Patents Assigned to Skyhook Wireless, Inc.
  • Patent number: 8103288
    Abstract: A method for estimating the speed and bearing of a Wi-Fi enabled device using WLAN radio signals in a WLAN based location service is provided. A method used to estimate a speed of travel of a Wi-Fi enabled device comprises the Wi-Fi enabled device receiving signals transmitted by Wi-Fi access points in range of the Wi-Fi enabled device, and using the signals to estimate the speed of and/or direction of travel of the Wi-Fi enabled device.
    Type: Grant
    Filed: June 18, 2009
    Date of Patent: January 24, 2012
    Assignee: Skyhook Wireless, Inc.
    Inventors: Farshid Alizadeh-Shabdiz, Kaveh Pahlavan, Edward James Morgan
  • Publication number: 20120007775
    Abstract: The disclosed subject matter generally relates to hybrid positioning systems and methods and, more specifically, systems and methods of detecting moved WLAN assess points using a wireless local area network based positioning system (WLAN-PS) and a satellite-based positioning system (SPS) with at least two satellites measurement.
    Type: Application
    Filed: August 17, 2011
    Publication date: January 12, 2012
    Applicant: SKYHOOK WIRELESS, INC.
    Inventor: Farshid ALIZADEH-SHABDIZ
  • Patent number: 8089398
    Abstract: This disclosure describes methods and systems for stationary user detection in a hybrid location system. In some embodiments, the method for determining whether a satellite enabled device is stationary by measuring the Doppler frequency of received satellite signals can include acquiring satellite measurements from at least two satellites, wherein the satellite measurements include Doppler frequency measurements, acquiring a rough estimate of location of the satellite enabled device and calculating an internal frequency offset of satellite enabled device.
    Type: Grant
    Filed: June 5, 2009
    Date of Patent: January 3, 2012
    Assignee: Skyhook Wireless, Inc.
    Inventor: Farshid Alizadeh-Shabdiz
  • Patent number: 8089399
    Abstract: This disclosure describes a system and method for refining a WLAN-PS estimated location using satellite measurements. In some embodiments, the disclosure relates to a method of determining the location of a WLAN and satellite enabled device by using two or more satellite measurements to refine an initial WLAN based location determination. The method can include estimating a position of the WLAN and satellite enabled device using a WLAN positioning system, gathering satellite location measurements from at least two satellites, determining an uncertainty area around the WLAN location estimate based on the expected error of the WLAN location estimate, wherein the uncertainty area has a plurality of possible location solutions, and determining the device location estimate inside the WLAN location uncertainty that best satisfies the satellite measurements.
    Type: Grant
    Filed: June 5, 2009
    Date of Patent: January 3, 2012
    Assignee: Skyhook Wireless, Inc.
    Inventor: Farshid Alizadeh-Shabdiz
  • Patent number: 8090386
    Abstract: A method for estimating the speed and bearing of a Wi-Fi enabled device using WLAN radio signals in a WLAN based location service is provided. A method used to estimate a speed of travel of a Wi-Fi enabled device comprises the Wi-Fi enabled device receiving signals transmitted by Wi-Fi access points in range of the Wi-Fi enabled device, and using the signals to estimate the speed of and/or direction of travel of the Wi-Fi enabled device.
    Type: Grant
    Filed: November 12, 2010
    Date of Patent: January 3, 2012
    Assignee: Skyhook Wireless, Inc.
    Inventors: Farshid Alizadeh-Shabdiz, Edward James Morgan, Kaveh Pahlavan
  • Publication number: 20110317579
    Abstract: A location beacon database and server, method of building location beacon database, and location based service using same. Wi-Fi access points are located in a target geographical area to build a reference database of locations of Wi-Fi access points. At least one vehicle is deployed including at least one scanning device having a GPS device and a Wi-Fi radio device and including a Wi-Fi antenna system. The target area is traversed in a programmatic route to reduce arterial bias. The programmatic route includes substantially all drivable streets in the target geographical area and solves an Eulerian cycle problem of a graph represented by said drivable streets. While traversing the target area, Wi-Fi identity information and GPS location information is detected. The location information is used to reverse triangulate the position of the detected Wi-Fi access point; and the position of the detected access point is recorded in a reference database.
    Type: Application
    Filed: September 6, 2011
    Publication date: December 29, 2011
    Applicant: Skyhook Wireless, Inc.
    Inventors: Russel K. Jones, Farshid Alizadeh-Shabdiz, Edward J. Morgan, Michael G. Shean
  • Publication number: 20110306361
    Abstract: Methods of and systems for measuring beacon stability of wireless access points are provided. A method of determining a measure of likelihood that a designated wireless device exhibits at least one pathological characteristic includes determining a set of reference points associated with a designated wireless device, and retrieving attributes of the reference points, attributes associated with other wireless devices related to the designated wireless device, and/or statistical information. The statistical information includes a temporal distribution of detection of signals of reference points, a spatial distribution of the reference points, and/or a cardinality of the set or a subset of the reference points. The method further includes determining a measure of likelihood that the designated wireless device exhibits at least one pathological characteristic based on attributes of the reference points, attributes associated with the reception of signals, and/or the statistical information.
    Type: Application
    Filed: June 9, 2011
    Publication date: December 15, 2011
    Applicant: SKYHOOK WIRELESS, INC.
    Inventors: Farshid ALIZADEH-SHABDIZ, Nicolas BRACHET, Gerald CAVANAUGH, Andrei DANCUS, Russel K. JONES, Christopher STEGER
  • Publication number: 20110306359
    Abstract: Systems for and methods of determining likelihood of relocation of reference points in a positioning system are disclosed. A method of determining a measure of likelihood that an estimated geographic location of a designated wireless device is not its accurate present location includes determining a set of reference points associated with the device, which are a geographic position at which signals from the device were detected and/or other devices having a relationship with the designated device. The existence of the relationship is based on the devices being within signal reception range of a same position within a selected period of time. The method includes retrieving attributes of the reference points and/or of the relationships and determining a measure of likelihood that an estimated geographic location associated with the designated device is not its present location based on the attributes of the reference points of the set and/or of the relationships.
    Type: Application
    Filed: June 9, 2011
    Publication date: December 15, 2011
    Applicant: SKYHOOK WIRELESS, INC.
    Inventors: Farshid ALIZADEH-SHABDIZ, Nicolas BRACHET, Gerald CAVANAUGH, Andrei DANCUS, Russel K. JONES, Christopher STEGER
  • Publication number: 20110306357
    Abstract: Systems for and methods of determining likelihood of atypical transmission characteristics of reference points in a positioning system are disclosed. A method of determining a measure of likelihood that a designated wireless device exhibits signal transmission characteristics atypical of a wireless device of a type matching the designated device includes determining reference points associated with the designated device, which are a geographic position at which signals from the designated device were detected and/or another wireless device from which signals were also detected by a receiver within a selected period of time during which the signals from the designated device were detected.
    Type: Application
    Filed: June 9, 2011
    Publication date: December 15, 2011
    Applicant: SKYHOOK WIRELESS, INC.
    Inventors: Farshid ALIZADEH-SHABDIZ, Nicolas BRACHET, Gerald CAVANAUGH, Andrei DANCUS, Russel K. JONES, Christopher STEGER
  • Publication number: 20110306360
    Abstract: Systems for and methods of determining likelihood of mobility of reference points in a positioning system are disclosed. A method of determining a measure of likelihood that a designated wireless device is a mobile device includes determining a set of reference points associated with a designated wireless device. The reference points are a geographic position at which signals from the device were detected and/or another wireless device from which signals were also detected by a receiver within a selected period of time during which the signals from the designated device were detected. The method also includes retrieving statistical information about a temporal distribution of detection of signals of reference points, a spatial distribution of the reference points, and/or a cardinality of the reference points. The method includes determining a measure of likelihood that the designated wireless device is a mobile wireless device based on the statistical information.
    Type: Application
    Filed: June 9, 2011
    Publication date: December 15, 2011
    Applicant: SKYHOOK WIRELESS, INC.
    Inventors: Farshid ALIZADEH-SHABDIZ, Nicolas BRACHET, Gerald CAVANAUGH, Andrei DANCUS, Russel K. JONES, Christopher STEGER
  • Publication number: 20110306358
    Abstract: Systems for and methods of determining likelihood of reference point identity duplication in a positioning system are disclosed. A method of determining a measure of likelihood that a designated identifier is shared by wireless devices includes determining reference points associated with any wireless device having a designated identifier. The reference points are a geographic position at which signals from any of the wireless devices were detected and/or wireless devices from which signals were also detected within a selected period of time during which the signals from any of the wireless devices having the designated identifier were detected. The method also includes determining statistical information about a temporal distribution of detection of signals of reference points, a spatial distribution of the reference points, and/or a cardinality of the reference points and determining a measure of likelihood that the designated identifier is shared by wireless devices is based on the statistical information.
    Type: Application
    Filed: June 9, 2011
    Publication date: December 15, 2011
    Applicant: SKYHOOK WIRELESS, INC.
    Inventors: Farshid ALIZADEH-SHABDIZ, Nicolas BRACHET, Gerald CAVANAUGH, Andrei DANCUS, Russel K. JONES, Christopher STEGER
  • Publication number: 20110298659
    Abstract: This disclosure describes a system and method for using a satellite positioning system to filter WLAN access points in a hybrid positioning system. In some embodiments, the method can include detecting WLAN APs in range of the WLAN and satellite enabled device, obtaining satellite measurements from at least two satellites to provide a plurality of possible satellite locations of the device, and providing a weight for each AP based on the distance from the WLAN APs to the possible satellite locations of the device.
    Type: Application
    Filed: August 15, 2011
    Publication date: December 8, 2011
    Applicant: SKYHOOK WIRELESS, INC.
    Inventor: Farshid ALIZADEH-SHABDIZ
  • Publication number: 20110298663
    Abstract: The disclosed subject matter generally relates to hybrid positioning systems and methods and, more specifically, systems and methods of detecting moved WLAN assess points using a wireless local area network based positioning system (WLAN-PS) and a satellite-based positioning system (SPS) with at least two satellites measurement.
    Type: Application
    Filed: August 17, 2011
    Publication date: December 8, 2011
    Applicant: SKYHOOK WIRELESS, INC.
    Inventor: Farshid ALIZADEH-SHABDIZ
  • Publication number: 20110298660
    Abstract: The disclosed subject matter generally relates to hybrid positioning systems and methods and, more specifically, systems and methods of detecting moved WLAN assess points using a wireless local area network based positioning system (WLAN-PS) and a satellite-based positioning system (SPS) with at least two satellites measurement.
    Type: Application
    Filed: August 17, 2011
    Publication date: December 8, 2011
    Applicant: SKYHOOK WIRELESS, INC.
    Inventor: Farshid ALIZADEH-SHABDIZ
  • Publication number: 20110298664
    Abstract: The disclosed subject matter generally relates to hybrid positioning systems and methods and, more specifically, systems and methods of detecting moved WLAN assess points using a wireless local area network based positioning system (WLAN-PS) and a satellite-based positioning system (SPS) with at least two satellites measurement.
    Type: Application
    Filed: August 17, 2011
    Publication date: December 8, 2011
    Applicant: SKYHOOK WIRELESS, INC.
    Inventor: Farshid ALIZADEH-SHABDIZ
  • Publication number: 20110287783
    Abstract: The invention features a method of estimating an expected error of a position estimate for use in a WLAN positioning system that estimates the position of a WLAN-enabled device. The WLAN-enabled device receives signals transmitted by a WLAN access point in range of the WLAN-enabled device. The method estimates the position of the WLAN-enabled device based on the received signals from the WLAN access point in range of the WLAN enabled device. The method also estimates an expected error of the position estimate based on characteristics of the WLAN access point in range of the WLAN enabled device, wherein the expected error predicts a relative accuracy of the position estimate.
    Type: Application
    Filed: August 9, 2011
    Publication date: November 24, 2011
    Applicant: Skyhook Wireless, Inc.
    Inventors: Farshid ALIZADEH-SHABDIZ, Edward J. MORGAN
  • Patent number: 8063820
    Abstract: The disclosed subject matter generally relates to hybrid positioning systems and methods, more specifically, systems and methods of integrating a wireless local area network (WLAN) based positioning system (WLAN-PS) and a satellite positioning system (SPS) to improve accuracy of location estimates by selecting the best set of measurements from both systems.
    Type: Grant
    Filed: July 16, 2009
    Date of Patent: November 22, 2011
    Assignee: Skyhook Wireless, Inc.
    Inventor: Farshid Alizadeh-Shabdiz
  • Patent number: 8054219
    Abstract: This disclosure describes a method and system for determining position using a WLAN-PS estimated position as an initial position. In some embodiments, the method can include calculating a WLAN position estimate of the WLAN and satellite enabled device and using the WLAN position estimate as an initial position in satellite position system to determine the location of the WLAN and satellite enabled device.
    Type: Grant
    Filed: June 5, 2009
    Date of Patent: November 8, 2011
    Assignee: Skyhook Wireless, Inc.
    Inventor: Farshid Alizadeh-Shabdiz
  • Patent number: 8031657
    Abstract: A location beacon database and server, method of building location beacon database, and location based service using same. Wi-Fi access points are located in a target geographical area to build a reference database of locations of Wi-Fi access points. At least one vehicle is deployed including at least one scanning device having a GPS device and a Wi-Fi radio device and including a Wi-Fi antenna system. The target area is traversed in a programmatic route to reduce arterial bias. The programmatic route includes substantially all drivable streets in the target geographical area and solves an Eulerian cycle problem of a graph represented by said drivable streets. While traversing the target area, Wi-Fi identity information and GPS location information is detected. The location information is used to reverse triangulate the position of the detected Wi-Fi access point; and the position of the detected access point is recorded in a reference database.
    Type: Grant
    Filed: August 13, 2008
    Date of Patent: October 4, 2011
    Assignee: Skyhook Wireless, Inc.
    Inventors: Russel Kipp Jones, Farshid Alizadeh-Shabdiz, Edward James Morgan, Michael George Shean
  • Publication number: 20110235532
    Abstract: Methods of and systems for resolving multiple location estimate conflicts in a WLAN-positioning system are provided. Disclosed are methods to quantify the probability that a particular location estimate of a mobile device made by a Wi-Fi based positioning system is correct to within an arbitrary accuracy. Implementations use observed access point cluster size, age information for access point location determination, and/or cumulative distribution functions that characterize the conditional probability that one or more access points detected by the mobile device have relocated within a specified time interval to make the probability determinations.
    Type: Application
    Filed: April 15, 2010
    Publication date: September 29, 2011
    Applicant: Skyhook Wireless, Inc.
    Inventors: Farshid Alizadeh-Shabdiz, Oleksiy Ignatyev