Reliable Analysis And Modeling Of NAV Redundant Navigation System Based On Rhapsody

Unmanned aerial vehicles (UAV) will become an important strategic material for the 21st century battlefield. Military unmanned aerial vehicles will reshape the 21st century combat mode. Navigation system is an important part of UAV. It gives UAV posture, speed and location information. If the navigation system became failure, UAV would be useless like human lost his eyes. In order to guarantee the stable and reliable performance of UAV system, it has important research significance to study the reliability analysis of UAV navigation system.The thesis adopts Model Based System Engineering to designs a reliability analysis and verification platform for an unmanned aerial vehicle redundancy system with Rhapsody system modeling tool designs for the navigation system redundancy management and integrated navigation system architecture design. This thesis mainly completed the following research:The mathematical model of information fuzzy reliability of navigation system is designed base on the theory of fuzzy reliability. The inertial navigation system is taken as an example to carry out the experimental verification of its reliability model. The verification results show that the model can accurately reflect the reliability of the output parameters of the navigation system.The key technology of modeling technology is studied, and the SysML modeling specification of a UAV navigation system is designed, and the OXF framework design of the navigation system reliability simulation platform is completed.In the thesis, a redundancy management algorithm for fault mutual detection is developed. And the thesis presents an improved algorithm of redundancy algorithm,which proves that the improved redundancy algorithm is superior to the mean voting method.Finally, the thesis constructs the model of each subsystem of the navigation system according to the reliability verification requirement of the unmanned aerial vehicle navigation system. And the reliability verification platform of the redundant navigation system is developed. The platform, which established in the thesis, has reached the design requirements through the simulation test of the navigation system reliability analysis.Based on the model development method, this paper constructs the subsystem model of the unmanned aerial vehicle navigation system by using the graphical modeling language, and develops the navigation system reliability analysis platform.The flight control of the aircraft can analyze the reliability performance of the redundant navigation system with the platform, and greatly facilitates the reliability design of the navigation system.