Patents by Inventor Kumar Gaurav Chhokra

Kumar Gaurav Chhokra 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).

  • Publication number: 20190094379
    Abstract: The disclosed embodiments use 3D city models and shadow mapping to improve altitude fixes in urban environments. In an embodiment, a method comprises: generating a set of three-dimensional (3D) candidate positions in a geographic area of interest; predicting global navigation satellite system (GNSS) signal visibility at selected ones of the 3D candidate positions; receiving GNSS signals at a current location of the mobile device; determining observed satellite visibility based on the received GNSS signals; comparing the predicted satellite visibility with the observed satellite visibility; determining a position fix based on a result of the comparing; determining an indoor environment where the mobile device is located based at least on an altitude component of the position fix; obtaining structural data for the identified indoor environment; and determining a floor lower bound for the current location of the mobile device based on the altitude component and the structural data.
    Type: Application
    Filed: September 28, 2017
    Publication date: March 28, 2019
    Applicant: Apple Inc.
    Inventors: Kumar Gaurav Chhokra, Glenn Donald MacGougan, Robert Mayor
  • Patent number: 10171946
    Abstract: Systems, methods, devices and computer-readable storage mediums are disclosed for assisted GNSS velocity estimation. In an implementation, a method comprises: obtaining, by a mobile device, a step-based speed measurement based on sensor data; obtaining, by the mobile device, a step-based speed uncertainty associated with the step-based speed measurement; determining, by the mobile device, that one or more assistance conditions are met; responsive to the determining, assisting a state estimator using the step-based speed measurement and the associated step-based speed uncertainty; and estimating at least one of the position, velocity or speed of the mobile device using the assisted state estimator.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: January 1, 2019
    Assignee: Apple Inc.
    Inventors: Glenn Donald MacGougan, Changlin Ma, Kumar Gaurav Chhokra, Robert Mayor
  • Patent number: 10078138
    Abstract: Techniques for GNSS positioning using three-dimensional (3D) building models are described. A processor can determine a probable path for a signal from a GNSS space vehicle (e.g., a satellite) to reach the GNSS receiver. The probable path can include one or more specular reflections. The processor can determine a Doppler correction based on the probable path, including inverting a sense of a vector of the Doppler correction for each reflection. The processor can then incorporate the Doppler correction in an estimated velocity of the mobile device, an estimated position of the mobile device, or both.
    Type: Grant
    Filed: September 8, 2015
    Date of Patent: September 18, 2018
    Assignee: Apple Inc.
    Inventors: Kumar Gaurav Chhokra, Glenn Donald MacGougan
  • Patent number: 9945956
    Abstract: Techniques for GNSS positioning using three-dimensional (3D) building models are described. A processor of a mobile device can determine a lower bound of uncertainty for an estimated position of the mobile device. The processor can receive an estimated position from a GNSS receiver of the mobile device. The processor can acquire geographic feature data including 3D building models of buildings and other geographic features that are located near the estimated position and may reflect GNSS signals. The processor can then determine a lower bound of uncertainty of the estimated position, regardless of an estimated uncertainty provided by a GNSS estimator. The lower bound can be higher (e.g., have a greater error margin) than the uncertainty value provided by the GNSS estimator. The processor can then present the estimated position, in association with an error margin corresponding to the lower bound of uncertainty, on a map user interface of the mobile device.
    Type: Grant
    Filed: September 8, 2015
    Date of Patent: April 17, 2018
    Assignee: Apple Inc.
    Inventors: Kumar Gaurav Chhokra, Glenn Donald MacGougan
  • Publication number: 20170359694
    Abstract: Techniques for location source control for paired devices are described. Location source control selects a location source for a mobile device. The mobile device can receive, from an application program, a request for determining a location of the mobile device. The mobile device can determine a first location estimate using a location subsystem of the mobile device. The mobile device can determine whether to provide the first location estimate as input to the application program, or to provide a second location estimate as input to the application program. The second location estimate can be an estimated location of the companion device and determined by the companion device.
    Type: Application
    Filed: September 23, 2016
    Publication date: December 14, 2017
    Applicant: Apple inc.
    Inventors: Bradley Joel Jensen, Glenn Donald MacGougan, Kumar Gaurav Chhokra, Robert Mayor, Ronald K. Huang, Stephen J. Rhee
  • Publication number: 20170357005
    Abstract: Techniques for improving positioning performance using categorization of navigation signal environment are described. A mobile device can receive signal environment data. The signal environment data can represent multiple geographic areas. The signal environment data includes a respective signal environment category for each geographic area, each signal environment category corresponding to a degree to which geographic features in the respective geographic area affect reception of the navigation signals. The mobile device can determine that the mobile device is located in a particular geographic area represented in the signal environment data. The mobile device can then select a set of one or more rules for aiding location estimation. The set of one or more rules can correspond to the signal environment category of the geographic area. The mobile device can estimate a location of the mobile device using the navigation signals and under the set of one more rules.
    Type: Application
    Filed: September 23, 2016
    Publication date: December 14, 2017
    Applicant: Apple Inc.
    Inventors: Jonathan M. Diamond, Glenn Donald MacGougan, Kumar Gaurav Chhokra, Robert Mayor, Yishuang Geng
  • Publication number: 20170347239
    Abstract: Systems, methods, devices and computer-readable storage mediums are disclosed for assisted GNSS velocity estimation. In an implementation, a method comprises: obtaining, by a mobile device, a step-based speed measurement based on sensor data; obtaining, by the mobile device, a step-based speed uncertainty associated with the step-based speed measurement; determining, by the mobile device, that one or more assistance conditions are met; responsive to the determining, assisting a state estimator using the step-based speed measurement and the associated step-based speed uncertainty; and estimating at least one of the position, velocity or speed of the mobile device using the assisted state estimator.
    Type: Application
    Filed: September 23, 2016
    Publication date: November 30, 2017
    Applicant: Apple Inc.
    Inventors: Glenn Donald MacGougan, Changlin Ma, Kumar Gaurav Chhokra, Robert Mayor
  • Patent number: 9816818
    Abstract: An apparatus and method for providing an improved heading estimate of a mobile device in a vehicle is presented. First, the mobile device determines if it is mounted in a cradle attached to the vehicle; if so, inertia sensor data may be valid. While in a mounted stated, the mobile device determines whether it has been rotated in the cradle; if so, inertia sensor data may no longer be reliable and a recalibration to determine a new relative orientation between the vehicle and the mobile device is needed. If the mobile device is mounted and not recently rotated, heading data from multiple sensors (e.g., GPS, gyroscope, accelerometer) may be computed and combined to form the improved heading estimate. This improved heading estimate may be used to form an improved velocity estimate. The improved heading estimate may also be used to compute a bias to correct a gyroscope.
    Type: Grant
    Filed: December 1, 2011
    Date of Patent: November 14, 2017
    Assignee: QUALCOMM Incorporated
    Inventors: Joseph Czompo, Guttorm Ringstad Opshaug, Kumar Gaurav Chhokra, Zoltan Fenene Biacs, Wyatt T. Riley
  • Patent number: 9817102
    Abstract: Methods, systems and computer program products for determining and filtering potential outliers in RF signals used in radionavigation are described. A radionavigation subsystem of a mobile device can determine a first location estimate of the mobile device. The mobile device can determine a free direction from the first location estimate. The free direction can be a direction along which RF signals may cause greater position errors than RF signals from other directions may cause. The mobile device can determine a potential outlier among the received RF signals, the potential outlier being an RF signal from a signal source in the free direction. The mobile device can indicate to the radionavigation subsystem that a weight of the potential outlier shall be reduced when determining a second location estimate of the mobile device using the RF signals.
    Type: Grant
    Filed: June 10, 2016
    Date of Patent: November 14, 2017
    Assignee: Apple Inc.
    Inventors: Isaac Thomas Miller, Glenn Donald MacGougan, Kumar Gaurav Chhokra
  • Patent number: 9763050
    Abstract: Apparatus and methods for estimating a location of a wireless device in communication with a wireless network, such as a UMTS network, based at least in part on WLAN/WPAN AP measurements and/or barometric measurements are disclosed. The wireless device responds to a location capability inquiry from the wireless network by providing a response that indicates the wireless device is configurable to estimate its location based on WLAN/WPAN AP and/or barometric measurements. The wireless network sends WLAN/WPAN AP and/or barometric reference information to the wireless device to assist in estimating its location. The wireless device measures one or more WLAN/WPAN APs, and the wireless device uses the WLAN/WPAN AP and/or barometric measurements to estimate its location. In some embodiments, GPS/GNSS information is used in conjunction with WLAN/WPAN AP and/or barometric measurements to estimate the location of the wireless device.
    Type: Grant
    Filed: February 3, 2016
    Date of Patent: September 12, 2017
    Assignee: Apple Inc.
    Inventors: Farouk Belghoul, Robert W. Mayor, Glenn D. MacGougan, Kumar Gaurav Chhokra, Syed A. Mujtaba, Dawei Zhang, Tarik Tabet
  • Patent number: 9763051
    Abstract: Apparatus and methods for estimating a location of a wireless device in communication with a wireless network, such as an LTE/LTE-A network, based at least in part on WLAN/WPAN AP measurements and/or barometric measurements are disclosed. The wireless device responds to a location capability inquiry from the wireless network by providing a response that indicates the wireless device is configurable to estimate its location based on WLAN/WPAN AP and/or barometric measurements. The wireless network sends WLAN/WPAN AP and/or barometric reference information to the wireless device to assist in estimating its location. The wireless device measures one or more WLAN/WPAN APs, and the wireless device uses the WLAN/WPAN AP and/or barometric measurements to estimate its location. In some embodiments, GPS/GNSS information is used in conjunction with WLAN/WPAN AP and/or barometric measurements to estimate the location of the wireless device.
    Type: Grant
    Filed: February 3, 2016
    Date of Patent: September 12, 2017
    Assignee: Apple Inc.
    Inventors: Farouk Belghoul, Robert W. Mayor, Glenn D. MacGougan, Kumar Gaurav Chhokra, Syed A. Mujtaba, Dawei Zhang, Tarik Tabet
  • Publication number: 20170068001
    Abstract: Techniques for GNSS positioning using three-dimensional (3D) building models are described. A processor can determine a probable path for a signal from a GNSS space vehicle (e.g., a satellite) to reach the GNSS receiver. The probable path can include one or more specular reflections. The processor can determine a Doppler correction based on the probable path, including inverting a sense of a vector of the Doppler correction for each reflection. The processor can then incorporate the Doppler correction in an estimated velocity of the mobile device, an estimated position of the mobile device, or both.
    Type: Application
    Filed: September 8, 2015
    Publication date: March 9, 2017
    Applicant: APPLE INC.
    Inventors: Kumar Gaurav Chhokra, Glenn Donald MacGougan
  • Publication number: 20170067999
    Abstract: Techniques for GNSS positioning using three-dimensional (3D) building models are described. A processor of a mobile device can determine a lower bound of uncertainty for an estimated position of the mobile device. The processor can receive an estimated position from a GNSS receiver of the mobile device. The processor can acquire geographic feature data including 3D building models of buildings and other geographic features that are located near the estimated position and may reflect GNSS signals. The processor can then determine a lower bound of uncertainty of the estimated position, regardless of an estimated uncertainty provided by a GNSS estimator. The lower bound can be higher (e.g., have a greater error margin) than the uncertainty value provided by the GNSS estimator. The processor can then present the estimated position, in association with an error margin corresponding to the lower bound of uncertainty, on a map user interface of the mobile device.
    Type: Application
    Filed: September 8, 2015
    Publication date: March 9, 2017
    Applicant: APPLE INC.
    Inventors: Kumar Gaurav Chhokra, Glenn Donald MacGougan
  • Publication number: 20160234645
    Abstract: Apparatus and methods for estimating a location of a wireless device in communication with a wireless network, such as an LTE/LTE-A network, based at least in part on WLAN/WPAN AP measurements and/or barometric measurements are disclosed. The wireless device responds to a location capability inquiry from the wireless network by providing a response that indicates the wireless device is configurable to estimate its location based on WLAN/WPAN AP and/or barometric measurements. The wireless network sends WLAN/WPAN AP and/or barometric reference information to the wireless device to assist in estimating its location. The wireless device measures one or more WLAN/WPAN APs, and the wireless device uses the WLAN/WPAN AP and/or barometric measurements to estimate its location. In some embodiments, GPS/GNSS information is used in conjunction with WLAN/WPAN AP and/or barometric measurements to estimate the location of the wireless device.
    Type: Application
    Filed: February 3, 2016
    Publication date: August 11, 2016
    Inventors: Farouk BELGHOUL, Robert W. MAYOR, Glenn D. MACGOUGAN, Kumar Gaurav CHHOKRA, Syed A. MUJTABA, Dawei ZHANG, Tarik TABET
  • Publication number: 20160234644
    Abstract: Apparatus and methods for estimating a location of a wireless device in communication with a wireless network, such as a UMTS network, based at least in part on WLAN/WPAN AP measurements and/or barometric measurements are disclosed. The wireless device responds to a location capability inquiry from the wireless network by providing a response that indicates the wireless device is configurable to estimate its location based on WLAN/WPAN AP and/or barometric measurements. The wireless network sends WLAN/WPAN AP and/or barometric reference information to the wireless device to assist in estimating its location. The wireless device measures one or more WLAN/WPAN APs, and the wireless device uses the WLAN/WPAN AP and/or barometric measurements to estimate its location. In some embodiments, GPS/GNSS information is used in conjunction with WLAN/WPAN AP and/or barometric measurements to estimate the location of the wireless device.
    Type: Application
    Filed: February 3, 2016
    Publication date: August 11, 2016
    Inventors: Farouk BELGHOUL, Robert W. MAYOR, Glenn D. MACGOUGAN, Kumar Gaurav CHHOKRA, Syed A. MUJTABA, Dawei ZHANG, Tarik TABET
  • Publication number: 20120173142
    Abstract: An apparatus and method for providing an improved heading estimate of a mobile device in a vehicle is presented. First, the mobile device determines if it is mounted in a cradle attached to the vehicle; if so, inertia sensor data may be valid. While in a mounted stated, the mobile device determines whether it has been rotated in the cradle; if so, inertia sensor data may no longer be reliable and a recalibration to determine a new relative orientation between the vehicle and the mobile device is needed. If the mobile device is mounted and not recently rotated, heading data from multiple sensors (e.g., GPS, gyroscope, accelerometer) may be computed and combined to form the improved heading estimate. This improved heading estimate may be used to form an improved velocity estimate. The improved heading estimate may also be used to compute a bias to correct a gyroscope.
    Type: Application
    Filed: December 1, 2011
    Publication date: July 5, 2012
    Applicant: QUALCOMM INCORPORATED
    Inventors: Joseph CZOMPO, Guttorm Ringstad OPSHAUG, Kumar Gaurav CHHOKRA, Zoltan Fenene BIACS, Wyatt T. RILEY
  • Publication number: 20090295993
    Abstract: An example filtering system for filtering audiovisual content includes a detector arranged to detect presence of a specified marker in an image portion of the audiovisual content and a control system, responsive to the detector, for filtering the audiovisual content.
    Type: Application
    Filed: January 7, 2009
    Publication date: December 3, 2009
    Applicant: TOSHIBA AMERICA CONSUMER PRODUCTS, LLC
    Inventor: Kumar Gaurav Chhokra