Method for identifying triangular star map

A star map recognition and triangle technology, applied in the direction of integrated navigator, etc., can solve the problems of low recognition rate, redundant matching, poor noise robustness, etc., achieve good robustness, reduce redundant matching, and improve recognition rate Effect

Inactive Publication Date: 2011-05-25
BEIHANG UNIV
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Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the present invention proposes a triangle star map recognition method, which solves the problems of poor robustness to noise, many redundant matches, and low recognition rate existing in the traditional triangle star map recognition method

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Embodiment Construction

[0052] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0053] The present invention proposes a triangle star pattern recognition method, such as figure 1 As shown, it specifically includes the following steps:

[0054] Step 1: Create a navigation database:

[0055] (1) construct characteristic triangle;

[0056] In the basic star library, select any one of the stars as the main star, and within the radius r of the main star, select the two stars closest to the main star as the neighboring star A and the neighboring star B, where r satisfies br≤r≤pr, Among them, br is the minimum value of the radius range of the main star, pr is the maximum value of the radius range of the main star, and pr≤1.5r max , r max is the field radius of the star sensor, and the field angle of the star sensor is 12°×12°, then the field radius r of the star sensor max is 6°, then r is preferably 1.5°≤r≤9°, and the self-radius ...

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Abstract

The invention discloses a method for identifying a triangular star map, and belongs to the field of navigation, guidance and control of spacecraft. The method comprises the following steps of: 1, establishing a navigation database, namely constructing characteristic triangles, calculating a plane unit normal vector, solving an optimal projection principal axis and projection point values, and normalizing magnitude; 2, forming an observation triangle; and 3, searching a characteristic triangle which is most matched with the observation triangle from the navigation database, sequentially retrieving a projection point value block index stable, a characteristic triangle table and a magnitude normalizing table in a hierarchical retrieval mode, and finishing the matching of the observation triangle. The method for identifying the triangular star map solves the problems of low noise robustness, more redundant matching and low identification rate of the conventional method for identifying the triangular star map, obviously improves the search speed of the navigation database, reduces redundant matching, improves the identification rate, and has higher noise robustness.

Description

technical field [0001] The invention belongs to the field of spacecraft navigation, guidance and control, and in particular relates to a triangle star pattern recognition method. Background technique [0002] The star sensor is an important part of the astronomical navigation system. The star map recognition method is the core algorithm of the star sensor. Through the star map recognition, the attitude information of the carrier can be quickly and accurately obtained. The all-day autonomous star map recognition method with high accuracy has important theoretical and practical significance. [0003] As early as 1997, Padgett C et al. proposed the initial triangular star map identification method, using the three angular distances of the triangle for matching, the observation triangle is composed of any three stars in the field of view, according to the three angles of the observation triangle If the error corresponding to the three pairs of angular distances is within a set ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/24
Inventor 杨静伍玲玲
Owner BEIHANG UNIV
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