Dummy Topography Projection and the Aggregation of the Results in the Earth Synchronous Satellite Positioning System

According to the Earth synchronous satellite positioning principle, multi-results and non-results are analyzed when the station height is given using DEM. By observation equations, the criterions of judging multi-results and non-results are obtained. Introducing the method of dummy topography projection, the subclass π_2 of positioning results belong to sub-steady convergence is gained.