All-weather star sensor optical system

Abstract

The invention relates to a star sensor optical system, in particular to an all-weather ultra-large diameter broad-spectrum star sensor optical system. The optical system adopts a coaxial three-reflector structure form and comprises a first positive reflector, a second negative reflector, a third planar reflector and a fourth positive reflector, wherein the axis centers of the first positive reflector, the second negative reflector, the third planar reflector and the fourth positive reflector are sequentially arranged on the same straight line, and a diaphragm is arranged on the first positive reflector. The all-weather star sensor optical system resolves two technical problems of an existing star sensor optical system. One is that the existing star sensor optical system can be only used for measuring the outer space and can not achieve all-weather measurement. The other is that the existing star sensor optical system is small in caliber, the detectable limited magnitude is low, and the second-stage optical spectrum is large. The all-weather star sensor optical system is favorable for all-weather use of a star sensor, the caliber of the star sensor optical system is increased, the influence on the imaging quality of the optical system from color difference is avoided, and all-weather star sensor optical system is high in one-time detection probability and observable star magnitude.

Description

technical field [0001] The invention belongs to the field of optical design, and relates to a star sensor optical system using stars as a reference system for navigation, in particular to an all-weather star sensor optical system. Background technique [0002] After the light emitted by the star passes through the hood to remove most of the stray light, it is imaged on the detector plane through the lens, and the star image is photoelectrically sampled by the planar array detector to form a digital star map, which is then sent to the microprocessor. From the star map, the position coordinates of the star image on the detector plane and the position vector in the star sensor coordinate system are obtained through star point extraction; after extracting the position coordinates of several star points in the star map, the extracted star points are obtained through star map identification. The coordinates in the celestial inertial system can be used to obtain its position vector...

AI Technical Summary

Problems solved by technology

[0006] (2) There needs to be a compromise between the selection of the relative aperture, the size of the field of view, and the probability of detection at one time, and the selection of the number of observed magnitudes in the field of view must be taken into consideration;

[0008] At present, the star sensor optical system published in China is "Design of light and small star sensor optical system" published in "Acta Photonica Sinica" in 2004 and "Optical "System Design" uses transmissive and catadioptric optical structure types respectively, both of which are used in outer space space equipment such as satellites, and have the defect that they cannot be applied to all-weather star sensors in the atmosphere

The star sensor optical system with the application number 200610170214.9, the application number 201110288663.4 and the application number 201210358933.9 is a transmissive system. Although they have their own characteristics in terms of field of view and relative aperture, they are all used in outer space aerospace equipment such as satellites. Among them, there are defects that cannot be applied to the all-weather star sensor in the atmosphere

[0009] The increase of the aperture of the optical system directly affects the chromatic aberration of the optical system, which greatly increases the difficulty of correcting the aberration of the optical system

The diameter of the entrance pupil of the announced optical system is small, and the observable limit magnitude is limited

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