Sub-arc-second large-aperture compact optical structure for detecting dim point targets

Abstract

The invention discloses a sub-arc-second large-aperture compact optical structure for detecting dim point targets. The sub-arc-second large-aperture compact optical structure comprises a lens drum, as well as an optical system and an image surface which are arranged inside the lens drum, wherein the optical system comprises a first aperture correcting lens, a secondary reflector, a second aperture correcting lens, a first view field correcting lens, a second view field correcting lens and a main reflector; the axle centers of the first aperture correcting lens, the secondary reflector, the second aperture correcting lens, the first view field correcting lens, the second view field correcting lens and the main reflector are sequentially arranged in the same straight line; the secondary reflector is clung to the side surface of the first aperture correcting lens; the coverage range of the side surface of the first aperture correcting lens of the secondary reflector meets the imaging requirement; a circular hole is formed in the center of the main reflecting lens; the first view field correcting lens and the second view field correcting lens are arranged in the range limited by an opening of the circular hole; the image surface is arranged at the center of the side surface of the main reflector. The measurement accuracy of the sub-arc-second large-aperture compact optical structure is superior to the sub-arc-second grade; the optical aperture is equivalent to the total optical length; the structure is compact in structure and is suitable for detection of the dim point targets such as super-high-accuracy star sensors and space fragments.

Description

technical field [0001] The invention belongs to the technical field of optical design, and relates to an ultra-high-precision optical structure in a stellar positioning and attitude determination system using stars as a reference system for navigation and positioning or in a faint point-shaped space debris detection system, and in particular to a visual axis attitude accuracy It is superior to the optical structure in the satellite attitude control and measurement system or the space debris detection system with sub-arc second level and high degree of miniaturization. Background technique [0002] Star sensors are mainly used for high-precision attitude determination of satellites, spacecraft, space shuttles, and space stations. They can also be used for star guidance and control on rockets and missiles, as well as precise positioning and measurement of submarines and ships. Whether it is day or night, as long as the weather When it is clear and the star sensor is installed,...

AI Technical Summary

Problems solved by technology

However, due to the wide spectral range and large focal length of the weak point target, in order to correct the secondary spectrum, the length of the optical system will be longer, exceeding 200mm, and some even reach 350mm; and because the system has a large aperture, The number of lenses used is large (not less than seven), which leads to a large weight of the system; in addition, the refraction system is greatly affected by the temperature gradient, and the adaptability to the aerospace environment is poor

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