Research On Dispenser Integrated Navigation Method Based On Ins/BD/Polarized-light

As an advanced and complex new multi-purpose aeronautical guidance weapon system,the standoff attack dispenser has been widely studied in the world since the 1990 s.High-precision navigation,precise guidance,stealth shape and modular design can improve the survivability and combat capability of the standoff dispenser system in the opposing air defense system.The high-precision navigation system provides powerful information support for precision strike and is an important part in the dispenser design and research process.This thesis adopts the integrated navigation platform composed of Strapdown Inertial Navigation System(SINS),Bei Dou Navigation Satellite System(BDS)and Polarized Light Navigation System to provide low cost,high reliability,real-time and all-weather high precision navigation information for the dispenser.Firstly,the development and research status of the integrated navigation system at home and abroad are investigated.,the advanteges and disadvanteges of the INS,BD and polarized light navigation system are pointed out,the integrated navigation system scheme is analyzed,the integrated navigation and correlation filtering techniques is researched.Then the coordinate system commonly used in the movement of the dispenser id defined and the transformation relationship is given.The six degree of freedom dynamic modle of the dispenser is established.The motion equation of the dispenser is simplified reasonably,and the plan trajectory and simulation analysis of the dispenser flight schme are designed according to the assumptions of longitudinal and lateral motion decoupling and transient equilibrium,which lays a foundation for the subsequent precision analysis of the navigation system.Afterwards the basic principle of the SINS and its arrange equations are introduced in detail.,the state error propagation function is derived,the simulation and analysis of the navigation error of the dispenser based on SINS are given.The results show that its navigation error diverges over time.To correct this deficiencies,two auxiliary navigation methods,BD and polarized light,are introduced.The BDS and its working principle are introduced in detail,and the position resolver based on least squares algorithm is given.The mechanism of polarized light navigation is analyzed,the polarized light is quantitativelt described,the atmospheric polarization model is established,the polarization angle and polarization degree measured by sensor are used to calculated the attitude angle od the dispenser,and the attitude angle error observation equation are deduced.Finally,according to the issues that it is difficult for a single navigation method to meet the performance requirements of the dispenser,the research on integrated navigation and filtering technology is carried out.Aiming at the two combinations of INS/BD and INS/polarized light,the general description of Kalman filter algorithm is given,the system state equation and measurement equation are derived,and numerical simulation and analysis are carried out.Because the integrated navigation methods above can not effectively estimate all the system states,the integrated navigation technology based on INS/BD/polarized light is studied.The INS is used as the reference system,and the navigation filter is designed based on the decentralized federal kalman filter.The numerical simulation and analysis of the integrated navigation system under five different working conditions are completed,whcih results shows that it has higher percison and can meet the actual navigation requirement of the dispenser.