| With the advent of the information age,human beings have an increasingly strong demand for the use of space.Space-based space target detection technology will greatly improve the understanding of space.The core of space-based space target detection technology is high resolution and high efficiency.Therefore,the resolution and field of view range of the space camera are more and more demanding.However,during the imaging period of the space-based space target detection system,factors such as the movement of the satellite platform and the rotation of the space camera will change the optical axis of the space-based space target detection system,which will cause the image rotation that seriously reduce the resolution and reliability of the image.Therefore,the corresponding image rotation compensation system must be equipped.In this paper,the image rotation of space-based space target detection system was quantitatively analyzed,and the corresponding image rotation compensation mechanism was designed and analyzed.The main work includes the following aspects:1.Image rotation analysis of space-based space target detection system.The imaging coordinate system of the space-based space target detection system was established by the homogeneous coordinate transformation,and the image rotation mathematical model was established based on attitude dynamics.The image rotation of the space-based space target detection system was analyzed quantitatively through MATLAB which provides a basis for the design index of the image rotation compensation mechanism.2.Design of miniaturized image rotation compensation mechanism.In order to solve the disadvantages of the traditional image rotation compensation mechanism which has large size and weight,the miniaturized rotation compensation mechanism of the space-based space target detection system was researched.According to the image rotation analysis of the space-based space target detection system,the design index was proposed.Aiming at the size requirement of space-based space target detection system,the design scheme of image rotation compensation mechanism was proposed.And the materials and driving components of the image rotation compensation mechanism are selected,and the transmission mechanism was designed.3.Design of flexible unit for image rotation compensation mechanism.Aiming at the shortcomings of the traditional transmission mechanism,such as large errors and idle stroke,a new flexible unit was designed based on flexible hinges.The flexible unit has the advantages of simple structure and high reliability.The effects of various structural parameters on the flexible unit were analyzed,and the mathematical model of deformation of the flexible element was established and verified by finite element simulation.The design scheme of the flexible unit was proposed by using the deduced mathematical model.4.Simulation verification of image rotation compensation mechanism.The design of the image rotation compensation mechanism was completed based on the flexible unit design scheme and the performance of the drive mechanism.Through finite element simulation analysis,the mechanical performance of the image rotation compensation mechanism was evaluated.And the accuracy of the image rotation compensation mechanism was analyzed based on the imaging coordinate system of the space-based space target detection system.The research work in this paper has achieved the image rotation analysis and image rotation compensation methods of space optical system with wide FOV,and the usable range of flexible hinges was expanded.It provides new ideas for the design of miniaturized high-precision image rotation compensation mechanism. |
