光纤图像制导导弹导引头框架角分析
林德福, 姚怀瑾, 陈方正
北京理工大学宇航学院, 北京 100081
Frame angle design of image guided aircraft
LIN Defu, YAO Huaijin, CHEN Fangzheng
School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
摘要 光纤图像制导导弹导引头采取小型化结构,为避免导引过程中发生碰框,需要对导引头框架角进行约束。研究了图像制导导弹在三点法和比例导引法下的需用框架角。结果表明,三点法导引随弹目距离接近需用框架角增大,比例导引法使框架角收敛,由此提出极限框架角时刻,即三点法导引转入比例导引的瞬间。讨论了目标机动对框架角的需求,目标曲线逃逸情况下,单纯的比例导引可能导致追踪过程中导弹框架角发散,由此设计了带有框架角约束的比例导引律。仿真结果表明,加入框架角约束项,能够较为有效地将框架角限制在一个相对较小的波动范围,实现框架角的约束,适用于追踪曲线运动目标。
关键词 :
框架角 ,
目标机动 ,
导引律
Abstract :In the design of the image guided bomb, the frame angle varies in a limited range in order to avoid hitting the frame of the miniaturization seeker. Therefore the guidance with a limited frame angle range of the image guided aircraft should be studied. The frame angle increases with the decrease of the line-of-sight distance in the three-point guidance, but it is the other way round using the proportional guidance. Therefore, the maximum frame angle is reached when changing the guidance law from the three-point guidance to the proportional guidance. In this paper, a modified proportional navigation is put forward to decrease the frame angle when following a curve escaping target. The frame angle can thus be limited in a small range according to the simulation results.
Key words :
frame angle
target maneuver
guidance law
收稿日期: 2014-08-23
作者简介 : 林德福,教授,研究方向为飞行器总体,电子信箱:lindf@bit.edu.cn;姚怀瑾,硕士研究生,研究方向为飞行器制导与控制技术,电子信箱:jin_remember@163.com
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