GPS technics with DR/MM arithmetic and its application on automobile positioning

Traditional GPS positioning technics works unsteadily on the occasion of insufficient satellite signal, it can be modified and supplied by DR/MM arithmetic. The theory of DR/MM arithmetic, the structure of GPS positioning system, the element of user´s terminal and its software flow chart are described respectively, and the function of the entire system is introduced. Practice proves that DR/MM arithmetic can remedy GPS signal perfectly.