Multi-path error correction method and device under condition of antenna environment change

The invention relates to the technical field of GNSS (Global Navigation Satellite System) high-precision positioning algorithms, in particular to a multi-path error correction method and device under the condition of antenna environment change, and the method comprises the following steps: determining a multi-path error and observation noise according to a satellite-ground distance, an integer ambiguity parameter and a receiver carrier phase observation value; carrying out standardized grid division on the visual airspace of the observation station antenna; based on the divided standardized grids, averaging the multi-path error and the observation noise to obtain a multi-path error correction value corresponding to the grids; according to the carrier wave post-test residual error value corrected by the multipath error correction value, abnormal grids with abnormal post-test residual errors in the grids are screened out; and performing real-time estimation and correction on the multi-path error correction valu