Research on Improved RAIM Algorithm Based on Parity Vector Method

It´s a realistic difficult problem about how to improve the positioning accuracy and the reliability of RAIM algorithms, on the situation that there are not enough available satellites. This dissertation puts forward RAIM algorithms with the elevation information in the areas as marine navigation. Through this method, the information redundancy can be increased. With only 3 satellites, we can realize positioning calculating. With 5 satellites, we can identify one-faulty satellite. With 6 satellites, we can identify simultaneous two-faulty satellites. According to the simulation analysis, this method can effectively improve the availability of fault detection of RAIM algorithms for one-faulty satellite and two-faulty satellites. In practice, it has profound guiding significance for the improvement of the positioning accuracy and the reliability of the receiver.