Star pattern recognition method based on radial triangle mapping matrix

A star map recognition and mapping matrix technology, applied in the field of star map recognition, can solve the problem that the radial algorithm cannot use the hoop information, etc., and achieves the effect of improving the efficiency of pattern query, avoiding slow search speed, and strong robustness.

Active Publication Date: 2021-10-08
BEIHANG UNIV
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Problems solved by technology

[0005] Aiming at the deficiency that the current radial algorithm cannot utilize the circumferential information, the present invention proposes a radial triangular pattern feature star map recognition algorithm based on the radial algorithm

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  • Star pattern recognition method based on radial triangle mapping matrix
  • Star pattern recognition method based on radial triangle mapping matrix
  • Star pattern recognition method based on radial triangle mapping matrix

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[0122] Initialization: Set a status flag for each navigation star in the navigation star list, and initialize it during the matching process. Create a 1×N for each observed star candi counter, look up the value of the index position in the radial triangle pattern library through the grid index obtained in step S120, and build a temporary lookup table at the same time to store the adjacent star label corresponding to the main star in the candidate radial triangle pattern.

[0123] In the radial triangular pattern matrix corresponding to each observation star generated in step S200, extract the index of the pattern matrix corresponding to the observation star at a non-zero position, and search the index value in the pattern matrix in step S100 for the index unit. By looking up the pattern library asterisk value corresponding Corresponding to the observation star Compare to determine whether this asterisk is a candidate asterisk.

[0124] The conditions for a successful ma...

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Abstract

A star pattern recognition method based on a radial triangle mapping matrix comprises the following steps of: extracting a radial triangle mode of a navigation star, and establishing a navigation star mode library; constructing a radial triangle formed by a main star as a vertex and any two adjacent stars in a mode radius according to the geometric distribution of observation stars extracted from a star pattern; mapping the angular distance of the radial triangle to a mode matrix; completing voting through matching of the grids of the mode matrix; selecting high-vote candidate stars as main star labels through voting; for individual low-vote and equal-vote candidate stars, determining a rotation matrix and an attitude angle by using double-loss attitude determination; and verifying the radial triangle through a reprojection method, and outputting an observation star verification identification result to obtain a star label. Other Nmax to-be-recognized stars close to the main point of the star pattern are recognized in the same way. According to the method, the robustness of a triangle algorithm is inherited, meanwhile, a pattern matrix with rotation invariance is constructed, the whole pattern library is searched during each radial triangular pattern matching voting, and completeness is achieved.

Description

technical field [0001] The invention relates to the field of star map recognition in star sensor celestial navigation, in particular to a star map recognition method based on a radial triangle mapping matrix. Background technique [0002] The star sensor is an important hardware component in the satellite attitude control system, which can obtain the three-axis attitude of the spacecraft through star map recognition. Because the star sensor measurement does not need to estimate prior knowledge, and the measurement accuracy can reach the arcsecond level, it has been widely used in star space exploration tasks. [0003] At present, the existing star map recognition algorithms are roughly divided into subgraph isomorphism algorithms and pattern algorithms according to different feature extraction methods. Subgraph isomorphism algorithms such as triangle algorithm, pyramid algorithm, etc. regard star points as vertices of the graph, and their edges correspond to the correspondi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/02
CPCG01C21/025Y02D10/00
Inventor 魏新国杜靖远王刚毅李健
Owner BEIHANG UNIV
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