Trajectory correcting method of fixed-canard dual-spin projectiles based on period average

A trajectory correcting scheme in which the value of the average control force can be regulated is made for a fixed-canard dual-spin projectile which is spin-stabilized. Hereby the guidance and control system of the projectiles is devised. Based on the high-speed rotation characteristic of fixed-canard dual-spin projectiles, the angular motion equation is simplified, and the angular motion is analyzed. Then the relation between the resultant normal force and the deflection angle of canards is obtained. Afterwards, a trajectory correcting method, whose trajectory correction component rote in diverse rotational speed or diverse amplitude to produce the average normal force whose value is controllable, is proposed based on the concept of period average. And the feasibility of the method is validated by 6-DOF ballistic simulation. The results indicate that, compared with the traditional method whose trajectory correction component is fixed, the new trajectory correcting method can continuously control the value and direction of the average normal force, thus the guidance and control of fixed-canard dual-spin projectiles is realized so as to eliminate the trajectory deviation and improve the precision.