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    GLOBAL POSITIONING SYSTEM BIAS DETECTION AND REDUCTION
    5.
    发明公开
    GLOBAL POSITIONING SYSTEM BIAS DETECTION AND REDUCTION 审中-公开

    公开(公告)号：US20240094411A1

    公开(公告)日：2024-03-21

    申请号：US17933895

    申请日：2022-09-21

    Applicant: GM Global Technology Operations LLC

    Inventor： Gui Chen ,  Shu Chen ,  Bo Yu ,  Joon Hwang ,  Carl P. Darukhanavala ,  Vivek Vijaya Kumar

    IPC: G01S19/39 ,  G01S19/40

    CPC classification number: G01S19/396 ,  G01S19/40

    Abstract: A global positioning system (GPS)-bias detection and reduction system including a GPS-bias model having GPS statistical data creating a database representing data collected from a vehicle group having thousands or multiple thousands of vehicles saved in a database. At least one newly collected vehicle GPS data point is compared to the GPS statistical data to reduce negative effects of GPS-bias and to update the vehicle GPS-bias correction based on a previous GPS-bias model. A selected road node and a segment of a roadway have a map matching performed using a nearest service from a collection location of the GPS statistical data. A GPS-bias is calculated using a look-up of the database. An estimated horizontal position error (EHPE) defining a quality indicator is applied to distinguish a good quality GPS statistical data from a poor quality GPS statistical data.

    SYSTEM FOR FUSING TWO OR MORE VERSIONS OF MAP DATA
    7.
    发明申请
    SYSTEM FOR FUSING TWO OR MORE VERSIONS OF MAP DATA 有权

    公开(公告)号：US20240385010A1

    公开(公告)日：2024-11-21

    申请号：US18318247

    申请日：2023-05-16

    Applicant: GM Global Technology Operations LLC

    Inventor： Gui Chen ,  Bo Yu ,  Shuqing Zeng ,  Fan Bai ,  Joon Hwang ,  Vivek Vijaya Kumar ,  Mason David Gemar ,  Carl P. Darukhanavala

    IPC: G01C21/00

    Abstract: A system for fusing two or more versions of map data together includes one or more central computers that receive road network data representing a road network for a predefined geofenced area. The central computers compute a plurality of points that are each positioned at a predetermined distance from one another. The central computers create a plurality of bounding boxes for the road network based on the plurality of points and create a set of closest matched map data points for each bounding box that is part of the road network by executing a map-matching registration algorithm to align the two or more versions of map data with one another. The central computers execute a maximum likelihood estimation algorithm to determine probability distribution parameters of the set of closest matched map data points compared to the ground truth map data.

    LANE LINE MAP CONSTRUCTION USING PROBABILITY DENSITY BITMAPS
    9.
    发明公开
    LANE LINE MAP CONSTRUCTION USING PROBABILITY DENSITY BITMAPS 审中-公开

    公开(公告)号：US20240068836A1

    公开(公告)日：2024-02-29

    申请号：US17821898

    申请日：2022-08-24

    Applicant: GM Global Technology Operations LLC

    Inventor： Bo Yu ,  Joon Hwang ,  Gui Chen ,  Carl P. Darukhanavala ,  Vivek Vijaya Kumar ,  Shu Chen ,  Donald K. Grimm ,  Fan Bai

    IPC: G01C21/00

    CPC classification number: G01C21/3822 ,  G01C21/3841 ,  G01C21/3878

    Abstract: A method includes receiving sensor data from a plurality of sensors of a plurality of vehicles. The sensor data includes vehicle GPS data and sensed lane line data of the roadway. The method further includes creating a plurality of multi-layer bitmaps for each of the plurality of vehicles using the sensor data, fusing the plurality of the multi-layer bitmaps of each of the plurality of vehicles to create a fused multi-layer bitmap, creating a plurality of multi-layer probability density bitmaps using the fused multi-layer bitmap, extracting lane line data from the plurality of multi-layer probability density bitmaps, and creating the high-definition (HD) map of the roadway using the multi-layer probability density bitmaps and the lane line data extracted from the plurality of multi-layer probability density bitmaps.

    Global positioning system bias detection and reduction
    10.
    发明授权
    Global positioning system bias detection and reduction 有权

    公开(公告)号：US12270918B2

    公开(公告)日：2025-04-08

    申请号：US17933895

    申请日：2022-09-21

    Applicant: GM Global Technology Operations LLC

    Inventor： Gui Chen ,  Shu Chen ,  Bo Yu ,  Joon Hwang ,  Carl P. Darukhanavala ,  Vivek Vijaya Kumar

    IPC: G01S19/39 ,  G01S19/40

    Abstract: A global positioning system (GPS)-bias detection and reduction system including a GPS-bias model having GPS statistical data creating a database representing data collected from a vehicle group having thousands or multiple thousands of vehicles saved in a database. At least one newly collected vehicle GPS data point is compared to the GPS statistical data to reduce negative effects of GPS-bias and to update the vehicle GPS-bias correction based on a previous GPS-bias model. A selected road node and a segment of a roadway have a map matching performed using a nearest service from a collection location of the GPS statistical data. A GPS-bias is calculated using a look-up of the database. An estimated horizontal position error (EHPE) defining a quality indicator is applied to distinguish a good quality GPS statistical data from a poor quality GPS statistical data.

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