新型红外导引头伺服控制方法的优化与研究

Optimization Study on Servo Control Method for Roll-Pitch Infrared Seeker

研究滚仰式两轴位标器光轴空间随动轨迹的优化问题。由于运行轨迹的不确定性引起超调较大,造成系统不稳定。目前俯仰/横滚两轴位标器光轴随动搜索过程中,传统的随动算法调整光轴运行轨迹的性能差,导致搜索图形随离轴角的变化产生畸变,以及随动搜索动态性能恶化问题。为解决上述问题,提出了一种利用四元数递推求解球面直线约束方程的分段搜索方法,以球面直线弧规范光轴的运动轨迹,解决了搜索图形的畸变问题。通过仿真分析,结果表明红外导引头使用改进方法可以实现前半球视场任意空间位置标准图形的目标搜索,且动态性能得到极大地改善。

A trajectory optimization method of optical axis was proposed for the roll - pitch seeker. Due to the large overshoot caused by the uncertainties of optical axis trajectory, the system will be instability. At present, in the servo - search process of the roll - pitch infrared seeker, the traditional servo algorithm is poor to adjust the optical axis motion trajectory, which causes the searching pattern to be distorted with the change of the off - axis angle. And also it leads to a deterioration of the dynamic performance of the servo - search. In order to resolve this problem, a segmented scan method was designed by recursively solving spherical arc line constraint equation based on quaternion. It solves the searching pattern distortion by using the spherical arc line constraint on the motion trajectory of the optical axis. Simulation results show that the infrared seeker can achieved the standard searching pattern at any position in the front hemisphere scene through the segmented scan method, and the dynamic performance is greatly improved.