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Star sensor optical axis thermal drift evaluation method used in vacuum cryogenic environment

A technology of star sensor and evaluation method, which is applied in the field of optical instruments, can solve the problems such as large influence on modeling accuracy, and achieve the effects of improving measurement accuracy, strong practicability, strong field of view competitiveness and application prospects

Pending Publication Date: 2022-05-06
BEIJING INST OF CONTROL ENG
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  • Description
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  • Application Information

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Problems solved by technology

This analysis method can evaluate the level of thermal drift of the optical axis of the star sensor and can be used as a reference for engineering development, but the results are greatly affected by the accuracy of the modeling

Method used

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  • Star sensor optical axis thermal drift evaluation method used in vacuum cryogenic environment
  • Star sensor optical axis thermal drift evaluation method used in vacuum cryogenic environment
  • Star sensor optical axis thermal drift evaluation method used in vacuum cryogenic environment

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Embodiment Construction

[0056]The present invention will be further elaborated below in conjunction with embodiment.

[0057] Establish a set of external heat flow simulation system, such as figure 1 As shown, it includes vacuum equipment, heat sink, optical platform, liquid nitrogen device and star simulator, which are used for vacuum cryogenic background simulation, on-orbit heat flow simulation and product interface temperature level simulation;

[0058] Vacuum equipment provides deep-hole cryogenic environment simulation. The vacuum degree is generally 1.3×10-3Pa. The inner wall of the vacuum container is designed with a heat sink, which can be cooled by liquid nitrogen. The cooling temperature is generally required to be 100K; a stable optical platform is set inside the container. The plane stability of the upper surface is better than 0.2″ / °C.

[0059] Establish a stable star simulator in the vacuum chamber to simulate single star and multiple star functions. The working spectrum range: 250nm~...

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Abstract

The invention relates to a star sensor optical axis thermal drift evaluation method used in a vacuum cryogenic environment, and belongs to the technical field of optical instruments. The method comprises the following steps: installing a tested product in an external heat flow simulation system, and carrying out external heat flow simulation implementation on a tested star sensor according to a space external heat flow condition needing to be simulated; starting the star sensor, realizing simulation of external heat flow under different working conditions by controlling the working condition parameter setting of the external heat flow simulation system, and simultaneously collecting four elements of the attitude of the star sensor under different working conditions; k-order polynomial fitting is carried out on the attitude quaternion of the tested product collected in the testing process, and the k-order polynomial fitting is used as a theoretical value of the attitude quaternion; and carrying out cross multiplication on the attitude quaternion of each sampling point and the fitted attitude quaternion, and calculating an error quaternion. The optical axis thermal drift index evaluation problem of the star sensor in the ground environment is solved.

Description

technical field [0001] The invention relates to a method for evaluating the optical axis thermal drift of a star sensor in a vacuum cryogenic environment, belonging to the technical field of optical instruments. Background technique [0002] Star sensors are essential space measurement sensors in high-resolution earth observation and astronomical observation missions. With the continuous improvement of platform requirements, the demand for star sensor measurement accuracy is also getting higher and higher. Among them, the star sensor with an accuracy of 0.3″ is an extremely high-precision star sensor at the world's advanced level. [0003] The accuracy evaluation and testing technology of the star sensor in the ground environment is the core capability to verify the level of product realization. In the error source evaluation, the low-frequency error of the 0.3″ star sensor is mainly determined by the degree of thermal drift of the optical axis in the orbital environment. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C25/00G01C21/02G06F17/00
CPCG01C25/00G01C21/02G06F17/00
Inventor 武延鹏王晓燕郑然祝浩隋杰余成武钟俊张承钰
Owner BEIJING INST OF CONTROL ENG
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