This invention proposes a method and apparatus for maintaining a space target catalog
database by fusing post-hoc multi-source
observation data, belonging to the field of space situational awareness. The method includes: acquiring and preprocessing post-hoc
observation data of the observed space target; calculating observation arc segments using the preprocessed
observation data, using the obtained initial
orbit determination results as the orbital features of the observation arc segments, and then matching the observation arc segments with the orbital data of targets in the catalog
database, using the successfully matched observation arc segments as the associated arc segments of the target; fusing multiple associated arc segments of the target for precise
orbit determination, and updating and maintaining the catalog
database using the results of the precise
orbit determination. This invention can quickly preprocess the input multi-source observation data and complete the association matching between the data and space targets, and finally fuse the multi-source observation data for precise
orbit determination, ensuring computational efficiency and process integrity, and realizing the maintenance of the space target catalog database.