Patents by Inventor Xiaorong Zhi

Xiaorong Zhi 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).

  • Vehicle navigation system with adaptive gyroscope bias compensation
    Patent number: 9683849
    Abstract: Adaptive gyroscope bias compensation allows a vehicle navigation module to estimate position and velocity reliably during temperature changes.
    Type: Grant
    Filed: April 1, 2015
    Date of Patent: June 20, 2017
    Assignee: Trimble Inc.
    Inventors: Xiaorong Zhi, Takayuki Hoshizaki, Peter Van Wyck Loomis, Walter Kenneth Stockwell
  • Vehicle navigation system with adaptive gyroscope bias compensation
    Publication number: 20160290810
    Abstract: Adaptive gyroscope bias compensation allows a vehicle navigation module to estimate position and velocity reliably during temperature changes.
    Type: Application
    Filed: April 1, 2015
    Publication date: October 6, 2016
    Applicant: TRIMBLE NAVIGATION LIMITED
    Inventors: Xiaorong Zhi, Takayuki Hoshizaki, Peter Van Wyck Loomis, Walter Kenneth Stockwell
  • Navigation sensor mounting-angle calibration
    Patent number: 8433514
    Abstract: Dead reckoning navigation sensors based on 3-axis gyroscopes and methods for calibrating sensor module orientation are described for three scenarios: (1) known mounting angles, (2) unknown, arbitrary mounting angles, and (3) unknown, but restricted mounting angles.
    Type: Grant
    Filed: May 17, 2012
    Date of Patent: April 30, 2013
    Assignee: Trimble Navigation, Limited
    Inventors: Xiaorong Zhi, Peter Van Wyck Loomis
  • GNSS time fraction calibration of a real time clock
    Patent number: 7791534
    Abstract: A generic navigation satellite system (GNSS) signal receiver having a fast time to first fix by calibrating a low power always-on real time clock (RTC). The receiver includes an RTC calibrator having a fraction calculator. The RTC calibrator may also include a time expander. Before the receiver is powered off, the fraction calculator uses the fine resolution of GNSS time for determining a time fraction for RTC time. When the receiver is powered back on, the time expander uses an estimate of RTC time drift during the time that GNSS receiver had power off and the time fraction for calibrating and increasing the resolution of the RTC time for an RTC time tick. A signal navigation processor uses the calibrated RTC time for assisting a first fix with code phase search, integration time periods, resolution of epoch integer and/or location-in-space of GPS satellites.
    Type: Grant
    Filed: March 13, 2009
    Date of Patent: September 7, 2010
    Assignee: Trimble Navigation Limited
    Inventors: Xiaorong Zhi, Yiming Yu, Joseph W. Fontes
  • Fast time to first fix by calibration of a real time clock
    Patent number: 7532159
    Abstract: A generic navigation satellite system (GNSS) signal receiver having a fast time to first fix by calibrating a low power always-on real time clock (RTC). The receiver includes an RTC calibrator having a fraction calculator. The RTC calibrator may also include a time expander. Before the receiver is powered off, the fraction calculator uses the fine resolution of GNSS time for determining a time fraction for RTC time. When the receiver is powered back on, the time expander uses an estimate of RTC time drift during the time that GNSS receiver had power off and the time fraction for calibrating and increasing the resolution of the RTC time for an RTC time tick. A signal navigation processor uses the calibrated RTC time for assisting a first fix with code phase search, integration time periods, resolution of epoch integer and/or location-in-space of GPS satellites.
    Type: Grant
    Filed: May 19, 2006
    Date of Patent: May 12, 2009
    Assignee: Trimble Navigation Limited
    Inventors: Xiaorong Zhi, Yiming Yu, Joseph W. Fontes
  • Fast time to first fix by calibration of a real time clock
    Publication number: 20070268180
    Abstract: A generic navigation satellite system (GNSS) signal receiver having a fast time to first fix by calibrating a low power always-on real time clock (RTC). The receiver includes an RTC calibrator having a fraction calculator and a time expander. Before the receiver is powered off, the fraction calculator uses the fine resolution of GNSS time for determining a time fraction for RTC time. When the receiver is powered back on, the time expander uses an estimate of RTC time drift during the time that GNSS receiver had power off and the time fraction for calibrating and increasing the resolution of the RTC time for an RTC time tick. A signal navigation processor uses the calibrated RTC time for assisting a first fix with code phase search, integration time periods, resolution of epoch integer and/or location-in-space of GPS satellites.
    Type: Application
    Filed: May 19, 2006
    Publication date: November 22, 2007
    Inventors: Xiaorong Zhi, Yiming Yu, Joseph W. Fontes