Study on GPS/DR/MM integrated navigation system for vehicle based on DSP

Recent developments of the second-generation automotive navigation systems have posed more restrictive requirements for vehicle positioning accuracy. Only after accurate current vehicle locations are available can appropriate maneuver instructions be generated from the route guidance algorithm. Dead-reckoning (DR) systems and GPS are two commonly used techniques for vehicle navigation systems. While both methods suffer from different drawbacks, superior performance can be obtained by combining these two techniques. In this paper, a kind of integrated GPS/DR/MM system based on DSP with continuous positioning is developed and the operational principle of the system for vehicles is given. This system uses the GPS signals to adaptively calibrate the sensors of DR as well as to rescue the system from unexpected position errors. On the other hand, DR, through using a map-matching algorithm, provides feedback for calibrating the GPS position errors. Experimental results demonstrate the effectiveness of this integrated navigation system.