Research On Simulation Technology Of Airborne Radio Interface Unit

In the researching process of avionics, it often happens that the development of some avionics lack of collaborative support of other avionic devices or system. At this time, there is a need to develop avionics simulation system to simulate the real avionics or system operating environment. Traditional R & D of avionics simulation system is to develop proprietary simulation software based on the specific simulation needs. This makes that the simulation software need to be changed largely or to redesign while the simulation devices or demand changes, so that the reusability and maintainability of the simulation software is poor.Therefore, it has important practical significance that researching the avionics simulation technology and developing an avionics simulation platform which has certain versatility and maintainability.RIU is the data control center of communications navigation system which is on the new generation domestic aircraft. In this paper, avionics simulation technology is studied deeply based on the simulation of RIU. RIU semi-physical simulation system which has certain extensibility and configurability is designed with hierarchical, modular and object-oriented conception. The system can be partly used as a versatile avionics simulation system development platform. Firstly, the interface property models and the function models are established, and the overall framework of RIU semi-physical simulation system is designed.The system is divided into functional simulation subsystem and integrated monitoring subsystem, so that the functional simulation and bus monitor can operate simultaneously, and the operational efficiency of the simulation system is improved. Thereafter, the hierarchical design and modular design of the two subsystems are given. The functional simulation system is divided into transport layer, buffer layer and functional application layer. Because the buffer layer shields the details of the underlying physical data transmission and can provide unified data access interfaces to the functional application layer, the functional simulation system can be used as a versatile development platform for avionics simulator. R & D personnel only need to develop the functional application layer in the development of similar avionics simulator, so the repetitive work is reduced largely. Then, the detailed design and implementation of the simulation system is given in Visual Studio 2008 development environment, using the object-oriented conception, the MFC library and the C++ language.Finally, RIU semi-physical simulation system is tested in the flight environment simulator based on QAR data, and the expected functionality has been verified.