Error modeling and analysis of optomechanical platform based on multi-system theory

The quality of camera imaging is of great significance in aerial photography and space target detection, especially in the fields of military reconnaissance and geographic resource telemetry. There are many factors that affect the imaging quality of a camera mounted on the ground. One such factor is the optomechanical platform, as well as other related factors such as system control accuracy and optomechanical platform processing accuracy, where the optical axis pointing error is especially important for measuring the accuracy of a camera’s optomechanical platform. In this paper, to study the influence of the optical axis pointing error on the accuracy of the optomechanical platform, error traceability of a self-developed complex optomechanical platform is established, and based on the multi-body system theory, the spatial geometric error model of the platform and the mapping relationship between the optical axis pointing error and the geometric errors of the optomechanical platform are established. By analyzing the optical axis pointing error model, the influence of vertical axis errors of the pitch axis, azimuth axis, and rotation axis of the optomechanical platform on its optical axis is found. The results show that with the influence of the azimuth axis perpendicularity error, the pointing error decreases as the pitch angle increases, with the influence of the pitch axis perpendicularity error, the pointing error increases as the pitch angle increases, and with the influence of the rotation axis perpendicularity error, in the case of a smaller rotation angle, the pointing error increases as the pitch angle increases.