A method for selecting navigation stars based on the magnitude characteristics of star sensor cameras

By constructing the relationship between magnitude and star sensor camera, the navigation star library is determined. Adaptive star window extraction and binarization processing are used to solve the problem of ambiguous magnitude threshold in the navigation star table, thereby achieving accurate filtering of navigation star quantity and improving star map recognition speed.

CN116202513BActive Publication Date: 2026-04-24MINISTRY OF NATURAL RESOURCES LAND SATELLITE REMOTE SENSING APPL CENT
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Patent Information

Application Number
CN202310247685.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-03-15
Publication Date
2026-04-24
Estimated Expiration
2043-03-15

AI Technical Summary

Technical Problem

In existing navigation satellite selection methods, the selection of magnitude thresholds is ambiguous, resulting in high redundancy or missing information in the navigation satellite catalog, which affects the efficiency and accuracy of star map recognition.

Method used

By constructing the relationship between magnitude and star sensor camera, a navigation star library is determined. Adaptive star window extraction and binarization processing are used, combined with a magnitude-insensitive recognition algorithm, to construct a highly complete and low-redundancy navigation star catalog and select accurate magnitude thresholds.

Benefits of technology

It achieves precise selection of the number of navigation stars, reduces data transmission pressure, improves star map recognition speed and accuracy, and constructs a navigation star catalog with good uniformity.

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Abstract

This invention discloses a navigation star selection method based on the magnitude features of a star sensor camera, comprising: S1: obtaining a continuous scene star sensor imaging star map; S2: extracting background noise from the star map in S1 and performing star map denoising; S3: binarizing the denoised star map; S4: solving for 8-connected components using the binarized star map to create set A; S5: sorting set A. This method first establishes the relationship between the imaging characteristics of the star sensor camera and the magnitudes of stars, then uses this relationship to select a parent star catalog for magnitude filtering, and finally distributes the star catalog evenly according to the star sensor camera characteristics to form the final navigation star catalog. Compared with traditional navigation star catalog construction methods, this invention increases the correlation with the star sensor camera, and can be applied to different sensors. The navigation star catalog constructed by this invention has high completeness, low redundancy, and good uniformity.
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