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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。
In order to solve the problem that the exposed spherical structure of the traditional photoelectric reconnaissance platform increases the radar cross section of the aircraft, a method of realizing double-mirror rotation around the pitch axis and the azimuth axis to realize high-angle scanning is proposed. The scanning mode has a small exposed size, Machine conformal design to ensure the aircraft stealth performance. Based on the theory of light reflection vector, the imaging characteristics of the scanning system are studied. The image rotation caused by the rotation of the birefringence mirror around the pitch axis and the azimuth axis is quantitatively analyzed. The relationship between the image rotation angle and the rotation of the double mirror Angle and direction, and as a theoretical basis for image rotation compensation, a bi-directional control method of eliminating image rotation by controlling the dechirping prism is proposed to realize the strict coordinated movement of the scanning mirror and the deconvolution mechanism. The imaging experiment is used to verify that the generated image rotation is eliminated, and the rms value of the racemization accuracy can be calculated to be less than 8 ’, which achieves higher precision optical image deletion.