Patents by Inventor Kejun LIU

Kejun LIU 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).

  • Search and tracking method for full time-domain laser detection of space debris, storage medium, and electronic device
    Patent number: 12195209
    Abstract: In a search and tracking method for full time-domain laser detection of space debris, a set of latest precision orbital parameters of a debris object and start and end moments of a current transit of the object are first obtained. Search-specific guidance data is generated based on the above information and in combination with estimation of a maximum along-track error of the orbital parameters of the object during the current transit. A DLR system performs multi-elevation search on the object based on the search-specific guidance data, obtains a plurality of pieces of detection data of the object after detecting the object during the search, determines an along-track error of the orbital parameters of the object based on the detection data, and corrects the orbital parameters of the object in real time based on the along-track error, so as to guide the DLR system to subsequently track and detect the object.
    Type: Grant
    Filed: January 30, 2024
    Date of Patent: January 14, 2025
    Assignee: Purple Mountain Observatory, Chinese Academy of Sciences
    Inventors: Jin Xu, Zhibin Cao, Kejun Liu, Jianli Du, Jianbo Ma, Dong Yang
  • SEARCH AND TRACKING METHOD FOR FULL TIME-DOMAIN LASER DETECTION OF SPACE DEBRIS, STORAGE MEDIUM, AND ELECTRONIC DEVICE
    Publication number: 20240199241
    Abstract: In a search and tracking method for full time-domain laser detection of space debris, a set of latest precision orbital parameters of a debris object and start and end moments of a current transit of the object are first obtained. Search-specific guidance data is generated based on the above information and in combination with estimation of a maximum along-track error of the orbital parameters of the object during the current transit. A DLR system performs multi-elevation search on the object based on the search-specific guidance data, obtains a plurality of pieces of detection data of the object after detecting the object during the search, determines an along-track error of the orbital parameters of the object based on the detection data, and corrects the orbital parameters of the object in real time based on the along-track error, so as to guide the DLR system to subsequently track and detect the object.
    Type: Application
    Filed: January 30, 2024
    Publication date: June 20, 2024
    Applicant: Purple Mountain Observatory, Chinese Academy of Sciences
    Inventors: Jin XU, Zhibin CAO, Kejun LIU, Jianli DU, Jianbo MA, Dong YANG
  • METHOD FOR THE SYNTHESIS OF A TWO-DIMENSIONAL OR QUASI-TWO-DIMENSIONAL POLYMER FILM, THE TWO-DIMENSIONAL OR QUASI-TWO-DIMENSIONAL POLYMER FILM AND THE USE
    Publication number: 20220325053
    Abstract: The present invention relates to a method for the synthesis of a two-dimensional or quasi-two-dimensional polymer comprising a surfactant, the two-dimensional or quasi-two-dimensional polymer film and the use for the production of membranes, electronic devices or catalysts.
    Type: Application
    Filed: August 11, 2020
    Publication date: October 13, 2022
    Applicant: TECHNISCHE UNIVERSITÄT DRESDEN
    Inventors: Xinliang FENG, Renhao DONG, Kejun LIU