Multipath-related Issues (ipc) Patents (Class 342/357.61)
  • Patent number: 10673485
    Abstract: A method and a receiving node for determining Time Of Arrival (TOA) for a radio signal received from a transmitting node in a wireless network. The receiving node detects the received radio signal by cross-correlating the received radio signal with a predefined reference signal transmitted by the transmitting node, to obtain a Cross-Correlated Function (CCF). The receiving node then estimates a set of candidate TOAs for respective signal components of the cross-correlated signal, and determines a final TOA for the received radio signal based on the set of candidate TOAs.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: June 2, 2020
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Henrik Rydén, Fredrik Gunnarsson, Sara Modarres Razavi, Ali Zaidi
  • Patent number: 10649094
    Abstract: A method for detecting a multipath effect in a GNSS receiver which is designed to receive different signals from a GNSS satellite and includes a parameter which is determined from directly received signals and has a substantially constant target value, including the steps receiving at least two mutually independent signals; determining a current parameter value from at least the first and the second signal; evaluating the parameter value in relation to the target value, and detecting a multipath effect when the parameter value has a deviation (?K) which deviates from the already known target value.
    Type: Grant
    Filed: February 24, 2016
    Date of Patent: May 12, 2020
    Assignee: Continental Teves AG & Co. oHG
    Inventor: Michael Zalewski
  • Patent number: 10539677
    Abstract: A method includes: obtaining an azimuth and a signal parameter value of each preset satellite of M preset satellites when a mobile terminal is at a first location. The M preset satellites are sorted according to the values of their azimuths and N satellite combinations are obtained from those satellites that are consecutively arranged and have signal parameter values less than preset values. In response to determining that a ratio of the quantity of the preset satellites in the first satellite combination to M is less than a first threshold, the positioning mode of the mobile terminal is set to an outdoor positioning mode. In response to determining that a ratio of the quantity of the preset satellites in the first satellite combination to M is greater than a second threshold, the positioning mode is set to an indoor positioning mode.
    Type: Grant
    Filed: June 4, 2015
    Date of Patent: January 21, 2020
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Chenxi Lu, Shuiping Long
  • Patent number: 10495762
    Abstract: Techniques provided herein are directed toward using a camera, such as a forward-facing camera, to identify non-line-of-sight (NLoS) satellites in a satellite positioning system. In particular, successive images captured by the camera of the vehicle can be used to create a three-dimensional (3-D) skyline model of one or more objects that may be obstructing the view of a satellite (from the perspective of the vehicle). Accordingly, this allows for the determination of NLoS satellites and exclusion of data from the NLoS satellites in the determination of the location of the vehicle. Techniques may further include providing the determined location of the vehicle.
    Type: Grant
    Filed: May 19, 2017
    Date of Patent: December 3, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Urs Niesen, Arvind Ramanandan
  • Patent number: 10264400
    Abstract: A tracking system can provide intervention notifications to a user to notify the user that a tracking device is potentially lost or is in a predicted state. The tracking system may notify the user that a tracking device is potentially lost or in a predicted state based on a number of factors, including: a proximity of a tracking device to other tracking devices or a user's mobile device, a movement of a tracking device to more than a threshold distance away from a mobile device or other tracking devices, a location of a tracking device relative to a geographic location or to geographic boundaries, a usage or movement behavior of the tracking device, a usage or movement behavior of a user or owner of a tracking device, information received from an external source, or information received from sensors within the tracking device or a user's mobile.
    Type: Grant
    Filed: April 6, 2018
    Date of Patent: April 16, 2019
    Assignee: Tile, Inc.
    Inventors: Guilherme de Barros Chapiewski, Melody Quintana, Mayank Kumar, Tyler Lettau, Wayne Patterson
  • Patent number: 10228469
    Abstract: The present technology relates to a reception device that can realize low power consumption. The reception device comprises an RF unit, a demodulating unit, and a control unit. The RF unit includes a filtering unit, an amplifying unit, and an A/D converter. The filtering unit allows an IF signal to pass within a predetermined band. The IF signal is acquired by mixing a reception signal received from a positioning satellite with a local oscillation signal generated by a local oscillation unit to perform frequency conversion of the reception signal into an intermediate frequency. The amplifying unit amplifies the IF signal with a predetermined amplification factor. The A/D converter converts the IF signal from an analog signal into a digital signal. The demodulating unit demodulates the digital signal. Based on the demodulation, the control unit controls an operation of the RF unit. The present technology is applicable to a GNSS receiver.
    Type: Grant
    Filed: February 13, 2015
    Date of Patent: March 12, 2019
    Assignee: SONY SEMICONDUCTOR SOLUTIONS CORPORATION
    Inventors: Hitoshi Tomiyama, Suguru Houchi, Katsuyuki Tanaka, Hideki Yokoshima, Yuya Kondo
  • Patent number: 10222479
    Abstract: GNSS receivers and methods of determining a current receiver state of a GNSS receiver are provided. The method includes receiving positioning signals from a plurality of satellites; generating a plurality of correlation grids from the received positioning signals, where each correlation grid is associated with a respective one of the plurality of satellites; estimating a probability distribution of the current receiver state from the plurality of correlation grids; and determining a maximum likelihood estimate of the current receiver state from the estimated probability distribution.
    Type: Grant
    Filed: April 18, 2016
    Date of Patent: March 5, 2019
    Assignee: QUALCOMM TECHNOLOGIES INTERNATIONAL, LTD.
    Inventors: Murray Robert Jarvis, James Burgess Tidd
  • Patent number: 10094931
    Abstract: Apparatuses, systems, and methods for mitigating the effects of null zones on the measurements of Global Navigation Satellite System (GNSS) receivers are described. In one aspect, a GNSS receiver calculates both a filtered value of an integrated and summed value for a punctual correlator of a satellite signal (“the calculated filtered punctual correlator value”) and an average of integrated and summed correlator values for a plurality of noise/offset correlators of the satellite signal (“the calculated average noise/offset correlator value”). The GNSS receiver then calculates a signal energy loss parameter ESL of the satellite signal using the calculated filtered punctual correlator value and the calculated average noise/offset correlator value and processes the satellite signal measurement based at least on the signal energy loss parameter ESL and a predetermined threshold ThSL presently corresponding to the punctual and noise/offset correlators of the satellite signal.
    Type: Grant
    Filed: May 19, 2016
    Date of Patent: October 9, 2018
    Assignee: Samsung Electronics Co., Ltd
    Inventor: Gary Lennen
  • Patent number: 10088573
    Abstract: One embodiment of the invention provides a receiver for use in a navigation system comprising multiple transmitters. Each transmitter transmits a positioning signal comprising a pseudo-random noise (PRN) sequence corresponding to the respective transmitter. The receiver comprises a code module for supplying multiple PRN sequences corresponding to the respective multiple transmitters; and a correlator for correlating the PRN sequences supplied by the code module with an incoming signal. The multiple PRN sequences are based on a single Sidelnikov/Lempel/Cohn/Eastman (SLCE) generative sequence uSLCE, and each of said multiple PRN sequences, denoted ui satisfies the equation: ui=uSLCE?TiuSLCE, where ? indicates element by element binary XOR addition, and Ti indicates a cyclic shift of i chips.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: October 2, 2018
    Assignee: EUROPEAN SPACE AGENCY
    Inventor: Stefan Wallner
  • Patent number: 9942061
    Abstract: Disclosed are a multipath selection method and device, and a storage medium. The method includes that: a correlation sequence between a received signal and a local reference signal is acquired by means of a correlation calculation method; a power spectrum of the correlation sequence and an average noise power of the received signal are acquired; according to the average noise power of the received signal, the power spectrum of the correlation sequence is divided into at least one first multipath component area and a second multipath component area according to a pre-set dividing rule; the at least one first multipath component area is searched according to a pre-set first noise threshold, so as to acquire a valid multipath component signal in the at least one first multipath component area; and the second multipath component area is searched according to a pre-set second noise threshold, so as to acquire a valid multipath component signal in the second multipath component area.
    Type: Grant
    Filed: October 9, 2014
    Date of Patent: April 10, 2018
    Assignee: Sanechips Technology Co., Ltd.
    Inventors: Zhongwei Liu, Ning Qiu, Haiyong Xiao, Yannan Xing
  • Patent number: 9857474
    Abstract: Described is a technology by which GPS-capable devices work with a cloud service to receive satellite visibility-related data. The satellite visibility-related data may be used to determine a location, and/or to abort a search for satellites. The cloud service may use crowd data from other GPS-capable devices. In one aspect, line-of-sight satellites are differentiated from other satellites, and used to determine which satellite signals are more trustworthy. Reflected signals also may be determined.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: January 2, 2018
    Assignee: MICROSOFT TECHNOLOGY LICENSING, LLC
    Inventors: Zhiyong Tan, David C. Chu, Lin Zhong, Paramvir Bahl
  • Patent number: 9702978
    Abstract: A test installation for simulating multiple reflections of GNSS signals, the installation including a top screen that is semitransparent in a radio frequency portion of the electromagnetic spectrum, wherein the top screen is substantially dome-shaped; a bottom screen that is reflective in the radio frequency portion of the electromagnetic spectrum; the top semitransparent screen over the bottom reflecting screen; and a GNSS antenna connected to a receiver and located between the top screen and the bottom screen.
    Type: Grant
    Filed: January 16, 2014
    Date of Patent: July 11, 2017
    Assignee: Topcon Positioning Systems, Inc.
    Inventors: Dmitry V. Tatarnikov, Ivan M. Chernetskiy
  • Patent number: 9681269
    Abstract: A mobile device adjusts the extents to which it depends on various satellites to estimate its global position based on the predicted probability for each such satellite that a ray extending from that satellite to the mobile device is obstructed by a building. The mobile device can predict the probabilities of building obstructions based on a digital model of the environment in which the mobile device is estimated to be. The mobile device weights the extent of uncertainty for each satellite's global positioning data based on the predicted probability of obstruction for that satellite. Using these weighted uncertainties, the mobile device selects the extents to which it relies on each satellite's global positioning data when estimating the mobile device's current global position.
    Type: Grant
    Filed: July 13, 2016
    Date of Patent: June 13, 2017
    Assignee: Apple Inc.
    Inventors: Glenn D. MacGougan, Robert W. Mayor, Kumar Chhokra
  • Patent number: 9618626
    Abstract: A navigation receiver operably coupled to an antenna can determine location by receiving and processing radiofrequency navigation signals from global navigation satellites. The navigation receiver includes a quartz crystal oscillator that serves as a reference frequency source for a local oscillator signal that is mixed with the radiofrequency navigation signals to generate intermediate signals at intermediate frequencies lower than the radiofrequencies. In particular applications, the quartz crystal oscillator and the antenna are subjected to vibration and shock. A shift in the frequency or phase of the intermediate signals can result, and performance of phase-lock loops can degrade. Performance is improved with a phase-lock loop that processes a combination of individual channel control signals and common control signals.
    Type: Grant
    Filed: April 11, 2013
    Date of Patent: April 11, 2017
    Assignee: Topcon Positioning Systems, Inc.
    Inventors: Andrey Vladimirovich Veitsel, Mark Isaakovich Zhodzishsky, Vladimir Victorovich Beloglazov, Dmitry Pavlovich Nikitin
  • Patent number: 9568609
    Abstract: An attenuated satellite positioning system (SPS) signal is acquired using long integration over multiple navigation data bits. To produce a stable internal clock signal to perform the long integration, an external clock signal is received from a highly stable source, such as a wireless communication base station or a nearby femtocell. An internal oscillator is driven at a desired frequency that is aligned with the scaled frequency of the external clock signal to produce the stable internal clock signal. The SPS signal is received and integrated for an extended period using the internal clock signal. Predicted SPS data may be received from an external source and used to perform coherent integration. Alternatively, non-coherent integration may be performed. Additionally, a motion sensor may be used to determine if there is motion relative to the external clock source or to compensate for Doppler errors in the external clock signal due to motion.
    Type: Grant
    Filed: May 2, 2014
    Date of Patent: February 14, 2017
    Assignee: QUALCOMM Incorporated
    Inventors: Mayur N. Shah, Wyatt Thomas Riley, Dominic Gerard Farmer
  • Patent number: 9484620
    Abstract: Various embodiments are disclosed for providing timing tracking loops in a communication system. A communication system includes a delay locked loop (DLL) comprising a maximum region detector configured to identify a target channel profile comprising at least a portion of the multipath signals based on the timing information, the maximum region detector further configured to apply a weight vector to each channel tap in the target channel profile and determine a tap with a maximum power level relative to remaining channel taps in the channel profile. The system further comprises a window timing loop (WTL) adjuster configured to track a position of a channel estimation window (CEW) within an observation window corresponding to the maximum channel energy level, where the maximum channel energy level corresponds to the sum of the energy of all the taps for a given window.
    Type: Grant
    Filed: August 1, 2012
    Date of Patent: November 1, 2016
    Assignee: Broadcom Corporation
    Inventor: Chun-Hsuan Kuo
  • Patent number: 9408175
    Abstract: A mobile device adjusts the extents to which it depends on various satellites to estimate its global position based on the predicted probability for each such satellite that a ray extending from that satellite to the mobile device is obstructed by a building. The mobile device can predict the probabilities of building obstructions based on a digital model of the environment in which the mobile device is estimated to be. The mobile device weights the extent of uncertainty for each satellite's global positioning data based on the predicted probability of obstruction for that satellite. Using these weighted uncertainties, the mobile device selects the extents to which it relies on each satellite's global positioning data when estimating the mobile device's current global position.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: August 2, 2016
    Assignee: APPLE INC.
    Inventors: Glenn D. MacGougan, Robert W. Mayor, Kumar Chhokra
  • Patent number: 9279886
    Abstract: A method and a receiver for receiving positioning signals are disclosed. The positioning signals are received from a plurality of first sources in a first frequency range and from a plurality of second sources in a second frequency range different from the first frequency range. The receiver is switched between the first and second frequency ranges to receive the positioning signals, and the receiver obtains time offset information about a time taken to switch the receiver between the first and second frequency ranges, by obtaining a solution to a set of simultaneous equations based on combined navigation data for the first and second sources.
    Type: Grant
    Filed: February 7, 2013
    Date of Patent: March 8, 2016
    Assignee: Samsung Electronics Co., Ltd
    Inventor: Mahmoud Hadef
  • Publication number: 20150149073
    Abstract: An object of the present invention is to provide a positioning device which can more reliably and frequently correct a own vehicle position earlier, reliably detect an error matching state or a straying state earlier and correct the position to a correct position. The positioning device according to the present invention includes a GPS receiver, a GPS position calculating unit which calculates pseudo distances to the GPS satellites based on the transmission signals, and calculates a re-calculated GPS position which is the own vehicle position based on the pseudo distances, and a multipath influence evaluating unit which evaluates a multipath influence on the GPS position based on a difference between the GPS position calculated by the GPS receiver and the re-calculated GPS position calculated by the GPS position calculating unit.
    Type: Application
    Filed: June 27, 2012
    Publication date: May 28, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Tadatomi Ishigami, Atsushi Maeda, Masatoshi Fujii, Hirokazu Chiyonobu, Kohei Fujimoto
  • Publication number: 20150138015
    Abstract: An object is to provide in a positioning device of a moving body such as a vehicle, a technique which can modify a built-in clock error of a moving body to increase accuracy of a velocity. The positioning device includes a built-in clock error estimating unit which estimates a built-in clock error of the vehicle as a built-in clock error based on a difference between a delta range and a calculated range rate, and a range rate estimating unit which estimates a vehicle stop range rate based on position and velocity of GPS satellite based on transmission signal and a vehicle position, and modifies a calculated range rate, based on the built-in clock error. Further, the positioning device includes an own vehicle velocity calculating unit which calculates own vehicle velocities in three axial directions which form an orthogonal coordinate system, based on a navigation matrix, the vehicle stop range rate and the modified calculated range rate.
    Type: Application
    Filed: June 27, 2012
    Publication date: May 21, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Tadatomi Ishigami, Atsushi Maeda, Masatoshi Fujii, Hirokazu Chiyonobu, Kohei Fujimoto
  • Publication number: 20150116150
    Abstract: Systems, methods and devices for improving the accuracy of GNSS data are provided. Specifically, embodiments of the invention can advantageously use sensor input to improve the accuracy of position fixes. The use of physical 5 sensors in navigation systems is deemed particularly advantageous, especially where altitude data derived from the pressure sensor is calibrated with and/or blended with GNSS altitude data.
    Type: Application
    Filed: January 6, 2015
    Publication date: April 30, 2015
    Inventor: Lionel Jacques Garin
  • Patent number: 9007260
    Abstract: A method and apparatus for estimating and compensating for a broad class of non-Gaussian sensor and process noise. In one example, a coded filter combines a dynamic state estimator (for example, a Kalman filter) and a non-linear estimator to provide approximations of the non-Gaussian process and sensor noise associated with a dynamic system. These approximations are used by the dynamic state estimator to correct sensor measurements or to alter the dynamic model governing evolution of the system state. Examples of coded filters leverage compressive sensing techniques in combination with error models based on concepts of compressibility and the application of efficient convex optimization processes.
    Type: Grant
    Filed: June 23, 2011
    Date of Patent: April 14, 2015
    Assignee: The Charles Stark Draper Laboratory, Inc.
    Inventors: Yaron Rachlin, Rami Mangoubi, Michael F. McManus, Christopher C. Yu
  • Patent number: 8941537
    Abstract: The invention, in some embodiments, relates to the field of global navigation satellite systems, and more particularly to the field of methods and devices for identifying whether a satellite in a global navigation satellite system has a line of sight to a specific global navigation satellite system receiver (LOS satellite) or does not have a line of sight to the global navigation satellite system receiver (NLOS satellite).
    Type: Grant
    Filed: January 3, 2013
    Date of Patent: January 27, 2015
    Assignee: Ariel-University Research and Development Company Ltd.
    Inventors: Boaz Ben-Moshe, Nir Shvalb
  • Publication number: 20150015437
    Abstract: A method comprises generating a respective code-carrier difference for each of a plurality of satellite vehicle and signal frequency combinations, wherein the code-carrier difference is based on a code range and a carrier range. The method also comprises filtering the respective code-carrier difference for an unknown bias and random noise; determining whether multipath is present for each of the plurality of satellite vehicle and signal frequency combinations based on the respective filtered code-carrier difference; and computing a position solution based on trust placed in respective measurements from each of the plurality of satellite vehicle and signal frequency combinations, the trust based on whether multipath is present for the respective satellite vehicle and signal frequency combination.
    Type: Application
    Filed: July 9, 2013
    Publication date: January 15, 2015
    Applicant: Honeywell International Inc.
    Inventors: Brian W. Schipper, Mahesh K. Jeerage
  • Publication number: 20150015436
    Abstract: A method for calibrating spatial errors induced by phase biases having a detrimental effect on the measurements of phase differences of radio signals received by three unaligned receiving antennas of a vehicle. An inter-satellite angular deviation of a pair of satellites is estimated in two different ways: on the basis of the respective positions of the vehicle and of the satellites to obtain a theoretical inter-satellite angular deviation; and on the basis of the respective directions of incidence of the satellites relative to the vehicle, which are determined from phase measurements, to obtain an estimated inter-satellite angular deviation. The space errors are estimated on the basis of said theoretical and estimated inter-satellite angular deviations. Also, a method and system for estimating the attitude of a vehicle, in particular a spacecraft.
    Type: Application
    Filed: March 28, 2013
    Publication date: January 15, 2015
    Applicant: AIRBUS DEFENCE AND SPACE SAS
    Inventors: Renaud Broquet, Bernard Polle, Johan Montel
  • Publication number: 20140375494
    Abstract: A positioning system operates by first determining that a user is pedestrian, and then estimating a speed of the user. Having tracked a first signal from one radio transmitter whose position is known, the system attempts to detect additional signals from the one transmitter, in a search space such that the first signal and the or each additional signal are consistent with the estimated speed of the user and with one or more of the signals having been reflected off a reflector in the vicinity of the user. One or more detected additional signals from the one transmitter are then tracked, and candidate measurements, derived from the first signal and the one or more detected additional signals, are provided for use when estimating the position and/or velocity of the user.
    Type: Application
    Filed: June 20, 2014
    Publication date: December 25, 2014
    Inventors: Peter FLEMING, Geraint FFOULKES-JONES, Gerald WHITWORTH
  • Publication number: 20140333476
    Abstract: The invention, in some embodiments, relates to the field of global navigation satellite systems, and more particularly to the field of methods and devices for identifying whether a satellite in a global navigation satellite system has a line of sight to a specific global navigation satellite system receiver (LOS satellite) or does not have a line of sight to the global navigation satellite system receiver (NLOS satellite).
    Type: Application
    Filed: January 3, 2013
    Publication date: November 13, 2014
    Applicant: ARIEL-UNIVERSITY RESEARCH AND DEVELOPMENT COMPANY, LTD.
    Inventors: Boaz Ben-Moshe, Nir Shvalb
  • Patent number: 8843313
    Abstract: A method, system, and apparatus are disclosed for multipath isolation through the combined use of antenna diversity and frequency diversity. In particular, the present disclosure utilizes antenna diversity and frequency diversity to combat the deleterious effects of reflected signals on the positioning accuracy of satellite navigation systems. In at least one embodiment, the present disclosure uses two antennas and two frequencies for operation with a satellite navigation system. The present disclosure segregates the antennas and frequencies into two classes: references and monitors. The reference measurements are used for estimating the state of the vehicle, and the monitor measurements are used to detect faults that might degrade the reference estimation. Thus, the present disclosure enables an improvement in the positioning error experienced by roving users in downtown and indoor environments.
    Type: Grant
    Filed: June 13, 2012
    Date of Patent: September 23, 2014
    Assignee: The Boeing Company
    Inventors: Per K. Enge, Bart Ferrell, Gregory M. Gutt, James C. Lassa, Michael A. Rizzo, David A. Whelan
  • Patent number: 8768611
    Abstract: A navigation receiver mounted on a moving vehicle receives navigation signals transmitted from global navigation satellites. The navigation signals are separated into direct navigation signals, navigation signals reflected from an object, and navigation signals reflected from an environmental surface. The signal separation is based on algorithms including various combinations of signal strength, change in signal strength, delay time, spectral width, change in spectral width, and user-defined thresholds. The navigation signals reflected from an environmental surface are eliminated from further processing. The position of the navigation receiver is calculated based on the direct navigation signals. The object is detected, and the position of the object is calculated, based on the navigation signals reflected from the object. If the object is determined to lie in the path of the moving vehicle, a command can be generated to avoid collision between the moving vehicle and the object.
    Type: Grant
    Filed: April 24, 2012
    Date of Patent: July 1, 2014
    Assignee: Topcon Positioning Systems Inc.
    Inventors: Yury G. Sosulin, Dmitry V. Tatarnikov
  • Patent number: 8760343
    Abstract: A global navigation system includes a first navigation receiver located in a rover and a second navigation receiver located in a base station. Single differences of measurements of satellite signals received at the two receivers are calculated and compared to single differences derived from an observation model. Anomalous measurements are detected and removed prior to performing computations for determining the output position of the rover and resolving integer ambiguities. Detection criteria are based on the residuals between the calculated and the derived single differences. For resolving integer ambiguities, computations based on Cholesky information Kalman filters and Householder transformations are advantageously applied. Changes in the state of the satellite constellation from one epoch to another are included in the computations.
    Type: Grant
    Filed: November 10, 2010
    Date of Patent: June 24, 2014
    Assignee: Topcon Positioning Systems, Inc.
    Inventors: Daniel Milyutin, Andrey Plenkin
  • Publication number: 20140125521
    Abstract: A method includes estimating a position of a receiver, aboard a moving object, on the basis of the navigation signals emitted by satellites received by an antenna in an antenna array placed on the moving object, and using a three-dimensional geographical map to deduce, geometrically, on the basis of the position of the receiver and of a ray casting starting from the receiver, the number of paths reflected on walls of buildings present in a scene corresponding to an environment surrounding the receiver. The determined number of reflected paths is used to initialize an algorithm for estimating angles of arrival of multi-paths to deduce therefrom angles of arrival of the paths reflected on the walls before reaching the receiver. Optionally, the method can comprise making it possible to bound the distance information error due to a multi-path to render the estimation of direction of arrival of the signals more efficacious.
    Type: Application
    Filed: February 10, 2013
    Publication date: May 8, 2014
    Applicants: CENTRE NATIONAL D'ETUDES SPATIALES (CNES), THALES
    Inventors: Thales, Centre National D'etudes Spatiales (CNES)
  • Patent number: 8717233
    Abstract: A method for mitigating the effects of multipath errors in GNSS devices is provided. Signals from GNSS satellites are received. Image data from an image sensor is received. Orientation data from an orientation sensor is received. The orientation data describes the orientation of the image sensor. Obstruction data is determined based on the image data. The obstruction data includes an obstruction region that indicates the sky in that region is obstructed by a structure. Based on the orientation data, obstruction data, and GNSS satellite location data, the position of GNSS satellites with respect to the obstruction region is determined. The location of the GNSS device is determined based on signals from some of the GNSS satellites and the position of GNSS satellites with respect to the obstruction region.
    Type: Grant
    Filed: November 21, 2011
    Date of Patent: May 6, 2014
    Assignee: Javad GNSS, Inc.
    Inventors: Javad Ashjaee, Mikhail Gribkov
  • Patent number: 8692710
    Abstract: Embodiments of the invention involve providing assistance data to a global position and navigation receiver, for example topographical data, such that the receiver can decide on a specific action depending on that data. The topographical data may include one or both of geographical data and architectural data. Geographical data may include information about natural formations, such as hills, valleys, forests, etc. Architectural data may include manmade formations, such as streets, buildings, bridges, etc. The receiver may then interpret and decide on a course of action for controlling the receiver base on the assistance data.
    Type: Grant
    Filed: August 31, 2007
    Date of Patent: April 8, 2014
    Assignee: SiGe Semiconductor (Europe) Limited
    Inventors: Ben Tarlow, Stuart Strickland
  • Patent number: 8669900
    Abstract: A method for reducing multipath when determining a location of a stationary or near stationary position, includes receiving a signal from an antenna moving continuously with respect to the stationary or near stationary position, the signal including a multipath component, processing the received signal including the multipath component, wherein multipath error in the received signal is reduced during the processing and determining a location of the stationary or near stationary position based on the processed received signal with the multipath error reduced.
    Type: Grant
    Filed: November 17, 2010
    Date of Patent: March 11, 2014
    Assignee: Trimble Navigation Limited
    Inventor: Ulrich Vollath
  • Publication number: 20140028497
    Abstract: A method for reducing multipath when determining a location of a stationary or near stationary position, includes receiving a signal from an antenna moving continuously with respect to the stationary or near stationary position, the signal including a multipath component, processing the received signal including the multipath component, wherein multipath error in the received signal is reduced during the processing and determining a location of the stationary or near stationary position based on the processed received signal with the multipath error reduced.
    Type: Application
    Filed: October 2, 2013
    Publication date: January 30, 2014
    Applicant: TRIMBLE NAVIGATION LIMITED
    Inventor: Ulrich VOLLATH
  • Patent number: 8629806
    Abstract: A GPS receiver for tracking a GPS signal. The receiver generates a mixed GPS signal by mixing the GPS signal with an oscillator signal, generates a first correlation signal by correlating the mixed GPS signal with a reference signal, and generates a filtered GPS signal from the GPS signal. The receiver also generates a filtered reference signal from the reference signal, generates a second correlation signal by correlating the filtered GPS signal with the filtered reference signal, and a generates a combined correlation signal by combining the first correlation signal with the second correlation signal. The receiver tracks the GPS signal by adjusting the phase of the oscillator signal based on the combined correlation signal.
    Type: Grant
    Filed: January 4, 2013
    Date of Patent: January 14, 2014
    Assignee: CSR Technology Inc.
    Inventor: Nam Dieu Banh
  • Publication number: 20130335268
    Abstract: A method, system, and apparatus are disclosed for multipath isolation through the combined use of antenna diversity and frequency diversity. In particular, the present disclosure utilizes antenna diversity and frequency diversity to combat the deleterious effects of reflected signals on the positioning accuracy of satellite navigation systems. In at least one embodiment, the present disclosure uses two antennas and two frequencies for operation with a satellite navigation system. The present disclosure segregates the antennas and frequencies into two classes: references and monitors. The reference measurements are used for estimating the state of the vehicle, and the monitor measurements are used to detect faults that might degrade the reference estimation. Thus, the present disclosure enables an improvement in the positioning error experienced by roving users in downtown and indoor environments.
    Type: Application
    Filed: June 13, 2012
    Publication date: December 19, 2013
    Applicant: THE BOEING COMPANY
    Inventors: Per K. Enge, Bart Ferrell, Gregory M. Gutt, James C. Lassa, Michael A. Rizzo, David A. Whelan
  • Publication number: 20130321202
    Abstract: The present invention relates generally to methods and apparatuses for estimating and correcting for multipath in GNSS navigation systems. According to some aspects, the invention takes advantage of situations where position and estimated position error are reasonably stable so as to detect when large multipath errors are present with confidence. After detection, the slowly varying biases from multipath or other un-modeled sources can be modeled separately from the navigation state. This makes it possible to keep the measurements in the solution without biasing the navigation state and further ignores the long-term biases for use over short-term periods with minimized pseudorange error when necessary.
    Type: Application
    Filed: May 30, 2012
    Publication date: December 5, 2013
    Applicant: CSR Technology Inc.
    Inventors: Xiangdong Lin, David Allan Tuck, Mangesh Chansarkar
  • Patent number: 8599067
    Abstract: A global positioning satellite (GPS) receiver that includes a radio frequency (RF) receiver receiving a first GPS signal from a GPS satellite and a processor. The processor is configured to correlate the first GPS signal with a plurality of reference signals to produce a plurality of correlations, detect a transition between receiving the first GPS signal and receiving a second GPS signal from the GPS satellite based on a phase shift in the correlations, and if the transition is detected, compensate for the phase shift when computing a range to the GPS satellite.
    Type: Grant
    Filed: July 26, 2011
    Date of Patent: December 3, 2013
    Assignee: Cambridge Silicon Radio Ltd.
    Inventor: Gary Lennen
  • Patent number: 8508406
    Abstract: A method of estimating a position of a satellite receiver, comprising computing a weight matrix, and computing an estimated position of the satellite receiver based on the weight matrix, wherein computing the weight matrix includes computing quantities indicative of degradations experienced by satellite signals and of multipath interference, and computing the weight matrix based on the computed quantities.
    Type: Grant
    Filed: March 20, 2008
    Date of Patent: August 13, 2013
    Assignee: Telespazio S.p.A.
    Inventors: Filippo Rodriguez, Gian Paolo Plaia
  • Publication number: 20130162473
    Abstract: An antenna includes a waveguide having an aperture at a first end and a conducting component at a second end, the conducting component shorting the waveguide and a first set of two orthogonal dipoles, fed in quadrature, the orthogonal dipoles located near the aperture of the waveguide operating close to its dominant mode cut off frequency.
    Type: Application
    Filed: September 17, 2012
    Publication date: June 27, 2013
    Applicant: UTI LIMITED PARTNERSHIP
    Inventors: Ronald H. Johnston, Elise Fear
  • Patent number: 8471764
    Abstract: A method for estimating hidden channel parameters of a GNSS navigation signal received in a multipath environment includes a sequential Bayesian estimation. A movement model forms the basis of the estimation and is designed especially for dynamic channel scenarios and takes into account the speeds of change and the variable life cycles of the path. The estimator is implemented as a recursive Bayesian filter for a combined determination of positions and suppression of multipaths. The binding of the delay of the direct path is taken into consideration via position and clock parameters. The method is carried out with GNSS satellite navigation receivers, e.g. GPS and Galileo. With the method, multipath error of received GNSS navigation signals is reduced. The multipath channel includes a direct path and Nm-I echo signals and each of these paths may be considered on or off for the estimation.
    Type: Grant
    Filed: March 25, 2009
    Date of Patent: June 25, 2013
    Assignee: Deutsches Zentrum für Luft- und Raumfahrt e.V.
    Inventors: Bernhard Krach, Michael Lentmaier, Patrick Robertson
  • Patent number: 8395544
    Abstract: A GNSS enabled communication device receives GNSS signals from GNSS satellites. The resulting GNSS baseband signals may be concurrently correlated with GNSS acquisition codes. Inter-delay products for the received GNSS signals may be generated utilizing the correlation IQ samples. The inter-delay products are utilized to calculate either an open loop or a close-loop estimate for inter-delay phase coherence of the received GNSS signals. A test statistic, generated from the inter-delay products, may be compared with a preset or dynamically determined threshold value in order to detect or declare signal degradation effects in the received GNSS signals. The early and late delays for the inter-delay phase coherence may be generalized to two or more delays. In this regard, the correlation IQ samples may be utilized to generate a correlation matrix. Variations derived from the correlation matrix may be utilized to declare or detect signal degradation effects in the received GNSS signals.
    Type: Grant
    Filed: October 12, 2010
    Date of Patent: March 12, 2013
    Assignee: Broadcom Corporation
    Inventor: Jason Goldberg
  • Patent number: 8395543
    Abstract: A method and apparatus for mitigating multipath effects in a satellite signal receiver is described. In one example, measured pseudoranges are obtained from the satellite signal receiver to a plurality of satellites. For each measured pseudorange: an expected pseudorange is derived from a sequential estimation filter in the satellite signal receiver. The measured pseudorange and the expected pseudorange are differenced to compute a pseudorange residual. The measured pseudorange is applied to the sequential estimation filter only if the pseudorange residual is within a window.
    Type: Grant
    Filed: July 3, 2007
    Date of Patent: March 12, 2013
    Assignee: Global Locate, Inc.
    Inventors: Frank van Diggelen, Charles Abraham, Sergei Podshivalov
  • Publication number: 20130057430
    Abstract: An apparatus and method correct position information of a portable terminal in a multi-path zone. The method includes determining whether the portable terminal has entered a multi-path zone, and detecting a second GPS satellite transmitting accurate position information, among one or more first GPS satellites transmitting position information to the portable terminal, when the portable terminal has entered the multi-path zone. The method also includes receiving position information of the portable terminal from the second GPS satellite, and storing coordinates of the second GPS satellite.
    Type: Application
    Filed: September 5, 2012
    Publication date: March 7, 2013
    Applicant: Samsung Electronics Co., Ltp.
    Inventor: Seung-Hyun Yoon
  • Patent number: 8368592
    Abstract: A GPS receiver for tracking a GPS signal. The receiver generates a mixed GPS signal by mixing the GPS signal with an oscillator signal, generates a first correlation signal by correlating the mixed GPS signal with a reference signal, and generates a filtered GPS signal from the GPS signal. The receiver also generates a filtered reference signal from the reference signal, generates a second correlation signal by correlating the filtered GPS signal with the filtered reference signal, and a generates a combined correlation signal by combining the first correlation signal with the second correlation signal. The receiver tracks the GPS signal by adjusting the phase of the oscillator signal based on the combined correlation signal.
    Type: Grant
    Filed: January 19, 2011
    Date of Patent: February 5, 2013
    Assignee: CSR Technology Inc.
    Inventor: Nam Dieu Banh
  • Patent number: 8358244
    Abstract: A multipath signal evaluation method includes, carrying out a correlation calculation on a received signal from a positioning satellite to obtain a peak correlation value, and determining reliability for a received multipath signal by using the peak correlation value and a correlation value at a phase delayed from a peak phase in which the peak correlation is obtained.
    Type: Grant
    Filed: June 25, 2010
    Date of Patent: January 22, 2013
    Assignee: Seiko Epson Corporation
    Inventor: Tsubasa Shirai
  • Patent number: 8344947
    Abstract: The location of a receiver is determined by receiving respective ranging signals from each of a plurality of transmitters at known locations. The ranging signals are cross-correlated with respective model signals to provide respective cross-correlation functions. For cross correlation functions that are determined to include multipath noise, the multipath noise is estimated and removed. Respective delays of the cross-correlation functions are estimated and the location of the receiver is inferred from the delays.
    Type: Grant
    Filed: September 14, 2010
    Date of Patent: January 1, 2013
    Assignee: Cellguide Ltd.
    Inventor: Moshe Tocker
  • Publication number: 20120319898
    Abstract: An existence of multipath is detected accurately based on not only a C/No. A C/No (iv) of a reception signal, a pseudorange PR(iv), and a delta range DR(iv) are acquired (S101). First, as determination processing based on individual measurement values, thresholds are set thereto respectively, and the existence of multipath is detected (S102-S104). Next, as determination processing based on continuous values, an average value C/No(Av) and a standard deviation ?C/No of the C/No, and an average value DV(Av) and a standard deviation ?DV of the difference values are calculated, thresholds are similarly set thereto respectively, and the existence of multipath is determined (S105-S109). Then, if multipath is determined that it does not exist based on the individual measurement values and the continuous values, it is determined ultimately that multipath does not exist (S110).
    Type: Application
    Filed: February 23, 2011
    Publication date: December 20, 2012
    Applicant: FURUNO ELECTRIC COMPANY LTD.
    Inventors: Takaki Tominaga, Takuji Yasumoto
  • Patent number: RE46879
    Abstract: A system implements a location based service, and comprises a satellite navigation receiver implementing a position tracking function for providing the location of a user of the service. An analogue RF receiver receives satellite signals and performs at least a frequency downconversion. Correlation and decoding functions are applied to the downconverted signals for deriving location information from detected specific satellite signals. The system further comprises a server for receiving samples of the downconverted signals, and for verifying the samples are consistent with the expected satellite signals at that time and location. The invention provides a counter measure for detecting the counterfeiting of, or tampering with, the satellite signals at the receiver. A check can be made that the received satellite signals correspond to those which are expected at that location and time.
    Type: Grant
    Filed: June 24, 2015
    Date of Patent: May 29, 2018
    Assignee: Telit Automotive Solutions NV
    Inventors: Frank C. H. Daems, Johan F. J. Peeters