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Star sensor hood and its design method

Technology of a star sensor, design method

Active Publication Date: 2018-12-18
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The star sensor is easily affected by stray light in practical applications, resulting in a decrease in imaging quality and imaging contrast, which affects the subsequent star point extraction and star image processing. In severe cases, the system will not work properly, so stray light is suppressed Very important for the proper functioning of the star sensor

Method used

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  • Star sensor hood and its design method
  • Star sensor hood and its design method

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Embodiment Construction

[0032] figure 1 It is a dimensional design drawing of a light shield proposed by an embodiment of the present invention. according to figure 1 The geometric relationship in can list equations to calculate the length L of the hood, the length L1 of the primary hood, the length L2 of the secondary hood and the diameter d2 of the upper port of the hood.

[0033] Depend on figure 1 The geometric relationship in can be listed as the following formula:

[0034] d 2 = d 1 +2Ltanω

[0035] L=L 1 +L 2

[0036] ΔMNP

[0037] ΔMPQ

[0038] L 2 =MNcosω

[0039] L 1 =MQsin(90°-θ)

[0040] Combining the above formulas, for a given sun suppression angle θ, CCD field of view ω and entrance pupil diameter d1, the length L of the hood, the length L1 of the primary hood, the length L2 of the secondary hood and the length of the hood can be calculated. Diameter d2 of the upper port. Then the shading mask that determines the structural parameters is extended as figure 2 struc...

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Abstract

The invention discloses a star sensor hood and a design method thereof.The method includes: calculating the length a and the upper port diameter d2 of the hood according to the known sun inhibition angle theta, CCD field angle omega and entrance pupil diameter d1, and symmetrically expanding two ends of an upper port to expand the hood into a cylindrical structure, wherein the bottom diameter of the cylindrical structure is equal to the diameter of the expanded upper port; designing a plurality of transverse light blocking rings and a plurality of vertical light blocking rings in the cylindrical structure; or designing a honeycomb structure and a plurality of vertical light blocking rings in the cylindrical structure.The star sensor hood is high in stray-light inhibition ability.

Description

technical field [0001] The invention relates to the field of stray light suppression for optical-mechanical systems, in particular to a design method for a star sensor shading cover and the star sensor shading cover. Background technique [0002] The star sensor is easily affected by stray light in practical applications, resulting in a decrease in imaging quality and imaging contrast, which affects the subsequent star point extraction and star image processing. In severe cases, the system will not work properly, so stray light is suppressed It is very important for the normal operation of the star sensor. The star sensor hood can effectively suppress the stray light of the star sensor, and can ensure a good image quality. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a star sensor shading design method and a star sensor shading cover for the deficiencies of the prior art. [0004] In order to solve the above...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C21/02
CPCG01C21/025
Inventor 赵超伏思华王省书谈潇麟
Owner NAT UNIV OF DEFENSE TECH
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