Star sensor artificial star screening method based on angular distance screening

Abstract

The invention discloses a star sensor artificial star screening method based on angular distance screening. The method comprises the following steps: (1) all star points in a first frame of a star mapare recorded as initial star points; (2) starting from a second frame, corresponding relations between each star point and the initial star points are established by utilizing a star tracking method;(3) the angular distances between other frames and the initial frame are compared, the angular distances are screened according to angular distance changes, and an angular distance screening matrix is updated; (4) star pairs corresponding to the screened angular distances are used to vote for each star point, and the star points with the excessively low vote numbers are screened; and (5) each frame is output by the screened star points and is sent to a subsequent star map recognition module. The method has the following advantages: (1) the convergence success rate is high, and the convergencesuccess rate is over 98% within 600 artificial stars; (2) the convergence speed is high, and all the artificial stars can be screened by only at most 10 frames of the star map on average; (3) the adaptability to the number of the artificial satellites is high, and all the artificial stars can be screened from the star map with no less than 700 artificial stars; and (4) the screening of the artificial stars does not depend on shape information of the star points.

Description

technical field [0001] The invention relates to star sensor technology in the field of celestial navigation, in particular to a false star screening method based on angular distance screening. Background technique [0002] The star sensor is an attitude measurement device widely used in satellites, missiles and other carriers. It has the advantages of high precision, strong autonomy, and no cumulative error. Star image recognition is one of the key technologies of the star sensor, which is to identify the star image collected by the camera and find out the corresponding relationship between the star points in the image and the star points in the star library. The robustness of star pattern recognition directly determines the reliability of the star sensor. [0003] When the working environment is relatively ideal, the current star sensor has been able to achieve long-term stable work. However, when the star sensor encounters the interference of close-range space objects su...

AI Technical Summary

Problems solved by technology

However, when the star sensor encounters the interference of close-range space objects such as plumes, a large number of false stars may appear in its field of view, and the number is usually up to dozens of times that of real stars, which seriously interferes with the process of star map identification, resulting in Pose failed

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