1
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 ...


2
David C Kelley, Joseph Cisneros, Louis A Greenbaum: Navigation and positioning system and method using uncoordinated beacon signals. Terrapin Corporation, Flehr Hohbach Test Albritton & Herbert, March 12, 1996: US05499032 (34 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 ...