GPS elevation fitting method and fitting system based on SRTM1 and EGM2008

The invention discloses a GPS elevation fitting method based on SRTM1 and EGM2008, and the method comprises the following steps: S01, selecting s known points, solving the elevation anomaly of the s known points, and subtracting the elevation anomaly long wave term and the elevation anomaly short wave term of the known points from the elevation anomaly of the known points to obtain the elevation anomaly residual volume of the known points; s02, fitting the elevation anomaly residual quantities of the s known points to obtain a fitting model of the elevation anomaly residual quantities; and S03, resolving the elevation anomaly residual volume of the to-be-determined point based on the fitting model of the elevation anomaly residual volume, adding the elevation anomaly residual volume of the to-be-determined point to the elevation anomaly long-wave term and the elevation anomaly short-wave term of the to-be-determined point to obtain the elevation anomaly of the to-be-determined point, and subtracting the eleva