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Star map recognition method, star map recognition apparatus and star map recognition system based on triangle matching

A star map recognition and triangle technology, which is applied in the field of aerospace navigation, can solve the problems of high probability of redundant matching, increased calculation amount, and limited number of verification stars.

Active Publication Date: 2018-04-13
BEIJING AEROSPACE INST OF THE LONG MARCH VEHICLE +1
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Problems solved by technology

[0008] 3) When the error threshold range is large, the probability of redundant matching using 3-point triangle matching is high
[0009] 4) If verification stars are added outside the triangle, the amount of calculation will increase significantly, limiting the number of verification stars

Method used

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  • Star map recognition method, star map recognition apparatus and star map recognition system based on triangle matching
  • Star map recognition method, star map recognition apparatus and star map recognition system based on triangle matching
  • Star map recognition method, star map recognition apparatus and star map recognition system based on triangle matching

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Embodiment

[0152] Aiming at the requirement of autonomous attitude determination of spacecraft, a star map recognition device based on triangle matching is developed. There is a one-to-one correspondence between the points and the asterisks in the star library, so that the right ascension and declination values ​​of each star point can be obtained for the subsequent attitude calculation system to perform attitude determination.

[0153] The camera field of view of the device is 15°×15°, the focal length is 18.8mm, the detector size is 496×496, the pixel size is 10μm, the detection noise ratio for 6th magnitude stars is 8, the lens distortion is less than 1%, and ε is 1.5 %. The specific process of using the device for star map recognition processing is as follows:

[0154] (1) In the suburb of Yanqing, Beijing, the camera is used to shoot the star map vertically to the starry sky, and the obtained star map is as follows: Figure 4 As shown in (a), in order to show the effect, the intensi...

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Abstract

The invention relates to a star map recognition method, a star map recognition apparatus and a star map recognition system based on triangle matching. According to the present invention, part of starpoints are selected from bright stars, and are recognized, and re-selection is performed if the recognition fails, such that the interference caused by pseudo stars in the star map can be eliminated;the matching is performed with the multiple star points, such that the redundant matching probability can be substantially reduced in the case of the high error margin; the traditional absolute errorthreshold is changed into the relative error threshold, such that the small angular distance is corresponding to the small error margin so as to increase the calculation speed; and the primary recognition on the star points is completed by comparing the star number, and the primary recognition result is verified by comparing the theoretical angular distance value calculated with right ascension and declination to the actual measurement value, such that the number of the searching of the star number according to the angular distance and the number of the star number comparing are reduced, and the total recognition speed is improved.

Description

technical field [0001] The invention belongs to the technical field of aerospace navigation and relates to the improvement of a star map recognition algorithm based on triangle features. Background technique [0002] The star sensor (star sensor) is an instrument that uses the captured star map to determine the attitude of the platform. Attitude measurement is the premise of space flight control, and it is of great significance to ensure the high-performance flight of spacecraft, high-precision observation and the smooth completion of various space tasks. [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 threshold range, the observation tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/02G01C21/20
CPCG01C21/02G01C21/20
Inventor 李建华张力牛振红李志峰束逸刘佳琪刘鑫刘洪艳高路杜润乐薛莲薛峰赵茜蔡雯琳
Owner BEIJING AEROSPACE INST OF THE LONG MARCH VEHICLE
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