Control Methods For Two-dimension Trajectory Correction Of The Rocket Projectile Based On Fixed Canard

Control methods for two-dimension trajectory correction of the rocket projectilebased on fixed canard are researched in the paper. Fixed canard, which is one of thetwo-dimensional trajectory correction fuze optimization approach, has small volume,low cost, simple structure and other advantage. The deflection angle is fixed so thatthe control force can not be arbitrarily changed, can only by changing the roll angle ofthe fixed canard to correct the trajectory, and yet do not have the attitude stabilitycontrol loop in the control model. Therefore, the solution we select can control andcorrect the rocket projectile on the condition of rocket projectile flight stability. Thefixed canard also has asked for trajectory correction ability, thus put forward higherrequest for correct control methods. At home and abroad, it is not seen on theapplication of fixed canard on the rocket projectile. This paper focuses on the analysisof the feasibility of fixed canard applied on rocket projectile.Rigid body trajectory model based on fixed canard is established by which all theaerodynamic force, torque, moment and trajectory can be calculated in the freedomand control. In order to ensure the stability of the projectile with the canard force,through numerical simulation, considering the influence of Magnus force and torque,the projectile flight control stability is analyzed and calculated. The results show thatduring the flight, the projectile is able to maintain static stability and dynamic stability.A large number of numerical simulations are used to analyze the correction abilityunder the operating force and the relationship between the roll angle and the correctdirection angle, which laid the foundation for the correction control method. Then aneasily implement correction control method is proposed, which can control andcorrect the trajectory without the attitude sensor and meteorological determined butthe positioning data of the satellite receiver.At last, by the Monte Carlo method, the results simulation showed that using themethod can correct the projectile impact deviation caused by random disturbanceerror and effectively improve the impact intensity of the projectile.