Improved satellite ground trajectory intersection extraction method

The invention provides an improved satellite ground trajectory intersection point extraction method, which is used for preprocessing satellite height measurement data, and comprises the following steps of: extracting longitude, latitude, elevation and orbit number based on the satellite height measurement data, cutting the data according to a target area, and carrying out lifting orbit separation; track screening: before calculating the position of the intersection point, judging whether the intersection point exists in the rail lifting arc section and the rail descending arc section, and removing the arc section combination without the intersection point; performing curve fitting to solve the initial approximate position of the cross point; solving the accurate position of the cross point and interpolating the elevation of the cross point, namely determining an operation area of rapid rejection and straddling detection based on the initial approximate position, carrying out rapid rejection and straddling det