Patents by Inventor Toshinobu NAGAMATSU

Toshinobu NAGAMATSU has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • System and method for calibrating inter-frequency hardware bias in RTK positioning using error correction information
    Patent number: 11156724
    Abstract: In RTK positioning, a calibration memory stores calibration information for combinations of GNSS receivers. A memory processor retrieves the calibration information for a selected combination of a first GNSS receiver for a base station and a second GNSS receiver for a rover from the calibration memory. A calibration apparatus, by communicating with the rover and the memory processor, receives a first correction signal associated with the first GNSS receiver, obtains the calibration information and modifies the first correction signal therewith to generate a modified correction signal calibrated for the second GNSS receiver with respect to the first GNSS receiver, and transmits the modified correction signal to the rover. The rover performs the RTK positioning with respect to a known GNSS receiver of the base station using the modified correction signal, thereby automatically achieving the frequency-dependent hardware bias calibration for the second GNSS receiver with respect to the first GNSS receiver.
    Type: Grant
    Filed: November 7, 2019
    Date of Patent: October 26, 2021
    Assignee: Magellan Systems Japan, Inc.
    Inventors: Nobuhiro Kishimoto, Toshinobu Nagamatsu, Takehiro Ohnishi
  • SYSTEM AND METHOD FOR CALIBRATING INTER-FREQUENCY HARDWARE BIAS IN RTK POSITIONING USING ERROR CORRECTION INFORMATION
    Publication number: 20210141098
    Abstract: In RTK positioning, a calibration memory stores calibration information for combinations of GNSS receivers. A memory processor retrieves the calibration information for a selected combination of a first GNSS receiver for a base station and a second GNSS receiver for a rover from the calibration memory. A calibration apparatus, by communicating with the rover and the memory processor, receives a first correction signal associated with the first GNSS receiver, obtains the calibration information and modifies the first correction signal therewith to generate a modified correction signal calibrated for the second GNSS receiver with respect to the first GNSS receiver, and transmits the modified correction signal to the rover. The rover performs the RTK positioning with respect to a known GNSS receiver of the base station using the modified correction signal, thereby automatically achieving the frequency-dependent hardware bias calibration for the second GNSS receiver with respect to the first GNSS receiver.
    Type: Application
    Filed: November 7, 2019
    Publication date: May 13, 2021
    Inventors: Nobuhiro KISHIMOTO, Toshinobu NAGAMATSU, Takehiro OHNISHI