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).
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Publication number: 20120256788Abstract: The position of a global navigation satellite system (GNSS) surveying receiver is determined based on a plurality of RTK engines. A first RTK engine is implementing using a first set of parameters. A second RTK engine is implemented using a second set of parameter different than the first set. A plurality of GNSS signals are received from multiple satellites. At least one correction signal is received from at least one base receiver. A first position is determined from the first RTK engine based on the GNSS signals and the at least one correction signal. A second position is determined from the first RTK engine based on the GNSS signals and the at least one correction signal. A final position of the GNSS surveying receiver is determined based on the first position or the second position or a combination of both positions.Type: ApplicationFiled: April 2, 2012Publication date: October 11, 2012Applicant: JAVAD GNSS, INC.Inventors: Javad ASHJAEE, Lev B. RAPOPORT
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Publication number: 20120242542Abstract: 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: ApplicationFiled: September 20, 2011Publication date: September 27, 2012Applicant: JAVAD GNSS, Inc.Inventors: Sergey YUDANOV, Vyacheslav VARYUKHIN, Nikolay SHURYGIN, Javad ASHJAEE
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Publication number: 20120229333Abstract: An apparatus for determining signal strength data within at least one allocated GNSS frequency band is provided. The apparatus includes a GNSS antenna. The GNSS antenna receives signals within the allocated GNSS frequency band. The apparatus further includes receiving circuitry. The receiving circuitry is for demodulating the received signals. The apparatus further includes a processor and memory for storing instructions, executable by the processor. The instructions include instructions for generating signal strength data for the received signals within the GNSS allocated frequency based on the demodulated signals, and for determining a position for a point of interest based upon the demodulated signals. Included in the apparatus is a display screen for displaying a graphical representation of the signal strength data of at least a portion of the at least one GNSS allocated frequency band.Type: ApplicationFiled: September 8, 2011Publication date: September 13, 2012Applicant: JAVAD GNSS, INC.Inventors: Javad Ashjaee, Sergey Yudanov
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Publication number: 20120188122Abstract: A handheld GNSS 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. The device has a GNSS antenna and a communication antenna, both integral with the housing. The GNSS antenna receives position data from GNSS satellites. The communication antenna receives positioning assistance data from a base station. The GNSS antenna has a first antenna pattern, and the communication antenna has a second antenna pattern. The first and second antenna patterns are substantially separated. Coupled to the GNSS antenna, within the housing, is at least one receiver. Further, the device includes, within the housing, orientation circuitry for generating orientation data, imaging circuitry for obtaining image data, and positioning circuitry for determining a position for the point of interest based on the position data, the positioning assistance data, the orientation data, and the image data.Type: ApplicationFiled: January 18, 2012Publication date: July 26, 2012Applicant: JAVAD GNSS, Inc.Inventors: Javad Ashjaee, Lev B. Rapoport, Mikhail Gribkov, Alexander Gribkov
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Publication number: 20120139784Abstract: 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: ApplicationFiled: February 8, 2012Publication date: June 7, 2012Applicant: JAVAD GNSS, Inc.Inventors: Javad Ashjaee, Lev B. Rapoport, Dmitry Kinkulkin, Vladimir Yefriemov
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Publication number: 20120050099Abstract: 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: ApplicationFiled: August 30, 2010Publication date: March 1, 2012Applicant: JAVAD GNSS, INC.Inventors: Javad ASHJAEE, Lev B. Rapoport, Mikhail Gribkov, Alexander Gribkov
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Patent number: 8125376Abstract: 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: GrantFiled: August 30, 2010Date of Patent: February 28, 2012Assignee: Javad GNSS, Inc.Inventors: Javad Ashjaee, Lev B. Rapoport, Mikhail Gribkov, Alexander Gribkov
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Patent number: 8120527Abstract: 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: GrantFiled: January 27, 2009Date of Patent: February 21, 2012Assignee: Javad GNSS, Inc.Inventors: Javad Ashjaee, Lev B. Rapoport, Dmitry Kinkulkin, Vladimir Yefriemov
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Patent number: 8094087Abstract: 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: GrantFiled: September 19, 2008Date of Patent: January 10, 2012Assignee: Javad GNSS, Inc.Inventors: Javad Ashjaee, Alexander Andreevich Vyazov
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Publication number: 20110231057Abstract: 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: ApplicationFiled: March 19, 2010Publication date: September 22, 2011Applicant: JAVAD GNSS, INC.Inventors: Javad Ashjaee, Alexander V. Pesterev, Lev B. Rapoport
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Patent number: 8022868Abstract: 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: GrantFiled: December 31, 2008Date of Patent: September 20, 2011Assignee: JAVAD GNSS, Inc.Inventors: Sergey Yudanov, Vyacheslav Varyukhin, Nikolay Shurygin, Stanislav Sila-Novitskiy, Javad Ashjaee
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Publication number: 20110075886Abstract: 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: ApplicationFiled: September 30, 2009Publication date: March 31, 2011Applicant: JAVAD GNSS, INC.Inventors: Javad ASHJAEE, Mikhail Gribkov, Lev Rapoport
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Publication number: 20100164798Abstract: 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: ApplicationFiled: December 31, 2008Publication date: July 1, 2010Inventors: Sergey YUDANOV, Vyacheslav VARYUKHIN, Nikolay SHURYGIN, Stanislav SILA-NOVITSKIY, Javad ASHJAEE
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Publication number: 20090195475Abstract: 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: ApplicationFiled: September 19, 2008Publication date: August 6, 2009Applicant: JAVAD GNSS, INC.Inventors: Javad ASHJAEE, Alexander A. VYAZOV
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Publication number: 20090189804Abstract: 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: ApplicationFiled: January 27, 2009Publication date: July 30, 2009Applicant: Javad GNSS, Inc.Inventors: Javad Ashjaee, Lev B. Rapoport, Dmitry Kinkulkin, Vladimir Yefriemov
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Patent number: 6731701Abstract: 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: GrantFiled: August 27, 2001Date of Patent: May 4, 2004Assignee: Topcon GPS LLCInventors: Michael V. Vorobiev, Javad Ashjaee
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Publication number: 20040066335Abstract: 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: ApplicationFiled: May 2, 2003Publication date: April 8, 2004Inventor: Javad Ashjaee
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Patent number: 6674399Abstract: 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: GrantFiled: August 22, 2002Date of Patent: January 6, 2004Assignee: Topcon GPS LLCInventors: Mark Isaakovich Zhodzishky, Victor Abramovich Veitsel, Michail Y. Vorobiev, Javad Ashjaee
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Patent number: 6659409Abstract: 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: GrantFiled: March 21, 2002Date of Patent: December 9, 2003Assignee: Topson GPS LLCInventor: Javad Ashjaee
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Patent number: 6633256Abstract: 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: GrantFiled: August 24, 2001Date of Patent: October 14, 2003Assignee: Topcon GPS LLCInventors: Alexey Vladislavovich Zhdanov, Javad Ashjaee