Patents by Inventor Javad Ashjaee

Javad Ashjaee 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).

  • Patent number: 8125376
    Abstract: A handheld GNSS device for determining position data for a point of interest is provided. The device includes a housing, handgrips integral to the housing for enabling a user to hold the device, and a display screen integral with the housing for displaying image data and orientation data to assist a user in positioning the device. The device further includes a GNSS antenna and at least one communication antenna, both integral with the housing. The GNSS antenna receives position data from a plurality of satellites. One or more communication antennas receive positioning assistance data related to the position data from a base station. The GNSS antenna has a first antenna pattern, and the at least one communication antenna has a second antenna pattern. The GNSS antenna and the communication antenna(s) are configured such that the first and second antenna patterns are substantially separated. Coupled to the GNSS antenna, within the housing, is at least one receiver.
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: February 28, 2012
    Assignee: Javad GNSS, Inc.
    Inventors: Javad Ashjaee, Lev B. Rapoport, Mikhail Gribkov, Alexander Gribkov
  • Patent number: 8120527
    Abstract: A rover processor determines position of a rover based upon the interaction between multiple antennas located at the rover and multiple antennas located at a base. The rover antennas may include a rover master antenna having a phase center located at the centroid of the antennas patterns of at least two auxiliary rover antennas. The rover processor may determine the position of the rover master antenna based upon the relative positions of at least two rover antennas (e.g., the rover master antenna and at least one rover auxiliary antenna, or at least two rover auxiliary antennas) with respect to at least two antennas of a base transceiver.
    Type: Grant
    Filed: January 27, 2009
    Date of Patent: February 21, 2012
    Assignee: Javad GNSS, Inc.
    Inventors: Javad Ashjaee, Lev B. Rapoport, Dmitry Kinkulkin, Vladimir Yefriemov
  • Patent number: 8094087
    Abstract: A portable navigation apparatus is provided. The apparatus includes a multi-antenna assembly configured for including an expanded configuration and a collapsed configuration. The antenna assembly includes a master antenna, and at least two auxiliary antennas. The at least two auxiliary antennas are radially distributed about the master antenna. Furthermore, the master antenna and auxiliary antennas are substantially coplanar when the antenna assembly is in the expanded configuration.
    Type: Grant
    Filed: September 19, 2008
    Date of Patent: January 10, 2012
    Assignee: Javad GNSS, Inc.
    Inventors: Javad Ashjaee, Alexander Andreevich Vyazov
  • Publication number: 20110231057
    Abstract: A computer-implemented method for generating at least one segment of an offset path for a vehicle based on at least one segment of a base path is provided. The at least one segment of the base path is represented by a stored set of data points. The computer-implemented method includes comparing the at least one segment of the base path to a curvature constraint to determine if the at least one segment of the base path violates the curvature constraint. The curvature constraint is based on a characteristic of the vehicle and a desired offset distance from the at least one segment of the base path. The characteristic reflects the vehicle's ability to traverse at least one segment of a path. The method further includes modifying the at least one segment of the base path to satisfy the curvature constraint, if the at least one segment of the base path violates the curvature constraint.
    Type: Application
    Filed: March 19, 2010
    Publication date: September 22, 2011
    Applicant: JAVAD GNSS, INC.
    Inventors: Javad Ashjaee, Alexander V. Pesterev, Lev B. Rapoport
  • Patent number: 8022868
    Abstract: Dynamic inter-channel bias calibration of a navigational receiver is provided. A reference signal is propagated through front end circuitry of the receiver. A delay caused by the propagation of the reference signal through the front end circuitry is measured. The inter-channel bias of the navigational receiver is reduced using the measured delay associated with the front end circuitry of the receiver.
    Type: Grant
    Filed: December 31, 2008
    Date of Patent: September 20, 2011
    Assignee: JAVAD GNSS, Inc.
    Inventors: Sergey Yudanov, Vyacheslav Varyukhin, Nikolay Shurygin, Stanislav Sila-Novitskiy, Javad Ashjaee
  • Publication number: 20110075886
    Abstract: A graphics-aided geodesic device is provided. The device may include a display, camera, distance meter, GNSS (Global Navigation Satellite System, including GPS, GLONASS, and Galileo) receiver and antenna, and horizon sensors. Data from the camera and horizon sensors may be displayed to assist the user in positioning the device over a point of interest. In one example, the distance meter may be used to determine the position of the point of interest. In another example, images of the point of interest taken from multiple locations may be used to determine the position of the point of interest.
    Type: Application
    Filed: September 30, 2009
    Publication date: March 31, 2011
    Applicant: JAVAD GNSS, INC.
    Inventors: Javad ASHJAEE, Mikhail Gribkov, Lev Rapoport
  • Publication number: 20100164798
    Abstract: Dynamic inter-channel bias calibration of a navigational receiver is provided. A reference signal is propagated through front end circuitry of the receiver. A delay caused by the propagation of the reference signal through the front end circuitry is measured. The inter-channel bias of the navigational receiver is reduced using the measured delay associated with the front end circuitry of the receiver.
    Type: Application
    Filed: December 31, 2008
    Publication date: July 1, 2010
    Inventors: Sergey YUDANOV, Vyacheslav VARYUKHIN, Nikolay SHURYGIN, Stanislav SILA-NOVITSKIY, Javad ASHJAEE
  • Publication number: 20090195475
    Abstract: A portable navigation apparatus is provided. The apparatus includes a multi-antenna assembly configured for including an expanded configuration and a collapsed configuration. The antenna assembly includes a master antenna, and at least two auxiliary antennas. The at least two auxiliary antennas are radially distributed about the master antenna. Furthermore, the master antenna and auxiliary antennas are substantially coplanar when the antenna assembly is in the expanded configuration.
    Type: Application
    Filed: September 19, 2008
    Publication date: August 6, 2009
    Applicant: JAVAD GNSS, INC.
    Inventors: Javad ASHJAEE, Alexander A. VYAZOV
  • Publication number: 20090189804
    Abstract: A rover processor determines position of a rover based upon the interaction between multiple antennas located at the rover and multiple antennas located at a base. The rover antennas may include a rover master antenna having a phase center located at the centroid of the antennas patterns of at least two auxiliary rover antennas. The rover processor may determine the position of the rover master antenna based upon the relative positions of at least two rover antennas (e.g., the rover master antenna and at least one rover auxiliary antenna, or at least two rover auxiliary antennas) with respect to at least two antennas of a base transceiver.
    Type: Application
    Filed: January 27, 2009
    Publication date: July 30, 2009
    Applicant: Javad GNSS, Inc.
    Inventors: Javad Ashjaee, Lev B. Rapoport, Dmitry Kinkulkin, Vladimir Yefriemov
  • Patent number: 6731701
    Abstract: Prediction methods for navigation message symbols of satellite systems, such as GPS (Global Positioning System) and GLONASS (Global Orbiting Navigation System), that use information repetition in navigation data messages are disclosed. The methods enable one to eliminate the impact of symbol modulation for a received signal on the threshold performance of any navigation receiver, thereby permitting its operation in severe environments when the carrier-to-noise ratio C/N0 of “weak” satellite signals falls to levels below C/N0=20 dB*Hz.
    Type: Grant
    Filed: August 27, 2001
    Date of Patent: May 4, 2004
    Assignee: Topcon GPS LLC
    Inventors: Michael V. Vorobiev, Javad Ashjaee
  • Publication number: 20040066335
    Abstract: Antenna systems and methods are disclosed for receiving the signals of navigation satellites, such as global positioning satellites. The systems may be useful in reducing the effects of multipath signals on global positioning satellite signals.
    Type: Application
    Filed: May 2, 2003
    Publication date: April 8, 2004
    Inventor: Javad Ashjaee
  • Patent number: 6674399
    Abstract: GPS and GLONASS Satellites broadcast code signals which are modulated onto respective carrier signals, and which are received by two receivers on Earth. The first receiver is situated at a point with known coordinates. The results of its measurements are transmitted to a user at a second receiver through a connection link, the user wanting to know the position of the second receiver. The measurements of two receivers are related to a common time moment by extrapolating measurement data that has arrived through the connection link with a delay. An extrapolating unit examines the measurements to find and discard measurements with abnormal errors, and generates extrapolated measurement data (e.g., predictions) for the common time based upon the most reliable data. This enables the measurements of code delays and carrier phase shifts in the satellite signals received by two receivers to be processed for the position of the second receiver.
    Type: Grant
    Filed: August 22, 2002
    Date of Patent: January 6, 2004
    Assignee: Topcon GPS LLC
    Inventors: Mark Isaakovich Zhodzishky, Victor Abramovich Veitsel, Michail Y. Vorobiev, Javad Ashjaee
  • Patent number: 6659409
    Abstract: A positioning pole comprising an elongated center pole, a first guide disposed on an outer surface of the center pole, a first support leg, and a first attachment coupler which pivotally attaches the first support leg to the first guide. The first guide has an elongated dimension oriented parallel to the elongated dimension of the pole. The first attachment coupler has an elongated dimension oriented parallel to the elongated dimension of the guide, a first face, and a second face. The first face of the first attachment coupler has a contoured surface interfitting with the pole's first guide and enables the first attachment coupler to slide along the elongated dimension of the first guide without separating from the guide in directions that are perpendicular to the guide's elongated dimension. A locking mechanism locks the attachment coupler to a corresponding guide once a desired position is found for the support leg.
    Type: Grant
    Filed: March 21, 2002
    Date of Patent: December 9, 2003
    Assignee: Topson GPS LLC
    Inventor: Javad Ashjaee
  • Patent number: 6633256
    Abstract: Methods and systems for measuring coordinates of a target, particularly under strong multipath conditions, are described. A satellite navigation system antenna and a tilt sensor are mounted on a range pole, with the sensor at the pole's bottom tip. Signals from the antenna and tilt sensor are provided to a receiver, which computes the antenna's coordinates from the antenna signals, and the pole tips position from the computed coordinates and the tilt data. The operator places the pole tip on the target and swings the pole by hand over an angle sector of 15 degrees while keeping the tip on the target. Height of the target can be computed with a single measurement set, and X-Y coordinates with just three measurement sets. The use of additional measurements reduces errors in the target's coordinates since multipath errors are uncorrelated during movement of the antenna. Vertical alignment of the pole is unnecessary.
    Type: Grant
    Filed: August 24, 2001
    Date of Patent: October 14, 2003
    Assignee: Topcon GPS LLC
    Inventors: Alexey Vladislavovich Zhdanov, Javad Ashjaee
  • Publication number: 20030178537
    Abstract: A positioning pole comprising an elongated center pole, a first guide disposed on an outer surface of the center pole, a first support leg, and a first attachment coupler which pivotally attaches the first support leg to the first guide. The first guide has an elongated dimension oriented parallel to the elongated dimension of the pole. The first attachment coupler has an elongated dimension oriented parallel to the elongated dimension of the guide, a first face, and a second face. The first face of the first attachment coupler has a contoured surface interfitting with the pole's first guide and enables the first attachment coupler to slide along the elongated dimension of the first guide without separating from the guide in directions that are perpendicular to the guide's elongated dimension. A locking mechanism locks the attachment coupler to a corresponding guide once a desired position is found for the support leg.
    Type: Application
    Filed: March 21, 2002
    Publication date: September 25, 2003
    Inventor: Javad Ashjaee
  • Publication number: 20030152134
    Abstract: Prediction methods for navigation message symbols of satellite systems, such as GPS (Global Positioning System) and GLONASS (Global Orbiting Navigation System), that use information repetition in navigation data messages are disclosed. The methods enable one to eliminate the impact of symbol modulation for a received signal on the threshold performance of any navigation receiver, thereby permitting its operation in severe environments when the carrier-to-noise ratio C/N0 of “weak” satellite signals falls to levels below C/N0=20 dB*Hz.
    Type: Application
    Filed: August 27, 2001
    Publication date: August 14, 2003
    Inventors: Michael V. Vorobiev, Javad Ashjaee
  • Patent number: 6594912
    Abstract: Disclosed are electronic plumb indicators for monopoles, survey poles, global positioning antennas and the like. A exemplary plumb indicator comprises a substrate, a plumb bob suspended by a thread (e.g., wire, cable, string, etc.) and disposed over a first surface of the substrate, and a probe. The substrate has an array of conductive pads disposed over its first surface, preferably in a regular pattern. The probe has a first body portion held by the plumb bob but allowed to move freely in the vertical direction, and a conductive tip disposed between the plumb bob and the first surface of the substrate. The probe tip makes contact with the first surface of the substrate, and contacts one or more pads in normal operation. The pads may be scanned electronically to determine the location of the probe tip and plumb bob with respect to the substrate.
    Type: Grant
    Filed: April 20, 2001
    Date of Patent: July 22, 2003
    Assignee: Topcon GPS LLP
    Inventor: Javad Ashjaee
  • Publication number: 20030085839
    Abstract: GPS and GLONASS Satellites broadcast code signals which are modulated onto respective carrier signals, and which are received by two receivers on Earth. The first receiver is situated at a point with known coordinates. The results of its measurements are transmitted to a user at a second receiver through a connection link, the user wanting to know the position of the second receiver. The measurements of two receivers are related to a common time moment by extrapolating measurement data that has arrived through the connection link with a delay. An extrapolating unit examines the measurements to find and discard measurements with abnormal errors, and generates extrapolated measurement data (e.g., predictions) for the common time based upon the most reliable data. This enables the measurements of code delays and carrier phase shifts in the satellite signals received by two receivers to be processed for the position of the second receiver.
    Type: Application
    Filed: August 22, 2002
    Publication date: May 8, 2003
    Inventors: Mark Isaakovich Zhodzishky, Victor Abramovich Veitsel, Michail Y. Vorobiev, Javad Ashjaee
  • Publication number: 20030058164
    Abstract: Methods and systems for measuring coordinates of a target, particularly under strong multipath conditions, are described. A satellite navigation system antenna and a tilt sensor are mounted on a range pole, with the sensor at the pole's bottom tip. Signals from the antenna and tilt sensor are provided to a receiver, which computes the antenna's coordinates from the antenna signals, and the pole tips position from the computed coordinates and the tilt data. The operator places the pole tip on the target and swings the pole by hand over an angle sector of 15 degrees while keeping the tip on the target. Height of the target can be computed with a single measurement set, and X-Y coordinates with just three measurement sets. The use of additional measurements reduces errors in the target's coordinates since multipath errors are uncorrelated during movement of the antenna. Vertical alignment of the pole is unnecessary.
    Type: Application
    Filed: August 24, 2001
    Publication date: March 27, 2003
    Inventors: Alexey Vladislavovich Zhdanov, Javad Ashjaee
  • Patent number: 6493378
    Abstract: The present application is applicable to receivers for Global Positions (GP) systems which use delay-lock loops (DLLs) and, optionally, phase-lock loops (PLLs). The application discloses multipath error reduction techniques which enable the multipath errors in DLL systems to be made much less than the error present in known narrow “early-late” correlators, or their corresponding implementations which use strobe representations of the PR-code. Also disclosed are multipath error reduction techniques that enable multipath errors in the PLL systems to be reduced. The techniques, when applied to both the DLL and PLL systems work synergistically to further reduce multipath errors.
    Type: Grant
    Filed: January 6, 1999
    Date of Patent: December 10, 2002
    Assignee: Topcon GPS LLC
    Inventors: Mark Isaakovich Zhodzishsky, Victor Abramovich Veitsel, Javad Ashjaee