滚仰式导引头斜置方案下的过顶奇异问题控制策略

In the terminal guidance stage, since the guidance target is located near the longitudinal axis of a projectile, the roll-pitch seeker is prone to singularity problems and it is difficult to accurately track the target. In view of the above problems, this paper studies the control strategy of zenith-pass singularity problem under the oblique scheme of roll-pitch seeker. On the basis of the pitch frame angle of the stabilized platform of seeker relative to the oblique boundary of projectile, this strategy ensures that the optical axis of seeker always avoids the zenith-pass singularity area by controlling the roll motion of projectile, and realizes the stable tracking of the two zenith-pass singularity areas near the longitudinal axis of projectile and the initial optical axis of oblique seeker. Compared with a method of adding a third axis, the proposed strategy can make the seeker have small volume and light weight. Compared with the sub-region variable parameter control strategy, the problem that the seeker fails to track the line-of-sight angular velocity in the zenith-pass singular region during static and deceleration control is solved. The simulated results show that the proposed strategy has the characteristics of high tracking accuracy, effectively suppressing the instability of control system and reducing the misalignment angle of detector.