滚仰式红外导引头视线角速率提取方法研究

Research on Roll-pitch Infrared Seeker LOS Rate Extraction

由于滚仰式导引头的结构特殊性,制导控制系统需要的视线角速率信息是不能够直接测量得到的,因此提出了一种基于跟踪微分器的视线角速率提取方法。根据滚仰式导引头的结构特点,分析了滚仰式导引头的运动学原理,并根据滚仰式导引头的结构推导出视线角与弹体姿态角、框架角和失调角的关系,然后设计了有限时间收敛跟踪微分器求解视线角速率信息。经数字仿真,对比了直接差分法和跟踪微分器法对视线角速率的提取效果,证明了利用跟踪微分器提取视线角速率的有效性。

A new solution of LOS Rate Estimation based on tracking-differentiator was proposed in this paper because LOS Rate information couldn＇t be attained for the structure particularity of Roll-pitch Seeker. The k＇mematics was analyzed, also was the relationship between LOS angle and missile attitude angle, gimbal angle, misalignment angle according to the structure particularity of Roll-pitch Seeker. And then, a tracking differentiator was designed for LOS Rate Extraction. The simulation results show that the LOS Rate Extraction based on tracking-differentiator performs better than direct difference method, which proves that the LOS Rate Extraction based on tracking-differentiator is very effective.