立式三反离轴相机光机结构设计

中巴地球资源卫星立足于陆地资源领域，以中高分辨率光学遥感为主。04A星主载荷采用大视场、低畸变三反离轴式光学系统。为解决相机立式安装带来的力学环境恶劣问题，提出了一种箱式主承力结构与被动隔振的解决方法，从主承力结构设计、反射镜支撑、隔振措施入手，对三反离轴相机进行了静力学、动力学建模，优化结构形式，通过光机集成分析，提高了结构固有频率，一阶频率达到168 Hz，降低了发射段力学响应，相机关键部件力学响应衰减50%以上，相机系统传递函数大于0.18。经过地面环境试验和在轨验证，光机结构设计合理，力和隔振性能均满足使用要求。

Opto-mechanical structure design of vertical off-axis TMA system camera

China-Brazil Earth Resource Satellite is based on the field of land resources and mainly focuses on high and moderate resolution optical remote sensing. The main payload on the 04A satellite adopts off-axis TMA optical system with large field of view and low distortion. In order to solve the problem of harsh mechanical environment caused by vertical installation of the camera, a solution of box-type main structure and passive vibration isolation is proposed. We start with main frame design, mirror support and vibration isolation measures, the static and dynamic modeling of the off-axis TMA camera is carried out, and the structural form is optimized. Through the optical-mechanical integration analysis, the natural frequency of the structure is improved, the first-order frequency reaches 168 Hz, and the mechanical response of the transmitting section is reduced, the mechanical response of the key components of the camera is attenuated by more than 50%, and the transfer function of the camera system is greater than 0.18. The ground environment test and in-orbit test show that the optical mechanical structure design is reasonable, the mechanical and vibration isolation performance meet the use requirements.