Patents Assigned to Differential Corrections Inc.
  • Patent number: 5477228
    Abstract: Differential correction signals for a global positioning system (GPS), which operates with signals from a plurality of orbiting satellites, are provided in a first standard format, such as a RTCM SC-104 format, for each satellite in view of a reference receiver station. The differential correction signals include range error correction signals and range rate error correction information. The differential correction signals are then encoded according to a second standard format, such as the RDS format. The transmission time of the signals in the second standard format are then prioritized. A broadcast transmitter, such as a broadcast FM transmitter, is then modulated by the prioritized signals in the second standard format and a receiver receives and demodulates the broadcast signal. The broadcast prioritized signals in the second standard format are then decoded to provide differential correction signals in the first standard format.
    Type: Grant
    Filed: April 13, 1993
    Date of Patent: December 19, 1995
    Assignee: Differential Corrections Inc.
    Inventors: Anil Tiwari, Lynn Weber, Ronald P. Haley