Patents by Inventor Lingji Chen

Lingji Chen 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: 11555910
    Abstract: A technique for tracking objects includes: determining a set of detected measurements based on a received return signal; determining a group that includes a set of group measurements and a set of group tracks; creating a merged factor, including a merged set of track state hypotheses associated with a merged set of existing tracks including a first set of existing tracks and a second set of existing tracks, by calculating the cross-product of a first set of previous track state hypotheses and a second set of previous track state hypotheses; determining a first new factor and a second new factor; calculating a first set of new track state hypotheses for the first new factor based on a first subset of the group measurements; and calculating a second set of new track state hypotheses for the second new factor based on a second subset of the group measurements.
    Type: Grant
    Filed: July 29, 2020
    Date of Patent: January 17, 2023
    Assignee: Motional AD LLC
    Inventor: Lingji Chen
  • Publication number: 20220374734
    Abstract: The present disclosure includes systems, methods, and computer-readable storage media facilitating multi-target tracking with dependent likelihood structures. To facilitate tracking, sensor data associated with an environment that a vehicle is located in may be received. A set of candidate hypotheses may be obtained based on the sensor data. Each candidate hypothesis in the set of candidate hypotheses may include track and measurement information representative of candidate locations for one or more targets. The set of candidate hypotheses are evaluated against at least one criterion. A ranked set of hypotheses are determined based on the evaluation of the set of candidate hypothesis against the at least one criterion. The ranked set of hypotheses may include a subset of hypotheses selected from among the set of candidate hypotheses and may be used to estimate a location of each of the one or more targets.
    Type: Application
    Filed: May 19, 2021
    Publication date: November 24, 2022
    Inventor: Lingji CHEN
  • Publication number: 20210033720
    Abstract: A technique for tracking objects includes: determining a set of detected measurements based on a received return signal; determining a group that includes a set of group measurements and a set of group tracks; creating a merged factor, including a merged set of track state hypotheses associated with a merged set of existing tracks including a first set of existing tracks and a second set of existing tracks, by calculating the cross-product of a first set of previous track state hypotheses and a second set of previous track state hypotheses; determining a first new factor and a second new factor; calculating a first set of new track state hypotheses for the first new factor based on a first subset of the group measurements; and calculating a second set of new track state hypotheses for the second new factor based on a second subset of the group measurements.
    Type: Application
    Filed: July 29, 2020
    Publication date: February 4, 2021
    Applicant: MOTIONAL AD LLC
    Inventor: Lingji CHEN
  • Patent number: 10277247
    Abstract: A receiver includes: a filter circuit to generate predicted measurements for a set of tracks based on previous kinematic states of the tracks and timing and source data of next compressed measurements associated to the tracks, generate probability data of differences between the predicted measurements and next measurement data, generate the next measurement data using the predicted measurements and quantized differences between the predicted measurements and the next measurement data, and generate next kinematic states of the tracks based on the previous kinematic states, the timing and source data of the next compressed measurements, and the generated measurement data; a quantizer circuit to quantize the probability data into quantization tables and look up the quantized differences from corresponding indices in the quantization tables; and a decoder circuit to decode encoded index data of the next compressed measurements into the corresponding indices in the quantization tables using the quantized probabili
    Type: Grant
    Filed: April 11, 2018
    Date of Patent: April 30, 2019
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: Peter M. Kingston, Lingji Chen, Eric N. Duchon, Christopher D. Moss
  • Patent number: 10007852
    Abstract: Solutions for object tracking problems are presented by gathering images using one or more cameras, processing the gathered images to generate a directed acyclic graph, using the directed acyclic graph to determine a path cover that achieves maximum weight and satisfies one or more positive or negative constraints, and using the path cover to solve the object tracking problem. A first set of solutions utilizes trellis graphs, a second set of solutions employs a greedy approach, and a third set of solutions uses search algorithms.
    Type: Grant
    Filed: May 27, 2016
    Date of Patent: June 26, 2018
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: Lingji Chen, Balasubramaniam Ravichandran
  • Patent number: 9977123
    Abstract: A system and method for projecting target tracks produced by a remote tracker onto a surface of the Earth to obtain projected tracks is provided. Projection bias in a projected track from the remote tracker projected onto a planar map is removed by computing a discrete Frechet distance from a polygonal curve associated with a track derived from the remote tracker to a corresponding polygonal curve on the planar map. A correspondence between the projected track and a track on the planar map is automatically established. A projection bias is removed based on the correspondence.
    Type: Grant
    Filed: April 29, 2015
    Date of Patent: May 22, 2018
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: Lingji Chen, Balasubramaniam Ravichandran
  • Publication number: 20170213089
    Abstract: Solutions for object tracking problems are presented by gathering images using one or more cameras, processing the gathered images to generate a directed acyclic graph, using the directed acyclic graph to determine a path cover that achieves maximum weight and satisfies one or more positive or negative constraints, and using the path cover to solve the object tracking problem. A first set of solutions utilizes trellis graphs, a second set of solutions employs a greedy approach, and a third set of solutions uses search algorithms.
    Type: Application
    Filed: May 27, 2016
    Publication date: July 27, 2017
    Applicant: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: Lingji Chen, Balasubramaniam Ravichandran
  • Publication number: 20150338515
    Abstract: A system and method for projecting target tracks produced by a remote tracker onto a surface of the Earth to obtain projected tracks is provided. Projection bias in a projected track from the remote tracker projected onto a planar map is removed by computing a discrete Frechet distance from a polygonal curve associated with a track derived from the remote tracker to a corresponding polygonal curve on the planar map. A correspondence between the projected track and a track on the planar map is automatically established. A projection bias is removed based on the correspondence.
    Type: Application
    Filed: April 29, 2015
    Publication date: November 26, 2015
    Inventors: Lingji Chen, Balasubramaniam Ravichandran