论文部分内容阅读
光学系统的大小决定着空间相机的体积重量及制造和发射成本,随着用户对分辨率等要求的不断提高,以及空间竞争的日益激烈,对轻小型长焦距空间光学系统的研究显得极为迫切。光学系统重量体积轻小和长焦距是一对矛盾的要求,一般来说,焦距越长,分辨率越高,但光学系统的口径、重量、体积也将越大,甚至于超出目前的运载能力.因此,如何合理地选择光学系统的参数,已成为设计和研制高性能空间相机的关键之一.探讨轻小型高分辨率空间遥感光学系统视场、焦距、口径等基本参数的选取,重点从基于调制传递函数的判据,给出确定光学系统口径的方法.指出口径参数完全由空间相机地面分辨率要求和轨道高度决定.作为例子,设计得到了适用于轻小型高分辨率空间遥相机的长焦距光学系统,它由三块同轴二次非球面反射镜组成,其光学长度不到焦距十分之一、性能接近理论极限。
The size of the optical system determines the volume weight of the space camera and the manufacturing and launch costs. With the continuous improvement of users’ requirements for resolution and the increasingly fierce competition in space, the research on the small and long-length optical system with long focal length is extremely urgent. Optical system weight and small size and long focal length is a contradictory requirement, in general, the longer the focal length, the higher the resolution, but the optical system caliber, weight, size will be larger, or even beyond the current carrying capacity Therefore, how to select the parameters of the optical system reasonably has become one of the keys to design and develop the high-performance space camera.Selecting the selection of the basic parameters such as the field of view, the focal length and the caliber of the remote sensing optical system in light and small high resolution, Based on the criterion of modulation transfer function, a method to determine the aperture of the optical system is given, and it is pointed out that the aperture parameter is completely determined by the spatial resolution of the camera and the height of the orbit. As an example, Long focal length optical system, which consists of three coaxial secondary aspheric mirror, the optical length of less than one tenth of the focal length, the performance close to the theoretical limit.