Application Research On Guided Projectiles Of MEMS/Geomagnetic/Satellite Integrated Navigation Device

MEMS inertial navigation is currently the only inertial navigation system at home and abroad that is resistant to high overloads and adapts to high rotational speeds.Therefore,MEMS inertial navigation is a hot topic for inertial navigation research at home and abroad,and is also a core key technology for the development of guided artillery shells.In this paper,a combination navigation system based on MEMS,geomagnetism and satellites is proposed in the context of an actual scientific research project,and the application of this combination navigation system to the upper ammunition is thoroughly studied through theoretical analysis and simulation verification.Among others,the main contents of this paper are as follows.Firstly,the basic principles of inertial navigation system are summarized,firstly,the inertial components are modelled using the first-order Markov process based method,and the simulation results show that the built model is relatively accurate;then the simulation comparison of three commonly used attitude solving algorithms for solving accuracy is carried out,and the simulation results show that the equivalent rotation vector method is more accurate,so the equivalent rotation vector method is chosen as the system attitude update algorithm;secondly,by The simulation results show that although the short-term navigation accuracy of the single inertial navigation system is higher,as time grows,the system gradually diverges and the navigation accuracy becomes worse,so the inertial navigation system cannot navigate with high accuracy for a long time.Secondly,on the basis of inertial navigation system,the characteristics of satellite positioning navigation and geomagnetic navigation are integrated,and the fusion algorithm of inertial navigation,geomagnetic navigation and satellite navigation is designed,the state quantity and observation quantity are selected,and the combined navigation mathematical model is established.The simulation module is built in MATLAB/Simulink environment,and by comparing the navigation parameters obtained from the simulation,the simulation results show that the combined navigation can reduce the output error of the guided projectile and improve the navigation accuracy when compared with the single inertial navigation system.Finally,in order to further verify the feasibility and practicality of the combined MEMS/geomagnetic/satellite based navigation system.Taking the aerodynamic and structural parameters of a guided artillery shell as the background,the test scheme and process are designed to set the error parameters and binding parameters of the system;then the semiphysical simulation of the combined navigation system is carried out by the experimental device,and the experimental results show that the output of the combined navigation system is consistent with the parameter variation of the simulated value,with a maximum standard deviation of 2.6° in attitude angle error.It is demonstrated that the combined MEMS/geomagnetic/satellite based navigation system can achieve the navigation requirements of guided artillery shells.The combined MEMS,geomagnetic and satellite navigation system proposed in this paper can effectively estimate the navigation information of guided artillery shells,reduce the output error and achieve the purpose of improving the navigation accuracy,and the conclusions obtained are of guidance value for practical engineering applications.