Sun Jianjun, Ding Yalin, Zhang Hongwen, Yuan Guoqin, Zheng Yuquan
Key Laboratory of Airborne Optical Imaging and Measurement, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Science, Changchun 130033, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Sensors (Basel). 2021 Sep 27;21(19):6441. doi: 10.3390/s21196441.
In order to enable the aerial photoelectric equipment to realize wide-area reconnaissance and target surveillance at the same time, a dual-band dynamic scan and stare imaging system is proposed in this paper. The imaging system performs scanning and pointing through a two-axis gimbal, compensating the image motion caused by the aircraft and gimbal angular velocity and the aircraft liner velocity using two two-axis fast steering mirrors (FSMs). The composition and working principle of the dynamic scan and stare imaging system, the detailed scheme of the two-axis FSM and the image motion compensation (IMC) algorithm are introduced. Both the structure and the mirror of the FSM adopt aluminum alloys, and the flexible support structure is designed based on four cross-axis flexural hinges. The Root-Mean-Square (RMS) error of the mirror reaches 15.8 nm and the total weight of the FSM assembly is 510 g. The IMC rate equations of the two-axis FSM are established based on the coordinate transformation method. The effectiveness of the FSM and IMC algorithm is verified by the dynamic imaging test in the laboratory and flight test.
为使航空光电设备能够同时实现广域侦察和目标监视，本文提出了一种双波段动态扫描与凝视成像系统。该成像系统通过两轴万向节进行扫描和指向，利用两块两轴快速反射镜（FSM）补偿由飞机和万向节角速度以及飞机线速度引起的像移。介绍了动态扫描与凝视成像系统的组成和工作原理、两轴FSM的详细方案以及像移补偿（IMC）算法。FSM的结构和反射镜均采用铝合金，基于四个交叉轴柔性铰链设计了柔性支撑结构。反射镜的均方根（RMS）误差达到15.8 nm，FSM组件的总重量为510 g。基于坐标变换方法建立了两轴FSM的IMC速率方程。通过实验室动态成像测试和飞行测试验证了FSM和IMC算法的有效性。
