Research On The Missile Hardware-in-the-loop Simulation System Based On Scilab/Linux RTAI

The rapid development of precision-guided weapons has put forward higher requirements for simulation technology,and it is hoped that a low bomb consumption and quick results will reduce the test cost.HILS combines the flexibility of digital simulation with the accuracy of physical simulation.With the advantages of high confidence,quick results,and low cost,it has been valued by more weapon producing countries.At present,most of the existing missile HILS platforms at home and abroad are based on commercial software development such as Matlab/Simulink.Its high price,special equipment and strict authorization limit the use of teachers and students in universities and small teams.Based on the open source software Scilab/Xcos and Linux RTAI,this paper conducts research on missile HILSS,and conducts HILS verification on the designed missile guidance and control system.The specific works are as follows:First,a ballistic model of the missile is established and purely digital simulation is performed.Reasonable assumptions and simplifications were made for the missile.A six-degree-of-freedom model of the missile was established by using Scilab/Xcos.The optimal guidance law with falling angle constraint under time-varying speed were derived and verified,and three-channel dual-loop guidance control system were designed.A digital simulation was carrried out.The simulation results show that the missile ballistic model established in this paper is correct.Secondly,the Linux RTAI real-time operating environment was built and tested for real-time and effectiveness.The Linux RTAI dual-core real-time solution is used to extend the real-time performance of the Linux system.The test results show that the real-time performance of the real-time operating environment is improved compared to other environments,which can meet the requirements of semi-physical simulation tests.The test model can be successfully converted into real-time and run correctly.Then,the driver and real-time interface module of VMIC under Linux RTAI are developed.Introduce the role of the work in the entire system;write the driver,including header files and main functions;write custom interface functions and custom calculation functions,and package them into a real-time interface module that can run in a real-time environment,The communication bridge between the test components and the simulation model was built.Finally,a HILS test and analysis was performed.Based on the above work,a HILS scheme for a certain thrust-free air-to-ground missile is provided,including information interaction,communication data specifications between nodes,and synchronization scheme between nodes.The results of HILS and pure digital simulations analyze the sources of errors and summarize the advantages and disadvantages of HILSS.In summary,this article studies the missile HILSS based on Scilab/Linux RTAI,which has the advantages of strong secondary development,open source code,and low cost.The simulation results show that the missile HILSS constructed in this paper can meet the real-time and reliability requirements of HILS tests,and provides a new platform for missile and rocket HILS tests.