A Star Sensor Shade Based on Spatial Filtering

Abstract

The invention discloses a space filtering based light shield of a star sensor. The light shield comprises a cover casing and first to sixth shading rings, and the first to sixth shading rings are arranged from an entrance pupil position to the exit pupil position sequentially and mounted in the cover casing; the first shading ring and the sixth shading ring are arranged at the two ends of the cover casing opposite to each other, and a connecting line between cutting edges of the first shading ring and the sixth shading ring and a center line of the cover casing form an included angle of 16 degree; and the middle portions of the fourth, fifth and sixth shading rings are provided with optical filters in a rotational installation manner respectively. The light shield has the advantages that the cover casing, the shading rings and the optical filters form an optical-mechanical assembly of the light shield, and it is ensured that the star sensor can output effective attitude data when a sun shielding angle is greater than 20 degree; a non-imaging spectrum of the sun shielding angle greater than 20 degree can reach the entrance pupil position of an optical system via at least twice absorptive scattering; and the light shield has a high light shielding performance, and is capable of spectrum filtering.

Description

technical field [0001] The invention relates to the technical field of aerospace starry space detection, in particular to a star sensor light shield based on space filtering, which can realize the elimination of stray light interference by the star sensor at a sun protection angle of not less than 20°. Background technique [0002] Stray light suppression technology is one of the key technologies of star sensors, and the hood is the most effective measure to suppress stray light. Effective suppression within a certain design protection angle range. [0003] The design idea of ​​the optical structure based on the spatial filtering hood is: 1. Based on the spatial filtering mechanism, avoid the non-working spectrum from entering the imaging device of the star sensor; 2. Make the stray scattered light incident on the entrance pupil of the optical lens of the star sensor After at least two times of scattering, the purpose is to attenuate the incident stray scattered light energ...

AI Technical Summary

Problems solved by technology

[0004] Satisfying the above conditions, the optical structure design of the star sensor hood and light blocking ring can achieve the maximum attenuation of stray scattered light from the optical point of view. At present, there is no star sensor hood with the above technical characteristics in the industry, so relevant Products, realize star sensor to eliminate the interference of stray scattered light at the sun protection angle

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