Attitude capture method of star sensor under space particle interference condition

Abstract

The invention discloses an attitude capture method of a star sensor under the space particle interference condition. The method comprises steps as follows: when attitude capture of the star sensor is interfered by space particles, rolling strip type storage is performed on effective pixels read from an image surface of the star sensor, so that complete star map star point information is acquired; matching identification is performed by the aid of the star map star point information, position information of multiple frames of star points is compared when matching fails, the star points with larger deviations are rejected, and then matching identification is performed again; attitude calculation is performed by the aid of matching identification results, multiple frames of attitude capture results are compared and verified, and attitude capture is judged to be successful when deviations between the results meet requirements. According to the method, comparison and screening are performed according to multiple frames of complete star point position information, pseudo star points caused by space particle interference can be accurately distinguished, and the correctness of attitude capture of the star sensor in the space environment can be guaranteed.

Description

technical field [0001] The invention belongs to the field of star sensors for space vehicles, and relates to an attitude capture method for star sensors under the interference condition of space particles. Background technique [0002] The star sensor is an imaging space attitude measurement sensor. By extracting, identifying and calculating the star points of the captured star map, the three-axis attitude information of the star sensor is output. Due to its high precision and high reliability, it can , are widely used in various spacecraft such as satellites and spaceships. The new generation of star sensors mostly use the effective pixel buffer method instead of the full image buffer method to obtain star point information. However, when it is applied in space, it may be interfered by space particle radiation, and the sensitive image surface of the star sensor will show more pseudo star pixels, which will cause the effective pixel buffer of the star sensor to overflow, an...

AI Technical Summary

Problems solved by technology

However, when it is applied in space, it may be interfered by space particle radiation, and the sensitive image surface of the star sensor will show more pseudo star pixels, which will cause the effective pixel buffer of the star sensor to overflow, and the attitude capture cannot be completed normally. The attitude capture of star sensors under the condition of space particle interference is an important way to improve the space reliability of star sensors

[0003] Existing methods for star sensors to suppress similar interferences, such as "A Fast Star Point Extraction Method for Star Sensors" (Authors: Li Yufeng, Li Guangze, etc.; Source: Journal of Instrumentation), "Navigation Star Map Preprocessing and Matching Recognition Technical Research" (Author: Zhao Zhen; Source: National University of Defense Technology Master's Degree Thesis) and other documents, mostly based on the improvement of star map matching recognition methods or pseudo-star point discrimination methods during attitude capture, these methods can be used to a certain extent However, it usually cannot solve the problem of star sensor pixel buffer overflow caused by space particle interference. In areas with severe particle interference (such as SAA), it is impossible to obtain the star point information of the full star map, which is not conducive to Normal completion of sensor pose capture

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