Terminal positioning precision prediction method based on Beidou grid code and urban three-dimensional model

The invention provides a terminal positioning precision prediction method based on Beidou grid codes and a city three-dimensional model. The method comprises the steps of data collection and feature extraction; model training: substituting the feature sample set into training to obtain a regression model of positioning precision; city gridding: acquiring a Beidou two-dimensional grid position code, generating a regional grid, and further establishing a spatial index; grid sampling: uniformly collecting position data of sampling points and recording latitude and longitude coordinates of point locations; and precision prediction and grid assignment: calculating average horizontal and vertical positioning precision prediction values in each grid, and generating a positioning precision prediction grid. Compared with the prior art, the unified index of the global space unit is obtained through the Beidou grid code, the positioning precision prediction grid is constructed, the positioning precision change of any pl