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Identification method for triangular star atlas based on characteristic of inertia ratio

A triangular and inertia ratio technology, applied in the field of star map recognition, can solve the problems of increased storage space, rapid decline in recognition rate, and increased information volume, achieving the effects of reduced storage space, strong anti-interference ability, and guaranteed recognition rate

Active Publication Date: 2012-01-11
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as the field of view increases, the range of angular distances that need to be stored using this method will still increase sharply, resulting in a sharp increase in the amount of stored information, which will lead to a rapid increase in the storage space required for the star pair database in this method. increase; and, when the star point position noise standard deviation is greater than 1 pixel, the recognition rate will drop faster

Method used

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  • Identification method for triangular star atlas based on characteristic of inertia ratio
  • Identification method for triangular star atlas based on characteristic of inertia ratio
  • Identification method for triangular star atlas based on characteristic of inertia ratio

Examples

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Embodiment 1

[0118] In the present embodiment, the method of the present invention has been adopted to construct and store the navigation feature library comprising the centroid-inertia ratio of the navigation triangle and the angular distance value of a side of the navigation triangle, and a navigation database has been generated; The value is 6, the value of Q is 4, the value of A is 0.002, and the value of B is 0.0004. The method for matching identification in this embodiment, such as Figure 5 shown, including the following steps:

[0119] Step 501: After the star is observed, judge whether the number of observed stars in the field of view is greater than 6, if yes, execute step 502, otherwise, execute step 504;

[0120] Step 502: further judge whether all the stars in the field of view have been processed, if yes, execute step 510, otherwise, execute step 503;

[0121] Here, judging whether all the stars in the field of view have been processed means that all the stars in the field ...

Embodiment 2

[0137] In this embodiment, the Monte Carlo method is used to generate 1000 simulated star maps, and a simulation experiment is carried out through the influence of star point position noise and magnitude noise on recognition. Table 1 gives the parameters of the simulation experiment.

[0138] Table 1

[0139]

[0140]

[0141] In order to investigate the anti-interference ability of the star map recognition method provided by the present invention to the star point position noise, the star point position in the star map is now added with Gaussian noise whose mean value is 0, and the standard deviation σ varies from 0 to 2 pixels, and the recognition result Such as Image 6 shown. from Image 6 It can be seen from the figure that when the standard deviation σ of star point position noise is equal to 2 pixels, the recognition rate can reach more than 99% by adopting the method provided by the present invention. This shows that the method provided by the present inventi...

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Abstract

The invention discloses an identification method for a triangular star atlas based on the characteristics of inertia ratio. The method comprises the following steps: constructing and storing a navigational feature library containing centroid inertia ratio of navigational triangles and angular distance of one side of the navigational triangles; determining triangles to be observed according to theamount of stars to be observed in a field of view, and determining centroid inertia ratio of all the triangles to be observed and angular distance of sides of the triangles that have same attribute as the sides stored in the navigational feature library; matching the centroid inertia ratio and angular distance of the sides of all the triangles to be observed determined in the previous step with the centroid inertia ratio and angular distance of the sides in the navigational feature library, and determining navigational triangles matching with the triangles to be observed; establishing a referential star atlas based on the matched navigational triangles, and carrying out star and point matching on the referential star atlas and a star atlas to be observed so as to complete the process of identification. The method provided in the invention can reduce storage space as well as improve the speed of matching.

Description

technical field [0001] The invention relates to a star chart recognition technology, in particular to a triangular star chart recognition method based on an inertia ratio feature. Background technique [0002] As a spacecraft attitude measurement instrument, the star sensor has been widely used in the aerospace field due to its advantages of strong autonomy, no error accumulation, and high precision, and the star map recognition is the key to the star sensor to complete the spacecraft attitude measurement One of the techniques. [0003] The triangular star pattern recognition method is a relatively mature all-day autonomous star pattern recognition method. The basic principle of the triangle star map identification method is: select three observation stars in the observation star map to form a triangle, use the angular distance between two observation stars as the matching feature quantity, and find the closest triangle in the navigation star database for matching identify...

Claims

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Application Information

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IPC IPC(8): G01C21/24
Inventor 魏新国陆壮志江洁李健
Owner BEIHANG UNIV
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