Research On Integrated Measurement Technology Of Missile Attitude

For the attitude measurement of missile,the low cost single attitude measurement system has the limitations of low accuracy,poor stability and low fault tolerance.Considering the advantages of high integration and mature technology of MIMU measurement system,the technology of MIMU/GPS integrated attitude measurement has been studied by many scholars.Although MIMU/GPS integrated attitude measurement system has the advantages of easy engineering realization,the control of GPS satellite navigation information lies in other countries,which makes our weapon system lack of information security.Based on the above problems,the MIMU/BDS/GM integrated system attitude measurement scheme is proposed to handle the application requirements of high-precision,stable and reliable measurement of missile attitude,BDS means the Bei Dou navigation satellite system,GM means the geomagnetism attitude measurement unit,and Kalman filtering technology is used to improve the attitude measurement accuracy of the integrated system.Firstly,the development status of MIMU/BDS/GM integrated attitude measurement system and summarizes the development trend are described;Secondly,taking the conventional missile as the research object,the attitude measurement coordinate system is introduced,the conversion relationship between the coordinate systems are deduced,which provides the theoretical basis for the observation of the filtering system;Next,according to the basic attitude measurement principle of each sub unit,the update algorithm of attitude angle,speed and position are deduced,the error model of each attitude measurement sub unit is established as reference to design sub filter system;Then filter of the combined attitude measurement system is designed,and the method of decentralized federal Kalman filtering is used to estimate the state error of the combined attitude measurement system;Finally,the Matlab numerical simulation software is used to filter the algorithm performs simulation experiments that designed combined attitude measurement system.The combined attitude measurement system filter in MATLAB numerical simulation software is builded,and perform simulation experiment on the combined attitude measurement system filter algorithm.The simulation results show that the attitude measurement error of the MIMU/BDS/GM combined attitude measurement system does not diverge and the attitude measurement accuracy is high.It is verified that the combined attitude measurement system and filtering method meet the application requirements of the attitude measurement of the projectile.