Star sensor anti-stray light star point extraction method and device based on iterative traversal

A star point extraction and star sensor technology, applied in the field of satellite attitude control, can solve the problem of inability to quickly output an effective attitude, and achieve the effects of improving on-orbit stray light resistance, improving recognition probability, and reducing pseudo-star interference.

Active Publication Date: 2021-10-22
BEIJING INST OF CONTROL ENG
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  • Description
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Problems solved by technology

[0010] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, and to propose a method and device for extracting star points against stray light based on iterative traversal, which effectively solves the problem that the product cannot quickly output an effective attitude when it is disturbed by stray light in orbit. problem, significantly improved the ability of the star sensor to resist stray light in orbit

Method used

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  • Star sensor anti-stray light star point extraction method and device based on iterative traversal
  • Star sensor anti-stray light star point extraction method and device based on iterative traversal
  • Star sensor anti-stray light star point extraction method and device based on iterative traversal

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Embodiment

[0078] Such as figure 2 Shown:

[0079] 1) Set the image processing frame number N frame The initial value is 0, the image time t i The initial value of the subscript number i is 0, select the number of stars N star The initial value is 0, and the number of windows is randomly generated N window is 10, and the window size is 36×36;

[0080] 2) At time t0, randomly generate 10 effective window center coordinates UV_rand, corresponding to effective window center coordinates UV_center=UV_rand at time t0;

[0081] 3) According to 10 window center coordinates UV_center and window size 36×36, window the image at time t0;

[0082] 4) Calculate the mean value and threshold value of the image background of 10 windows respectively. Take the i-th window as an example, i=1, 2, 3,...,10, and calculate the corresponding window according to the pixel grayscale of 6 rows × 6 columns at the edge of the i-th window The image gray mean Mean windowi and image standard deviation Std windo...

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Abstract

The invention discloses a star sensor anti-stray light star point extraction method and device based on iterative traversal, and the method comprises the steps: randomly generating N windows in a whole image, respectively calculating a mean value and a threshold value of each window, and carrying out the star point extraction in the windows through employing the calculated window threshold values in a manner of traversing a connected domain; calculating star point position coordinates by using a first-order centroid method, and storing energy information of each star point; sorting the extracted effective star points according to energy, retaining coordinates of n brightest star points, and randomly generating N-n window coordinates at the same time; using the reserved n star point coordinates and the randomly generated window coordinates for windowing the next frame of star map; and iteratively executing the steps, extracting the brightest star points of the Nstar in the star map after multiple traversal, and performing subsequent all-sky star map recognition and attitude calculation by using the Nstar points. The invention effectively solves the problem that the product cannot quickly output the effective attitude due to the interference of stray light in orbit, and obviously improves the in-orbit stray light resistance of the star sensor.

Description

technical field [0001] The invention belongs to the technical field of satellite attitude control, and relates to an iterative traversal-based star sensor anti-stray light star point extraction method and device. Background technique [0002] The star sensor obtains the star observation vector by imaging the stars in space, uses the star map matching method to determine the direction of the star sensor optical axis in the inertial space, and uses the conversion relationship between the star sensor body coordinate system and the satellite attitude coordinate system to determine the satellite attitude. [0003] The star point extraction algorithm is the basis for the star sensor to achieve high-precision attitude measurement accuracy, and it is also one of the time-consuming parts of the current star-sensing software processing process. The star point positioning accuracy directly affects the success probability of star map recognition and the effectiveness of attitude calcula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/24
CPCG01C21/24
Inventor 程会艳郑然武延鹏张腾飞隋杰李玉明王苗苗张洪健关健夏梦绮
Owner BEIJING INST OF CONTROL ENG
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