Method of LOS Rate Extraction for Roll-Pitch Infrared Seekers
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摘要: 滚转摆动式导引头采用滚转摆动两轴极坐标控制形式，外框为滚动框，内框为摆动框，视场可覆盖整个前半球，具有结构简单、重量轻、体积小、成本低等特点，因此非常适用于近程红外防空导弹。本文讨论了滚摆式导引头与偏仰式导引头视线角速率存在的差异，阐述了滚摆式导引头视线角速度存在x轴分量的原因。并给出了半捷联式滚摆导引头角速率的获取方式，推导了其简化形式，分析了简化公式使用的条件。仿真结果表明，该简化公式具有较好的近似精度，具有一定的工程应用前景。Abstract: Roll-pitch seekers adopt the polar coordinate control form of rolling and pitching two axes. The outer frame is the rolling frame, the inner frame is the pitching frame, and the field of view can cover the entire front hemisphere. They have a simple structure, light weight, small volume, and low cost; therefore, they are very suitable for short-range infrared air defense missiles. This paper discusses the difference between the line-of-sight rates of roll–pitch seekers and pitch–yaw seekers and expounds the reason why roll–pitch seekers rotate around the x axis. The method of obtaining the line-of-sight rate of the roll–pitch seeker is given, the simplified form is deduced, and the conditions for using the simplified formula are analyzed. The simulation results show that the simplified formula has good approximation accuracy and certain engineering application prospects.
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Key words:
- roll-pitch seeker /
- pitch-yaw seeker /
- line of sight rate
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图 4 误差角与框架角、视线角和姿态角的关系
Figure 4. Relationship of frame angle, line of sight, yaw angle and error angle
图 5 误差角、俯仰角、框架角与时间的关系
Figure 5. Relationship between error angle/angle of pitch/pitch frame angle/yaw frame angle and time
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