A False Star Screening Method for Star Sensor Based on Angular Distance Screening

Abstract

The invention discloses a method for screening out false stars of a star sensor based on angular distance screening. The steps are: (1) recording all star points in the first frame star map as initial star points; (2) starting from the second frame , use the star tracking method to establish the corresponding relationship between each star point and the initial star point; (3) compare the angular distance between each frame and the initial frame, screen the angular distance according to the angular distance change, and update the angular distance screening matrix; (4) ) Use the star pairs corresponding to the screened angular distances to vote for each star point, and filter out the star points with too low number of votes; (5) Output the filtered star points for each frame and send them to the subsequent star map recognition module. The present invention has the following advantages: (1) the success rate of convergence is high, within 600 false stars, the success rate of convergence is above 98%; (2) the convergence speed is fast, and it only needs no more than 10 frames of star maps on average to screen out all false stars. False stars; (3) The ability to adapt to the number of false stars is strong, and all false stars can be screened out from the star map of up to 700 false stars; (4) The screening of false stars does not depend on the shape information of 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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