test Albritton & Herbert Williams, November 18, 1997: US05689270 (110 worldwide citation)

A positioning system uses a multiplicity of commercial broadcast stereo FM radio signal transmitters, at known fixed locations, each of which transmits a beacon signal having a phase that is un-synchronized with the phases of the beacon signals of the other transmitters. All the beacon signals have ...