Design Of Vehicle GPS/BD-DR Intergrated Navigation System

With changes of the modern life and production ways, navigation technology is widely required in various fields. Nowadays, GPS has been widely used in four navigation systems. However it can’t be completely relied on for some specific applications due to its being controlled by America. Meanwhile, Beidou satellite navigation system that is independently developed and under control of our country, has come into practical use and covered the Asia-pacific region, it will be further improved for its coverage area and become the development trend in relative application areas. The satellite navigation has the advantages of high precision, all-weather and it can work independently. However, the existence of multipath and obstacles block can lead to the increase of errors. Furthermore, in the signal blind area the system even couldn’t realize positioning. Moreover, common satellite navigation receivers aren’t suitable for high-speed applications due to their limited data rate. On the other hand, although DR based on multi-sensor data fusion has the advantages of real-time and high precision, but it suffered accumulated errors during long time running. Satellite-DR integrated navigation, combined by satellite navigation system and DR navigation system, can make up each other’s shortages. Therefore, it has become the choice of many applications and a hotspot of research.In order to realize seamless navigation with high precision, high reliability, this paper studies the current navigation technologies and analyzes their shortages. According to the drawbacks of the present DR technology, a low-cost DR scheme that employs an inclinometer together with a single gyroscope and accelerometer is proposed. Taking advantages of the DR and satellite navigation, a satellite-DR integrated navigation system is designed and realized by combing software function and hardware structure to improve the navigation performance. In the design, GPS/BD double system receiver is selected to raise the visible ratio of satellites and improve the navigation precision to some extent. Compared with the traditional satellite navigation receiver, integrated navigation system completes data fusion using federal Kalman filter, and introduces interpolation scheme to increase the data rate in high speed application. The system can reach to the data rate of40Hz in this design.A large number of field testing and simulation results show that the integrated navigation system not only inhibits the drift of receiving signals and smooth the navigation trail, but also increases the data rate effectively and solves the error problem caused by ramp and lever installation. This navigation system can meet the basic requirements and achieve higher positioning precision in flexible mobile environment with ramps and signal blind areas. In general, it has achieved our design purpose to offer a charming solution for urban complex traffic and high-speed train navigation.