Quick all-sky-domain star map recognition method and system robust to noisy points

Abstract

The invention discloses a quick all-sky-domain star map recognition method and system robust to noisy points. The star map recognition method comprises the following steps of: S1, selecting a to-be-recognized primary star in a star map; S2, constructing a neighbor satellite candidate set; S3, obtaining a preprocessed star map; S4, acquiring a distance mask mode of the preprocessed star map; S5, calculating initial similarity, and screening out candidate templates used for matching; S6, calculating the comprehensive similarity of the candidate templates; and S7, outputting a final identification result. According to the method, star map recognition is carried out, the problem that a large number of star points in a field of view are transformed out of the field of view after decentralization in a traditional method can be relieved, and the number of available fixed stars is increased; the problem of subsequent matching errors caused by high neighbor point selection error rate of a traditional method is relieved; meanwhile, the robustness of the method is very high under the condition that noisy points such as missing stars or pseudo stars exist; and in addition, non-iterative verification is adopted, and additional star point recognition does not need to be introduced for confirmation, so that the method is quicker and more effective.

Description

technical field [0001] The invention belongs to the technical field of star map recognition, and in particular relates to a fast all-sky star map recognition method robust to noise. Background technique [0002] The star sensor is the core component of the autonomous navigation of the spacecraft. It realizes high-precision attitude measurement by observing the stars in space. For astronomical navigation, a star can be regarded as an ideal point light source that is located at infinity, approximately stationary, and has certain spectral characteristics. If no previous attitude information is available, or if restarted after a failure, the star sensor will operate in "acquisition mode" for all-sky star pattern identification. The star sensor in capture mode first identifies the stars captured in the image, then calculates an attitude based on the position measurements of the identified stars (stored in the star catalog). At present, the work of calculating the attitude can b...

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a fast all-sky star map recognition method that is robust to noise, aiming to solve the technical problem that the recognition rate performance of existing similar methods is sensitive to noise

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