| The avionics system is an important part of unmanned aerial vehicle (UAV). Theperformance of avionics system will directly affect the operation performance andreliability of UAV. The simulation and testing of avionics system is not only animportant part of the design of modern avionics system, but also the main means toensure the system performance and reliability. The flight simulation of UAV is animportant functional unit, which can support the simulation of avionics system. So it hasimportant value for assisting the design and testing of avionics system. According to theactual needs of a UAV avionics simulation system, this dissertation has designed theoverall scheme of flight simulation system. Focusing on the multi-mode control logicmodule, after a detailed analysis and design, the simulation model is created, optimizedand verified. Specifically, this dissertation has mainly studied the following aspects:Firstly, the overall scheme of flight simulation system has been designed. Byanalyzing the hardware and software platform of avionics simulation system, the needsanalysis of flight simulation system is carried out. According to the modular designconcept, the overall scheme is designed to divide different function modules. On thisbasis, the needs of multi-mode control logic module are analyzed in detail from thethree levels of tasks, functions and system. Furthermore the overall design is realized.Secondly, the detailed design and simulation of multi-mode control logic has beenrealized. Based on Matlab/Stateflow modeling tools, according to the hierarchical andmodular design method, the overall structure of simulation model is designed, and themaintainability and expansibility of the structure are realized. Then, the key controllogic is analyzed and studied. For the autonomous navigation flight, both longitudinaland lateral control logic are designed in detail, and then the simulation model is created.Thirdly, the optimization design of simulation model has been realized. For theproblem of control instruction jump that due to the switching of different UAV flightmodes, the related smoothing algorithms are studied. And respectively based on onedimensional interpolation and inertia link, the instruction smoothing algorithms aredesigned. After the simulation, it shows that the control instruction has realized smooth transition, and the output response is more ideal, which can meet the desired effect.Lastly, the simulation model has been tested and verified. The man-machineinterface is created by using Matlab/GUI technology. Combining multi-mode controllaw module and the UAV dynamics model, the comprehensive test platform of the UAVflight simulation has been developed to verify the correctness of multi-mode controllogic. The simulation model is able to meet the functional requirements of the UAVflight simulation, and it also provides strong support for the avionics simulation system. |
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