PROCESSING MODELS FOR VERY HIGH-ACCURACY GPS POSITIONING

This paper addresses two aspects of high accuracy GPS positioning: sin gle point positioning and real-time kinematic positioning. In both cas es, it is shown that use of the correct models significantly improves the quality of the resulting positions. In the first case, emphasis is placed on physical models, especially the satellite orbit, and in the second case, emphasis is placed on the stochastic model, i.e. underst anding the statistics of the GPS observables.