Two-dimensional image motion compensation optical system for large-field-of-view whisk-broom double-channel imager

Abstract

The invention discloses a two-dimensional image motion compensation optical system for a large-field-of-view whisk-broom double-channel imager. The optical system comprises a forward image motion compensation mirror, an off-axis three-lens reflex afocal telescope, a second reflector, a transverse image motion compensation mirror, a third reflector, a color separation filter, a channel-1 imaging mirror group, a channel-1 image plane, a channel-2 imaging mirror group and a channel-2 image plane. The whole optical path is arranged approximately axisymmetrically by taking an optical axis as a symmetry axis, so that rotational inertia during whisk-broom of an aerial camera can be effectively reduced; the off-axis three-lens reflex design is adopted for the afocal telescope, so that center shading can be avoided, and the spatial resolution of the camera can be ensured; the telescope has a solid entrance pupil and a solid exit pupil, so that the two-dimensional image motion compensation mirrors can be placed. The optical system has the advantages of large field of view, large relative aperture, small rotational inertia of the optical path, compact structure, mature machining, mounting and debugging technologies and the like, and can be used for a high-resolution plane surface array whisk-broom aerial optical camera for a platform such as an unmanned aerial vehicle and an aircraft nacelle.

Description

Technical field: [0001] The invention belongs to the technical field of aerial photoelectric imaging, and relates to a high-resolution aerial optical camera applied to various aerial platforms such as drones and aircraft pods, in particular to an airborne large-screen camera with two-dimensional image motion compensation function. Scene array sweeps the optical system of a dual-channel imager. Background technique: [0002] The development of modern aerial photoelectric imaging technology requires aerial cameras to have the ability to acquire large-field-of-view and high-resolution images under the condition of high-altitude and high-speed flight. Traditional large-field-of-view aerial cameras usually use rotating pendulum mirrors or prism scanning methods, which not only have a slow scanning rate, but also are bulky, and cannot adapt to the installation requirements of modern aerial platforms such as modern drones and airborne photoelectric pods. At the same time, during t...

AI Technical Summary

Problems solved by technology

Traditional aerial cameras with a large field of view usually use rotating pendulum mirrors or prisms to scan, which not only has a slow scanning rate, but also is bulky, and cannot adapt to the installation requirements of modern aerial platforms such as modern drones and airborne photoelectric pods.

At the same time, during the imaging process of the aerial camera in high-speed motion, because the platform is in motion during the exposure time of the pixel, image motion will occur, resulting in blurred images and a serious drop in spatial resolution. These are all things that need to be considered in the design of the optical system of the new generation of aerial cameras. the elements of

[0003] AndrewJ.Partynski and StephenR.Beran of the U.S. published a dual-band reconnaissance camera in patents US6,694B2 and US6,374,047, which adopts the design scheme of area array swinging, but the camera optical system only has one-dimensional image motion. Compensation function, and due to the use of Cassegrain system, the optical modulation transfer function (MTF) is reduced, and the relative aperture of the camera is less than 1:4; Raytheon's DB-110 reconnaissance camera also adopts the plan of the area scan, the optical system Also for the Cassegrain system, the relative aperture is less than 1:5, and the smaller relative aperture and the central occlusion of the optical system will cause the camera system to weaken the ability to collect radiation signals and reduce the spatial resolution

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