为了解决传统光电侦察平台外露球形结构增大飞机雷达散射截面的问题,提出一种采取双反射镜绕俯仰轴和方位轴旋转实现大角度扫描的方法,该扫描方式的外露尺寸小,可与载机进行共形设计以保证飞机隐身性能。基于光反射矢量理论,对扫描系统成像特性进行了研究,对双反射镜绕俯仰轴和方位轴旋转所产生的像旋进行了定量分析,得出了像旋角大小和方向与双反射镜旋转角度和方向的确切关系,并以此作为像旋补偿的理论依据,提出一种通过控制消旋棱镜消除像旋的双向控制方法,实现扫描镜与消旋机构的严格协同运动。通过成像实验进行了验证,消除了所产生的像旋,计算可得消旋精度均方根值小于8',实现了较高精度光学消像旋。

To solve the problem that the traditional electric-optical reconnaissance platform which is the exposed spherical structure increases the radar cross section of airplane dramatically, we propose a method using double reflectors rotating along the pitch axis and the azimuth axis to achieve wide-angle scanning. The conformal design with aircraft can be realized because of the small exposed size of this structure, and the cloaking performance of the aircraft is ensured. Based on the light reflection vector theory, we firstly study the imaging characteristics of the scanning system, and quantitatively analyze image rotation induced by the two reflectors rotating along the pitch axis and azimuth axis. The exact relationship between the degree and direction of the image rotation angle and the rotation angle and direction of the two reflectors is concluded. According to the above image rotation compensation theory, a bilateral control technique to eliminate the image rotation is put forward when the image de-rotation prism is controlled, and exactly cooperative motion of the scanning mirror and the de-rotation structure can be realized. Finally, imaging experiments are carried out to validate the proposed technique, and the results indicate that the image rotation is eliminated after de-rotation and high-precision optical image despun with root mean square less than 8' is achieved.