A method for constructing a navigation star library with approximate uniform distribution under a small field of view condition

By employing approximately uniformly distributed spherical spiral reference points and the Kernel SVM-SMO method under small field-of-view conditions, the problems of uneven distribution and redundancy in the navigation satellite library were solved, achieving uniformity and high brightness in the navigation satellite library, which is suitable for the construction of navigation satellite libraries for star sensors.

CN116340298BActive Publication Date: 2026-03-31INST OF OPTICS & ELECTRONICS CHINESE ACAD OF SCI
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Patent Information

Application Number
CN202211571155.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-12-08
Publication Date
2026-03-31
Estimated Expiration
2042-12-08

AI Technical Summary

Technical Problem

Under small field-of-view conditions, the navigation satellite library is unevenly distributed and there is redundancy of faint satellites. Traditional methods suffer from problems of gaps and redundancy matching.

Method used

The method employs a spherical spiral reference point based on approximately uniform distribution and a Kernel SVM-SMO approach. Low-magnitude navigation stars are eliminated using the VMT algorithm, a preliminary navigation star library is selected using the spiral reference point, and the final navigation star library is selected using the Kernel SVM-SMO classifier, thus avoiding gaps and redundancy.

Benefits of technology

It achieves a uniform distribution of navigation satellite libraries, reduces storage requirements, improves average brightness, and simplifies the construction process of navigation satellite libraries, making it suitable for practical engineering tasks.

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Abstract

The application discloses a kind of navigation star library construction methods of approximate uniform distribution under small field of view condition, comprising: (1) using VMT algorithm, set threshold to SAO star table is segmented, only keep following navigation star, store in star library StarLib;(2) in star library StarLib, eliminate the navigation star of brightness and position not fixed, star distance value is too small, that is, eliminate variable star and binary star, obtain basic star library (StarLib1);(3) using approximate uniform distribution of spherical spiral reference point, according to the angle distance between reference point and star, star, the combination characteristics of three star density to rough navigation star, obtain preliminary navigation star library (StarLib2) and alternative star library (StarLib3);(4) on the basis of StarLib2, using KernelSVM-SMO from nonlinear distribution StarLib3 star library, select navigation star, calculate the average value of angle distance between selected star and existing navigation star in current field of view, judge whether less than set threshold, to effectively avoid redundant star, obtain final navigation star library (StarLib4).
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