A new fault detection and identification method for integrated navigation systems

Abstract

At present, integrated navigation systems are frequently used for the navigation in the space. Compared with single navigation, integrated navigation is improved in the functions, but the sensors in the system are more, the scale of the system is enlarged, and the probability of failure in the system is increased. Once the fault appears, the loss is more or less. So to ensure the liability of the system, some necessary effective steps are made for fault toleration. In other words, the fault toleration scheme is very important for high precision and liability of the navigation system. Fault detection and identification is the premise of fault toleration. Therefore a new integrated navigation system with a new fault detection and identification method called GPS(Global Positioning System)/3DR system is proposed in the paper. In terms of the characteristics and the most familiar fault types of navigation sensors, data of sensors at normal and fault are simulated in the paper. Based on the traditional navigation system, a new integrated navigation with a new fault detection and identification method is designed, and the system is verified by simulation. Finally by the comparison of the typical integrated navigation system and the new integrated navigation system, the conclusion that the new integrated navigation system is better than the typical one in three sides is achieved.